[PATCH 00/15] block: third batch of add_disk() error handling conversions

[PATCH 00/15] block: third batch of add_disk() error handling conversions

[Luis Chamberlain]

This is the third set of block drivers add_disk() error handling
patches. It's a bit bigger set than the first two sets given the
pcd/pf/pd drivers could use some love before the conversions.

Please let me know if you spot any issues.

The full set of changes can be found on my branch titled
20210830-for-axboe-add-disk-error-handling-v2 [0].

[0] https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/log/?h=20210830-for-axboe-add-disk-error-handling-v2

Christoph Hellwig (4):
  pcd: move the identify buffer into pcd_identify
  pcd: cleanup initialization
  pf: cleanup initialization
  pd: cleanup initialization

Luis Chamberlain (11):
  z2ram: add error handling support for add_disk()
  aoe: add error handling support for add_disk()
  m68k/emu/nfblock: add error handling support for add_disk()
  drbd: add error handling support for add_disk()
  um/drivers/ubd_kern: add error handling support for add_disk()
  xtensa/platforms/iss/simdisk: add error handling support for
    add_disk()
  n64cart: add error handling support for add_disk()
  pcd: add error handling support for add_disk()
  pcd: fix ordering of unregister_cdrom()
  pcd: capture errors on cdrom_register()
  pd: add error handling support for add_disk()

 arch/m68k/emu/nfblock.c             |   9 +-
 arch/um/drivers/ubd_kern.c          |  13 +-
 arch/xtensa/platforms/iss/simdisk.c |  13 +-
 drivers/block/aoe/aoeblk.c          |   6 +-
 drivers/block/drbd/drbd_main.c      |   6 +-
 drivers/block/n64cart.c             |  12 +-
 drivers/block/paride/pcd.c          | 304 +++++++++++++---------------
 drivers/block/paride/pd.c           | 146 ++++++-------
 drivers/block/paride/pf.c           | 223 +++++++++-----------
 drivers/block/z2ram.c               |   7 +-
 10 files changed, 365 insertions(+), 374 deletions(-)

-- 
2.30.2

[PATCH 01/15] z2ram: add error handling support for add_disk()

[Luis Chamberlain]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling. Only the disk is cleaned up inside
z2ram_register_disk() as the caller deals with the rest.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 drivers/block/z2ram.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index 4eef218108c6..6648bbc87c30 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -318,6 +318,7 @@ static const struct blk_mq_ops z2_mq_ops = {
 static int z2ram_register_disk(int minor)
 {
 	struct gendisk *disk;
+	int err;
 
 	disk = blk_mq_alloc_disk(&tag_set, NULL);
 	if (IS_ERR(disk))
@@ -333,8 +334,10 @@ static int z2ram_register_disk(int minor)
 		sprintf(disk->disk_name, "z2ram");
 
 	z2ram_gendisk[minor] = disk;
-	add_disk(disk);
-	return 0;
+	err = add_disk(disk);
+	if (err)
+		blk_cleaup_disk(disk);
+	return err;
 }
 
 static int __init z2_init(void)
-- 
2.30.2

[PATCH 02/15] aoe: add error handling support for add_disk()

[Luis Chamberlain]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 drivers/block/aoe/aoeblk.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 06b360f7123a..e436b0e8eff5 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -417,7 +417,9 @@ aoeblk_gdalloc(void *vp)
 
 	spin_unlock_irqrestore(&d->lock, flags);
 
-	device_add_disk(NULL, gd, aoe_attr_groups);
+	err = device_add_disk(NULL, gd, aoe_attr_groups);
+	if (err)
+		goto out_disk_cleanup;
 	aoedisk_add_debugfs(d);
 
 	spin_lock_irqsave(&d->lock, flags);
@@ -426,6 +428,8 @@ aoeblk_gdalloc(void *vp)
 	spin_unlock_irqrestore(&d->lock, flags);
 	return;
 
+out_disk_cleanup:
+	blk_cleanup_disk(gd);
 err_tagset:
 	blk_mq_free_tag_set(set);
 err_mempool:
-- 
2.30.2

[PATCH 03/15] m68k/emu/nfblock: add error handling support for add_disk()

[Luis Chamberlain]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 arch/m68k/emu/nfblock.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/m68k/emu/nfblock.c b/arch/m68k/emu/nfblock.c
index 9a8394e96388..4de5a6087034 100644
--- a/arch/m68k/emu/nfblock.c
+++ b/arch/m68k/emu/nfblock.c
@@ -100,6 +100,7 @@ static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
 {
 	struct nfhd_device *dev;
 	int dev_id = id - NFHD_DEV_OFFSET;
+	int err = -ENOMEM;
 
 	pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
 		blocks, bsize);
@@ -130,16 +131,20 @@ static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
 	sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
 	set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
 	blk_queue_logical_block_size(dev->disk->queue, bsize);
-	add_disk(dev->disk);
+	err = add_disk(dev->disk);
+	if (err)
+		goto out_cleanup_disk;
 
 	list_add_tail(&dev->list, &nfhd_list);
 
 	return 0;
 
+out_cleanup_disk:
+	blk_cleanup_disk(dev->disk);
 free_dev:
 	kfree(dev);
 out:
-	return -ENOMEM;
+	return err;
 }
 
 static int __init nfhd_init(void)
-- 
2.30.2

[PATCH 04/15] drbd: add error handling support for add_disk()

[Luis Chamberlain]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 drivers/block/drbd/drbd_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 55234a558e98..19db80a1e409 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2794,7 +2794,9 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
 		goto out_idr_remove_vol;
 	}
 
-	add_disk(disk);
+	err = add_disk(disk);
+	if (err)
+		goto out_cleanup_disk;
 
 	/* inherit the connection state */
 	device->state.conn = first_connection(resource)->cstate;
@@ -2808,6 +2810,8 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
 	drbd_debugfs_device_add(device);
 	return NO_ERROR;
 
+out_cleanup_disk:
+	blk_cleanup_disk(disk);
 out_idr_remove_vol:
 	idr_remove(&connection->peer_devices, vnr);
 out_idr_remove_from_resource:
-- 
2.30.2

[PATCH 05/15] um/drivers/ubd_kern: add error handling support for add_disk()

[Luis Chamberlain]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

ubd_disk_register() never returned an error, so just fix
that now and let the caller handle the error condition.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 arch/um/drivers/ubd_kern.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index cd9dc0556e91..81045c199c30 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -854,8 +854,8 @@ static const struct attribute_group *ubd_attr_groups[] = {
 	NULL,
 };
 
-static void ubd_disk_register(int major, u64 size, int unit,
-			      struct gendisk *disk)
+static int ubd_disk_register(int major, u64 size, int unit,
+			     struct gendisk *disk)
 {
 	disk->major = major;
 	disk->first_minor = unit << UBD_SHIFT;
@@ -872,7 +872,7 @@ static void ubd_disk_register(int major, u64 size, int unit,
 
 	disk->private_data = &ubd_devs[unit];
 	disk->queue = ubd_devs[unit].queue;
-	device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups);
+	return device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups);
 }
 
 #define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE))
@@ -919,10 +919,15 @@ static int ubd_add(int n, char **error_out)
 	blk_queue_write_cache(ubd_dev->queue, true, false);
 	blk_queue_max_segments(ubd_dev->queue, MAX_SG);
 	blk_queue_segment_boundary(ubd_dev->queue, PAGE_SIZE - 1);
-	ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, disk);
+	err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, disk);
+	if (err)
+		goto out_cleanup_disk;
+
 	ubd_gendisk[n] = disk;
 	return 0;
 
+out_cleanup_disk:
+	blk_cleanup_disk(disk);
 out_cleanup_tags:
 	blk_mq_free_tag_set(&ubd_dev->tag_set);
 out:
-- 
2.30.2

[PATCH 06/15] xtensa/platforms/iss/simdisk: add error handling support for add_disk()

[Luis Chamberlain]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 arch/xtensa/platforms/iss/simdisk.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/xtensa/platforms/iss/simdisk.c b/arch/xtensa/platforms/iss/simdisk.c
index 3cdfa00738e0..ad85c554cd45 100644
--- a/arch/xtensa/platforms/iss/simdisk.c
+++ b/arch/xtensa/platforms/iss/simdisk.c
@@ -259,6 +259,7 @@ static int __init simdisk_setup(struct simdisk *dev, int which,
 		struct proc_dir_entry *procdir)
 {
 	char tmp[2] = { '0' + which, 0 };
+	int err = -ENOMEM;
 
 	dev->fd = -1;
 	dev->filename = NULL;
@@ -267,7 +268,7 @@ static int __init simdisk_setup(struct simdisk *dev, int which,
 
 	dev->gd = blk_alloc_disk(NUMA_NO_NODE);
 	if (!dev->gd)
-		return -ENOMEM;
+		goto out;
 	dev->gd->major = simdisk_major;
 	dev->gd->first_minor = which;
 	dev->gd->minors = SIMDISK_MINORS;
@@ -275,10 +276,18 @@ static int __init simdisk_setup(struct simdisk *dev, int which,
 	dev->gd->private_data = dev;
 	snprintf(dev->gd->disk_name, 32, "simdisk%d", which);
 	set_capacity(dev->gd, 0);
-	add_disk(dev->gd);
+	err = add_disk(dev->gd);
+	if (err)
+		goto out_cleanup_disk;
 
 	dev->procfile = proc_create_data(tmp, 0644, procdir, &simdisk_proc_ops, dev);
+
 	return 0;
+
+out_cleanup_disk:
+	blk_cleanup_disk(dev->gd);
+out:
+	return err;
 }
 
 static int __init simdisk_init(void)
-- 
2.30.2

[PATCH 07/15] n64cart: add error handling support for add_disk()

[Luis Chamberlain]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 drivers/block/n64cart.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/block/n64cart.c b/drivers/block/n64cart.c
index c84be0028f63..1ba9137bdf30 100644
--- a/drivers/block/n64cart.c
+++ b/drivers/block/n64cart.c
@@ -117,6 +117,7 @@ static const struct block_device_operations n64cart_fops = {
 static int __init n64cart_probe(struct platform_device *pdev)
 {
 	struct gendisk *disk;
+	int err = -ENOMEM;
 
 	if (!start || !size) {
 		pr_err("start or size not specified\n");
@@ -134,7 +135,7 @@ static int __init n64cart_probe(struct platform_device *pdev)
 
 	disk = blk_alloc_disk(NUMA_NO_NODE);
 	if (!disk)
-		return -ENOMEM;
+		goto out;
 
 	disk->first_minor = 0;
 	disk->flags = GENHD_FL_NO_PART_SCAN;
@@ -149,11 +150,18 @@ static int __init n64cart_probe(struct platform_device *pdev)
 	blk_queue_physical_block_size(disk->queue, 4096);
 	blk_queue_logical_block_size(disk->queue, 4096);
 
-	add_disk(disk);
+	err = add_disk(disk);
+	if (err)
+		goto out_cleanup_disk;
 
 	pr_info("n64cart: %u kb disk\n", size / 1024);
 
 	return 0;
+
+out_cleanup_disk:
+	blk_cleanup_disk(disk);
+out:
+	return err;
 }
 
 static struct platform_driver n64cart_driver = {
-- 
2.30.2

[PATCH 08/15] pcd: move the identify buffer into pcd_identify

[Luis Chamberlain]

From: Christoph Hellwig <hch@lst.de>

No need to pass it through a bunch of functions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/block/paride/pcd.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index f9cdd11f02f5..8903fdaa2046 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -630,10 +630,11 @@ static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr)
 	return CDS_DISC_OK;
 }
 
-static int pcd_identify(struct pcd_unit *cd, char *id)
+static int pcd_identify(struct pcd_unit *cd)
 {
-	int k, s;
 	char id_cmd[12] = { 0x12, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
+	char id[18];
+	int k, s;
 
 	pcd_bufblk = -1;
 
@@ -664,15 +665,15 @@ static int pcd_identify(struct pcd_unit *cd, char *id)
  * returns  0, with id set if drive is detected
  *	    -1, if drive detection failed
  */
-static int pcd_probe(struct pcd_unit *cd, int ms, char *id)
+static int pcd_probe(struct pcd_unit *cd, int ms)
 {
 	if (ms == -1) {
 		for (cd->drive = 0; cd->drive <= 1; cd->drive++)
-			if (!pcd_reset(cd) && !pcd_identify(cd, id))
+			if (!pcd_reset(cd) && !pcd_identify(cd))
 				return 0;
 	} else {
 		cd->drive = ms;
-		if (!pcd_reset(cd) && !pcd_identify(cd, id))
+		if (!pcd_reset(cd) && !pcd_identify(cd))
 			return 0;
 	}
 	return -1;
@@ -709,7 +710,6 @@ static void pcd_probe_capabilities(void)
 
 static int pcd_detect(void)
 {
-	char id[18];
 	int k, unit;
 	struct pcd_unit *cd;
 
@@ -727,7 +727,7 @@ static int pcd_detect(void)
 		cd = pcd;
 		if (cd->disk && pi_init(cd->pi, 1, -1, -1, -1, -1, -1,
 			    pcd_buffer, PI_PCD, verbose, cd->name)) {
-			if (!pcd_probe(cd, -1, id)) {
+			if (!pcd_probe(cd, -1)) {
 				cd->present = 1;
 				k++;
 			} else
@@ -744,7 +744,7 @@ static int pcd_detect(void)
 				     conf[D_UNI], conf[D_PRO], conf[D_DLY],
 				     pcd_buffer, PI_PCD, verbose, cd->name)) 
 				continue;
-			if (!pcd_probe(cd, conf[D_SLV], id)) {
+			if (!pcd_probe(cd, conf[D_SLV])) {
 				cd->present = 1;
 				k++;
 			} else
-- 
2.30.2

[PATCH 09/15] pcd: cleanup initialization

[Luis Chamberlain]

From: Christoph Hellwig <hch@lst.de>

Refactor the pcd initialization to have a dedicated helper to initialize
a single disk.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/block/paride/pcd.c | 286 ++++++++++++++++---------------------
 1 file changed, 127 insertions(+), 159 deletions(-)

diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 8903fdaa2046..93ed63626232 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -183,8 +183,6 @@ static int pcd_audio_ioctl(struct cdrom_device_info *cdi,
 static int pcd_packet(struct cdrom_device_info *cdi,
 		      struct packet_command *cgc);
 
-static int pcd_detect(void);
-static void pcd_probe_capabilities(void);
 static void do_pcd_read_drq(void);
 static blk_status_t pcd_queue_rq(struct blk_mq_hw_ctx *hctx,
 				 const struct blk_mq_queue_data *bd);
@@ -302,53 +300,6 @@ static const struct blk_mq_ops pcd_mq_ops = {
 	.queue_rq	= pcd_queue_rq,
 };
 
-static void pcd_init_units(void)
-{
-	struct pcd_unit *cd;
-	int unit;
-
-	pcd_drive_count = 0;
-	for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
-		struct gendisk *disk;
-
-		if (blk_mq_alloc_sq_tag_set(&cd->tag_set, &pcd_mq_ops, 1,
-				BLK_MQ_F_SHOULD_MERGE))
-			continue;
-
-		disk = blk_mq_alloc_disk(&cd->tag_set, cd);
-		if (IS_ERR(disk)) {
-			blk_mq_free_tag_set(&cd->tag_set);
-			continue;
-		}
-
-		INIT_LIST_HEAD(&cd->rq_list);
-		blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
-		cd->disk = disk;
-		cd->pi = &cd->pia;
-		cd->present = 0;
-		cd->last_sense = 0;
-		cd->changed = 1;
-		cd->drive = (*drives[unit])[D_SLV];
-		if ((*drives[unit])[D_PRT])
-			pcd_drive_count++;
-
-		cd->name = &cd->info.name[0];
-		snprintf(cd->name, sizeof(cd->info.name), "%s%d", name, unit);
-		cd->info.ops = &pcd_dops;
-		cd->info.handle = cd;
-		cd->info.speed = 0;
-		cd->info.capacity = 1;
-		cd->info.mask = 0;
-		disk->major = major;
-		disk->first_minor = unit;
-		disk->minors = 1;
-		strcpy(disk->disk_name, cd->name);	/* umm... */
-		disk->fops = &pcd_bdops;
-		disk->flags = GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
-		disk->events = DISK_EVENT_MEDIA_CHANGE;
-	}
-}
-
 static int pcd_open(struct cdrom_device_info *cdi, int purpose)
 {
 	struct pcd_unit *cd = cdi->handle;
@@ -679,90 +630,31 @@ static int pcd_probe(struct pcd_unit *cd, int ms)
 	return -1;
 }
 
-static void pcd_probe_capabilities(void)
+static int pcd_probe_capabilities(struct pcd_unit *cd)
 {
-	int unit, r;
-	char buffer[32];
 	char cmd[12] = { 0x5a, 1 << 3, 0x2a, 0, 0, 0, 0, 18, 0, 0, 0, 0 };
-	struct pcd_unit *cd;
-
-	for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
-		if (!cd->present)
-			continue;
-		r = pcd_atapi(cd, cmd, 18, buffer, "mode sense capabilities");
-		if (r)
-			continue;
-		/* we should now have the cap page */
-		if ((buffer[11] & 1) == 0)
-			cd->info.mask |= CDC_CD_R;
-		if ((buffer[11] & 2) == 0)
-			cd->info.mask |= CDC_CD_RW;
-		if ((buffer[12] & 1) == 0)
-			cd->info.mask |= CDC_PLAY_AUDIO;
-		if ((buffer[14] & 1) == 0)
-			cd->info.mask |= CDC_LOCK;
-		if ((buffer[14] & 8) == 0)
-			cd->info.mask |= CDC_OPEN_TRAY;
-		if ((buffer[14] >> 6) == 0)
-			cd->info.mask |= CDC_CLOSE_TRAY;
-	}
-}
-
-static int pcd_detect(void)
-{
-	int k, unit;
-	struct pcd_unit *cd;
-
-	printk("%s: %s version %s, major %d, nice %d\n",
-	       name, name, PCD_VERSION, major, nice);
+	char buffer[32];
+	int ret;
 
-	par_drv = pi_register_driver(name);
-	if (!par_drv) {
-		pr_err("failed to register %s driver\n", name);
-		return -1;
-	}
+	ret = pcd_atapi(cd, cmd, 18, buffer, "mode sense capabilities");
+	if (ret)
+		return ret;
+
+	/* we should now have the cap page */
+	if ((buffer[11] & 1) == 0)
+		cd->info.mask |= CDC_CD_R;
+	if ((buffer[11] & 2) == 0)
+		cd->info.mask |= CDC_CD_RW;
+	if ((buffer[12] & 1) == 0)
+		cd->info.mask |= CDC_PLAY_AUDIO;
+	if ((buffer[14] & 1) == 0)
+		cd->info.mask |= CDC_LOCK;
+	if ((buffer[14] & 8) == 0)
+		cd->info.mask |= CDC_OPEN_TRAY;
+	if ((buffer[14] >> 6) == 0)
+		cd->info.mask |= CDC_CLOSE_TRAY;
 
-	k = 0;
-	if (pcd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
-		cd = pcd;
-		if (cd->disk && pi_init(cd->pi, 1, -1, -1, -1, -1, -1,
-			    pcd_buffer, PI_PCD, verbose, cd->name)) {
-			if (!pcd_probe(cd, -1)) {
-				cd->present = 1;
-				k++;
-			} else
-				pi_release(cd->pi);
-		}
-	} else {
-		for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
-			int *conf = *drives[unit];
-			if (!conf[D_PRT])
-				continue;
-			if (!cd->disk)
-				continue;
-			if (!pi_init(cd->pi, 0, conf[D_PRT], conf[D_MOD],
-				     conf[D_UNI], conf[D_PRO], conf[D_DLY],
-				     pcd_buffer, PI_PCD, verbose, cd->name)) 
-				continue;
-			if (!pcd_probe(cd, conf[D_SLV])) {
-				cd->present = 1;
-				k++;
-			} else
-				pi_release(cd->pi);
-		}
-	}
-	if (k)
-		return 0;
-
-	printk("%s: No CD-ROM drive found\n", name);
-	for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
-		if (!cd->disk)
-			continue;
-		blk_cleanup_disk(cd->disk);
-		blk_mq_free_tag_set(&cd->tag_set);
-	}
-	pi_unregister_driver(par_drv);
-	return -1;
+	return 0;
 }
 
 /* I/O request processing */
@@ -999,43 +891,121 @@ static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
 	return 0;
 }
 
+static int pcd_init_unit(struct pcd_unit *cd, bool autoprobe, int port,
+		int mode, int unit, int protocol, int delay, int ms)
+{
+	struct gendisk *disk;
+	int ret;
+
+	ret = blk_mq_alloc_sq_tag_set(&cd->tag_set, &pcd_mq_ops, 1,
+				      BLK_MQ_F_SHOULD_MERGE);
+	if (ret)
+		return ret;
+
+	disk = blk_mq_alloc_disk(&cd->tag_set, cd);
+	if (IS_ERR(disk)) {
+		ret = PTR_ERR(disk);
+		goto out_free_tag_set;
+	}
+
+	INIT_LIST_HEAD(&cd->rq_list);
+	blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
+	cd->disk = disk;
+	cd->pi = &cd->pia;
+	cd->present = 0;
+	cd->last_sense = 0;
+	cd->changed = 1;
+	cd->drive = (*drives[cd - pcd])[D_SLV];
+
+	cd->name = &cd->info.name[0];
+	snprintf(cd->name, sizeof(cd->info.name), "%s%d", name, unit);
+	cd->info.ops = &pcd_dops;
+	cd->info.handle = cd;
+	cd->info.speed = 0;
+	cd->info.capacity = 1;
+	cd->info.mask = 0;
+	disk->major = major;
+	disk->first_minor = unit;
+	disk->minors = 1;
+	strcpy(disk->disk_name, cd->name);	/* umm... */
+	disk->fops = &pcd_bdops;
+	disk->flags = GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
+	disk->events = DISK_EVENT_MEDIA_CHANGE;
+
+	if (!pi_init(cd->pi, autoprobe, port, mode, unit, protocol, delay,
+			pcd_buffer, PI_PCD, verbose, cd->name))
+		goto out_free_disk;
+	if (pcd_probe(cd, ms))
+		goto out_pi_release;
+
+	cd->present = 1;
+	pcd_probe_capabilities(cd);
+	register_cdrom(cd->disk, &cd->info);
+	add_disk(cd->disk);
+	return 0;
+
+out_pi_release:
+	pi_release(cd->pi);
+out_free_disk:
+	blk_cleanup_disk(cd->disk);
+out_free_tag_set:
+	blk_mq_free_tag_set(&cd->tag_set);
+	return ret;
+}
+
 static int __init pcd_init(void)
 {
-	struct pcd_unit *cd;
-	int unit;
+	int found = 0, unit;
 
 	if (disable)
 		return -EINVAL;
 
-	pcd_init_units();
+	if (register_blkdev(major, name))
+		return -EBUSY;
 
-	if (pcd_detect())
-		return -ENODEV;
+	pr_info("%s: %s version %s, major %d, nice %d\n",
+		name, name, PCD_VERSION, major, nice);
 
-	/* get the atapi capabilities page */
-	pcd_probe_capabilities();
+	par_drv = pi_register_driver(name);
+	if (!par_drv) {
+		pr_err("failed to register %s driver\n", name);
+		goto out_unregister_blkdev;
+	}
 
-	if (register_blkdev(major, name)) {
-		for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
-			if (!cd->disk)
-				continue;
+	for (unit = 0; unit < PCD_UNITS; unit++) {
+		if ((*drives[unit])[D_PRT])
+			pcd_drive_count++;
+	}
 
-			blk_cleanup_queue(cd->disk->queue);
-			blk_mq_free_tag_set(&cd->tag_set);
-			put_disk(cd->disk);
+	if (pcd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
+		if (!pcd_init_unit(pcd, 1, -1, -1, -1, -1, -1, -1))
+			found++;
+	} else {
+		for (unit = 0; unit < PCD_UNITS; unit++) {
+			struct pcd_unit *cd = &pcd[unit];
+			int *conf = *drives[unit];
+
+			if (!conf[D_PRT])
+				continue;
+			if (!pcd_init_unit(cd, 0, conf[D_PRT], conf[D_MOD],
+					conf[D_UNI], conf[D_PRO], conf[D_DLY],
+					conf[D_SLV]))
+				found++;
 		}
-		return -EBUSY;
 	}
 
-	for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
-		if (cd->present) {
-			register_cdrom(cd->disk, &cd->info);
-			cd->disk->private_data = cd;
-			add_disk(cd->disk);
-		}
+	if (!found) {
+		pr_info("%s: No CD-ROM drive found\n", name);
+		goto out_unregister_pi_driver;
 	}
 
 	return 0;
+
+out_unregister_pi_driver:
+	pi_unregister_driver(par_drv);
+out_unregister_blkdev:
+	unregister_blkdev(major, name);
+	return -ENODEV;
 }
 
 static void __exit pcd_exit(void)
@@ -1044,20 +1014,18 @@ static void __exit pcd_exit(void)
 	int unit;
 
 	for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
-		if (!cd->disk)
+		if (!cd->present)
 			continue;
 
-		if (cd->present) {
-			del_gendisk(cd->disk);
-			pi_release(cd->pi);
-			unregister_cdrom(&cd->info);
-		}
-		blk_cleanup_queue(cd->disk->queue);
+		del_gendisk(cd->disk);
+		pi_release(cd->pi);
+		unregister_cdrom(&cd->info);
+		blk_cleanup_disk(cd->disk);
+
 		blk_mq_free_tag_set(&cd->tag_set);
-		put_disk(cd->disk);
 	}
-	unregister_blkdev(major, name);
 	pi_unregister_driver(par_drv);
+	unregister_blkdev(major, name);
 }
 
 MODULE_LICENSE("GPL");
-- 
2.30.2

[PATCH 10/15] pf: cleanup initialization

[Luis Chamberlain]

From: Christoph Hellwig <hch@lst.de>

Refactor the pf initialization to have a dedicated helper to initialize
a single disk.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/block/paride/pf.c | 223 +++++++++++++++++---------------------
 1 file changed, 99 insertions(+), 124 deletions(-)

diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index d5b9c88ba76f..f471d48a87bc 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -214,7 +214,6 @@ static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 
 static void pf_release(struct gendisk *disk, fmode_t mode);
 
-static int pf_detect(void);
 static void do_pf_read(void);
 static void do_pf_read_start(void);
 static void do_pf_write(void);
@@ -285,45 +284,6 @@ static const struct blk_mq_ops pf_mq_ops = {
 	.queue_rq	= pf_queue_rq,
 };
 
-static void __init pf_init_units(void)
-{
-	struct pf_unit *pf;
-	int unit;
-
-	pf_drive_count = 0;
-	for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) {
-		struct gendisk *disk;
-
-		if (blk_mq_alloc_sq_tag_set(&pf->tag_set, &pf_mq_ops, 1,
-				BLK_MQ_F_SHOULD_MERGE))
-			continue;
-
-		disk = blk_mq_alloc_disk(&pf->tag_set, pf);
-		if (IS_ERR(disk)) {
-			blk_mq_free_tag_set(&pf->tag_set);
-			continue;
-		}
-
-		INIT_LIST_HEAD(&pf->rq_list);
-		blk_queue_max_segments(disk->queue, cluster);
-		blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
-		pf->disk = disk;
-		pf->pi = &pf->pia;
-		pf->media_status = PF_NM;
-		pf->drive = (*drives[unit])[D_SLV];
-		pf->lun = (*drives[unit])[D_LUN];
-		snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit);
-		disk->major = major;
-		disk->first_minor = unit;
-		disk->minors = 1;
-		strcpy(disk->disk_name, pf->name);
-		disk->fops = &pf_fops;
-		disk->events = DISK_EVENT_MEDIA_CHANGE;
-		if (!(*drives[unit])[D_PRT])
-			pf_drive_count++;
-	}
-}
-
 static int pf_open(struct block_device *bdev, fmode_t mode)
 {
 	struct pf_unit *pf = bdev->bd_disk->private_data;
@@ -718,59 +678,6 @@ static int pf_probe(struct pf_unit *pf)
 	return -1;
 }
 
-static int pf_detect(void)
-{
-	struct pf_unit *pf = units;
-	int k, unit;
-
-	printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
-	       name, name, PF_VERSION, major, cluster, nice);
-
-	par_drv = pi_register_driver(name);
-	if (!par_drv) {
-		pr_err("failed to register %s driver\n", name);
-		return -1;
-	}
-	k = 0;
-	if (pf_drive_count == 0) {
-		if (pi_init(pf->pi, 1, -1, -1, -1, -1, -1, pf_scratch, PI_PF,
-			    verbose, pf->name)) {
-			if (!pf_probe(pf) && pf->disk) {
-				pf->present = 1;
-				k++;
-			} else
-				pi_release(pf->pi);
-		}
-
-	} else
-		for (unit = 0; unit < PF_UNITS; unit++, pf++) {
-			int *conf = *drives[unit];
-			if (!conf[D_PRT])
-				continue;
-			if (pi_init(pf->pi, 0, conf[D_PRT], conf[D_MOD],
-				    conf[D_UNI], conf[D_PRO], conf[D_DLY],
-				    pf_scratch, PI_PF, verbose, pf->name)) {
-				if (pf->disk && !pf_probe(pf)) {
-					pf->present = 1;
-					k++;
-				} else
-					pi_release(pf->pi);
-			}
-		}
-	if (k)
-		return 0;
-
-	printk("%s: No ATAPI disk detected\n", name);
-	for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
-		if (!pf->disk)
-			continue;
-		blk_cleanup_disk(pf->disk);
-		blk_mq_free_tag_set(&pf->tag_set);
-	}
-	pi_unregister_driver(par_drv);
-	return -1;
-}
-
 /* The i/o request engine */
 
 static int pf_start(struct pf_unit *pf, int cmd, int b, int c)
@@ -1014,61 +921,129 @@ static void do_pf_write_done(void)
 	next_request(0);
 }
 
+static int __init pf_init_unit(struct pf_unit *pf, bool autoprobe, int port,
+		int mode, int unit, int protocol, int delay, int ms)
+{
+	struct gendisk *disk;
+	int ret;
+
+	ret = blk_mq_alloc_sq_tag_set(&pf->tag_set, &pf_mq_ops, 1,
+				      BLK_MQ_F_SHOULD_MERGE);
+	if (ret)
+		return ret;
+
+	disk = blk_mq_alloc_disk(&pf->tag_set, pf);
+	if (IS_ERR(disk)) {
+		ret = PTR_ERR(disk);
+		goto out_free_tag_set;
+	}
+	disk->major = major;
+	disk->first_minor = pf - units;
+	disk->minors = 1;
+	strcpy(disk->disk_name, pf->name);
+	disk->fops = &pf_fops;
+	disk->events = DISK_EVENT_MEDIA_CHANGE;
+	disk->private_data = pf;
+
+	blk_queue_max_segments(disk->queue, cluster);
+	blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
+
+	INIT_LIST_HEAD(&pf->rq_list);
+	pf->disk = disk;
+	pf->pi = &pf->pia;
+	pf->media_status = PF_NM;
+	pf->drive = (*drives[disk->first_minor])[D_SLV];
+	pf->lun = (*drives[disk->first_minor])[D_LUN];
+	snprintf(pf->name, PF_NAMELEN, "%s%d", name, disk->first_minor);
+
+	if (!pi_init(pf->pi, autoprobe, port, mode, unit, protocol, delay,
+			pf_scratch, PI_PF, verbose, pf->name))
+		goto out_free_disk;
+	if (pf_probe(pf))
+		goto out_pi_release;
+
+	add_disk(disk);
+	pf->present = 1;
+	return 0;
+
+out_pi_release:
+	pi_release(pf->pi);
+out_free_disk:
+	blk_cleanup_disk(pf->disk);
+out_free_tag_set:
+	blk_mq_free_tag_set(&pf->tag_set);
+	return ret;
+}
+
 static int __init pf_init(void)
 {				/* preliminary initialisation */
 	struct pf_unit *pf;
-	int unit;
+	int found = 0, unit;
 
 	if (disable)
 		return -EINVAL;
 
-	pf_init_units();
+	if (register_blkdev(major, name))
+		return -EBUSY;
 
-	if (pf_detect())
-		return -ENODEV;
-	pf_busy = 0;
+	printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
+	       name, name, PF_VERSION, major, cluster, nice);
 
-	if (register_blkdev(major, name)) {
-		for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
-			if (!pf->disk)
-				continue;
-			blk_cleanup_queue(pf->disk->queue);
-			blk_mq_free_tag_set(&pf->tag_set);
-			put_disk(pf->disk);
-		}
-		return -EBUSY;
+	par_drv = pi_register_driver(name);
+	if (!par_drv) {
+		pr_err("failed to register %s driver\n", name);
+		goto out_unregister_blkdev;
 	}
 
-	for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
-		struct gendisk *disk = pf->disk;
+	for (unit = 0; unit < PF_UNITS; unit++) {
+		if (!(*drives[unit])[D_PRT])
+			pf_drive_count++;
+	}
 
-		if (!pf->present)
-			continue;
-		disk->private_data = pf;
-		add_disk(disk);
+	pf = units;
+	if (pf_drive_count == 0) {
+		if (pf_init_unit(pf, 1, -1, -1, -1, -1, -1, verbose))
+			found++;
+	} else {
+		for (unit = 0; unit < PF_UNITS; unit++, pf++) {
+			int *conf = *drives[unit];
+			if (!conf[D_PRT])
+				continue;
+			if (pf_init_unit(pf, 0, conf[D_PRT], conf[D_MOD],
+				    conf[D_UNI], conf[D_PRO], conf[D_DLY],
+				    verbose))
+				found++;
+		}
+	}
+	if (!found) {
+		printk("%s: No ATAPI disk detected\n", name);
+		goto out_unregister_pi_driver;
 	}
+	pf_busy = 0;
 	return 0;
+
+out_unregister_pi_driver:
+	pi_unregister_driver(par_drv);
+out_unregister_blkdev:
+	unregister_blkdev(major, name);
+	return -ENODEV;
 }
 
 static void __exit pf_exit(void)
 {
 	struct pf_unit *pf;
 	int unit;
-	unregister_blkdev(major, name);
+
 	for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
-		if (!pf->disk)
+		if (!pf->present)
 			continue;
-
-		if (pf->present)
-			del_gendisk(pf->disk);
-
-		blk_cleanup_queue(pf->disk->queue);
+		del_gendisk(pf->disk);
+		blk_cleanup_disk(pf->disk);
 		blk_mq_free_tag_set(&pf->tag_set);
-		put_disk(pf->disk);
-
-		if (pf->present)
-			pi_release(pf->pi);
+		pi_release(pf->pi);
 	}
+
+	unregister_blkdev(major, name);
 }
 
 MODULE_LICENSE("GPL");
-- 
2.30.2

[PATCH 11/15] pd: cleanup initialization

[Luis Chamberlain]

From: Christoph Hellwig <hch@lst.de>

Refactor the pf initialization to have a dedicated helper to initialize
a single disk.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/block/paride/pd.c | 142 +++++++++++++++++++-------------------
 1 file changed, 71 insertions(+), 71 deletions(-)

diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 9b3298926356..500b89a4bdaf 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -875,9 +875,27 @@ static const struct blk_mq_ops pd_mq_ops = {
 	.queue_rq	= pd_queue_rq,
 };
 
-static void pd_probe_drive(struct pd_unit *disk)
+static int pd_probe_drive(struct pd_unit *disk, int autoprobe, int port,
+		int mode, int unit, int protocol, int delay)
 {
+	int index = disk - pd;
+	int *parm = *drives[index];
 	struct gendisk *p;
+	int ret;
+
+	disk->pi = &disk->pia;
+	disk->access = 0;
+	disk->changed = 1;
+	disk->capacity = 0;
+	disk->drive = parm[D_SLV];
+	snprintf(disk->name, PD_NAMELEN, "%s%c", name, 'a' + index);
+	disk->alt_geom = parm[D_GEO];
+	disk->standby = parm[D_SBY];
+	INIT_LIST_HEAD(&disk->rq_list);
+
+	if (!pi_init(disk->pi, autoprobe, port, mode, unit, protocol, delay,
+			pd_scratch, PI_PD, verbose, disk->name))
+		return -ENXIO;
 
 	memset(&disk->tag_set, 0, sizeof(disk->tag_set));
 	disk->tag_set.ops = &pd_mq_ops;
@@ -887,14 +905,14 @@ static void pd_probe_drive(struct pd_unit *disk)
 	disk->tag_set.queue_depth = 2;
 	disk->tag_set.numa_node = NUMA_NO_NODE;
 	disk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
-
-	if (blk_mq_alloc_tag_set(&disk->tag_set))
-		return;
+	ret = blk_mq_alloc_tag_set(&disk->tag_set);
+	if (ret)
+		goto pi_release;
 
 	p = blk_mq_alloc_disk(&disk->tag_set, disk);
-	if (!p) {
-		blk_mq_free_tag_set(&disk->tag_set);
-		return;
+	if (IS_ERR(p)) {
+		ret = PTR_ERR(p);
+		goto free_tag_set;
 	}
 	disk->gd = p;
 
@@ -905,102 +923,84 @@ static void pd_probe_drive(struct pd_unit *disk)
 	p->minors = 1 << PD_BITS;
 	p->events = DISK_EVENT_MEDIA_CHANGE;
 	p->private_data = disk;
-
 	blk_queue_max_hw_sectors(p->queue, cluster);
 	blk_queue_bounce_limit(p->queue, BLK_BOUNCE_HIGH);
 
 	if (disk->drive == -1) {
-		for (disk->drive = 0; disk->drive <= 1; disk->drive++)
-			if (pd_special_command(disk, pd_identify) == 0)
-				return;
-	} else if (pd_special_command(disk, pd_identify) == 0)
-		return;
-	disk->gd = NULL;
+		for (disk->drive = 0; disk->drive <= 1; disk->drive++) {
+			ret = pd_special_command(disk, pd_identify);
+			if (ret == 0)
+				break;
+		}
+	} else {
+		ret = pd_special_command(disk, pd_identify);
+	}
+	if (ret)
+		goto put_disk;
+	set_capacity(disk->gd, disk->capacity);
+	add_disk(disk->gd);
+	return 0;
+put_disk:
 	put_disk(p);
+	disk->gd = NULL;
+free_tag_set:
+	blk_mq_free_tag_set(&disk->tag_set);
+pi_release:
+	pi_release(disk->pi);
+	return ret;
 }
 
-static int pd_detect(void)
+static int __init pd_init(void)
 {
 	int found = 0, unit, pd_drive_count = 0;
 	struct pd_unit *disk;
 
-	for (unit = 0; unit < PD_UNITS; unit++) {
-		int *parm = *drives[unit];
-		struct pd_unit *disk = pd + unit;
-		disk->pi = &disk->pia;
-		disk->access = 0;
-		disk->changed = 1;
-		disk->capacity = 0;
-		disk->drive = parm[D_SLV];
-		snprintf(disk->name, PD_NAMELEN, "%s%c", name, 'a'+unit);
-		disk->alt_geom = parm[D_GEO];
-		disk->standby = parm[D_SBY];
-		if (parm[D_PRT])
-			pd_drive_count++;
-		INIT_LIST_HEAD(&disk->rq_list);
-	}
+	if (disable)
+		return -ENODEV;
+
+	if (register_blkdev(major, name))
+		return -ENODEV;
+
+	printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
+	       name, name, PD_VERSION, major, cluster, nice);
 
 	par_drv = pi_register_driver(name);
 	if (!par_drv) {
 		pr_err("failed to register %s driver\n", name);
-		return -1;
+		goto out_unregister_blkdev;
 	}
 
-	if (pd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
-		disk = pd;
-		if (pi_init(disk->pi, 1, -1, -1, -1, -1, -1, pd_scratch,
-			    PI_PD, verbose, disk->name)) {
-			pd_probe_drive(disk);
-			if (!disk->gd)
-				pi_release(disk->pi);
-		}
+	for (unit = 0; unit < PD_UNITS; unit++) {
+		int *parm = *drives[unit];
 
+		if (parm[D_PRT])
+			pd_drive_count++;
+	}
+
+	if (pd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
+		if (!pd_probe_drive(pd, 1, -1, -1, -1, -1, -1))
+			found++;
 	} else {
 		for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
 			int *parm = *drives[unit];
 			if (!parm[D_PRT])
 				continue;
-			if (pi_init(disk->pi, 0, parm[D_PRT], parm[D_MOD],
-				     parm[D_UNI], parm[D_PRO], parm[D_DLY],
-				     pd_scratch, PI_PD, verbose, disk->name)) {
-				pd_probe_drive(disk);
-				if (!disk->gd)
-					pi_release(disk->pi);
-			}
-		}
-	}
-	for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
-		if (disk->gd) {
-			set_capacity(disk->gd, disk->capacity);
-			add_disk(disk->gd);
-			found = 1;
+			if (!pd_probe_drive(disk, 0, parm[D_PRT], parm[D_MOD],
+					parm[D_UNI], parm[D_PRO], parm[D_DLY]))
+				found++;
 		}
 	}
 	if (!found) {
 		printk("%s: no valid drive found\n", name);
-		pi_unregister_driver(par_drv);
+		goto out_pi_unregister_driver;
 	}
-	return found;
-}
-
-static int __init pd_init(void)
-{
-	if (disable)
-		goto out1;
-
-	if (register_blkdev(major, name))
-		goto out1;
-
-	printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
-	       name, name, PD_VERSION, major, cluster, nice);
-	if (!pd_detect())
-		goto out2;
 
 	return 0;
 
-out2:
+out_pi_unregister_driver:
+	pi_unregister_driver(par_drv);
+out_unregister_blkdev:
 	unregister_blkdev(major, name);
-out1:
 	return -ENODEV;
 }
 
-- 
2.30.2

[PATCH 12/15] pcd: add error handling support for add_disk()

[Luis Chamberlain]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 drivers/block/paride/pcd.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 93ed63626232..a7fab3830d7b 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -941,9 +941,13 @@ static int pcd_init_unit(struct pcd_unit *cd, bool autoprobe, int port,
 	cd->present = 1;
 	pcd_probe_capabilities(cd);
 	register_cdrom(cd->disk, &cd->info);
-	add_disk(cd->disk);
+	ret = add_disk(cd->disk);
+	if (ret)
+		goto out_unreg_cdrom;
 	return 0;
 
+out_unreg_cdrom:
+	unregister_cdrom(&cd->info);
 out_pi_release:
 	pi_release(cd->pi);
 out_free_disk:
-- 
2.30.2

[PATCH 13/15] pcd: fix ordering of unregister_cdrom()

[Luis Chamberlain]

We first register cdrom and then we add_disk() and
so we we should likewise unregister the cdrom first and
then del_gendisk().

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 drivers/block/paride/pcd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index a7fab3830d7b..82a654fc4db8 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -1021,9 +1021,9 @@ static void __exit pcd_exit(void)
 		if (!cd->present)
 			continue;
 
+		unregister_cdrom(&cd->info);
 		del_gendisk(cd->disk);
 		pi_release(cd->pi);
-		unregister_cdrom(&cd->info);
 		blk_cleanup_disk(cd->disk);
 
 		blk_mq_free_tag_set(&cd->tag_set);
-- 
2.30.2

[PATCH 14/15] pcd: capture errors on cdrom_register()

[Luis Chamberlain]

No errors were being captured wehen cdrom_register() fails,
capture the error and return the error.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 drivers/block/paride/pcd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 82a654fc4db8..4cc0d141db78 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -940,7 +940,9 @@ static int pcd_init_unit(struct pcd_unit *cd, bool autoprobe, int port,
 
 	cd->present = 1;
 	pcd_probe_capabilities(cd);
-	register_cdrom(cd->disk, &cd->info);
+	ret = register_cdrom(cd->disk, &cd->info);
+	if (ret)
+		goto out_pi_release;
 	ret = add_disk(cd->disk);
 	if (ret)
 		goto out_unreg_cdrom;
-- 
2.30.2

[PATCH 15/15] pd: add error handling support for add_disk()

[Luis Chamberlain]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 drivers/block/paride/pd.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 500b89a4bdaf..226ed5c93b68 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -938,8 +938,12 @@ static int pd_probe_drive(struct pd_unit *disk, int autoprobe, int port,
 	if (ret)
 		goto put_disk;
 	set_capacity(disk->gd, disk->capacity);
-	add_disk(disk->gd);
+	ret = add_disk(disk->gd);
+	if (ret)
+		goto cleanup_disk;
 	return 0;
+cleanup_disk:
+	blk_cleanup_disk(&disk);
 put_disk:
 	put_disk(p);
 	disk->gd = NULL;
-- 
2.30.2

Re: [PATCH 01/15] z2ram: add error handling support for add_disk()

[Geert Uytterhoeven]

Hi Luis,

On Tue, Aug 31, 2021 at 12:10 AM Luis Chamberlain <mcgrof@kernel.org> wrote:
> We never checked for errors on add_disk() as this function
> returned void. Now that this is fixed, use the shiny new
> error handling. Only the disk is cleaned up inside
> z2ram_register_disk() as the caller deals with the rest.
>
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

Thanks for your patch!

> --- a/drivers/block/z2ram.c
> +++ b/drivers/block/z2ram.c
> @@ -318,6 +318,7 @@ static const struct blk_mq_ops z2_mq_ops = {
>  static int z2ram_register_disk(int minor)
>  {
>         struct gendisk *disk;
> +       int err;
>
>         disk = blk_mq_alloc_disk(&tag_set, NULL);
>         if (IS_ERR(disk))
> @@ -333,8 +334,10 @@ static int z2ram_register_disk(int minor)
>                 sprintf(disk->disk_name, "z2ram");
>
>         z2ram_gendisk[minor] = disk;
> -       add_disk(disk);
> -       return 0;
> +       err = add_disk(disk);
> +       if (err)
> +               blk_cleaup_disk(disk);

blk_cleanup_disk()?

Seems like lkp already detected this back in July...

> +       return err;
>  }
>
>  static int __init z2_init(void)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 03/15] m68k/emu/nfblock: add error handling support for add_disk()

[Geert Uytterhoeven]

On Tue, Aug 31, 2021 at 12:10 AM Luis Chamberlain <mcgrof@kernel.org> wrote:
> We never checked for errors on add_disk() as this function
> returned void. Now that this is fixed, use the shiny new
> error handling.
>
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 05/15] um/drivers/ubd_kern: add error handling support for add_disk()

[Gabriel Krisman Bertazi]

Luis Chamberlain <mcgrof@kernel.org> writes:

> We never checked for errors on add_disk() as this function
> returned void. Now that this is fixed, use the shiny new
> error handling.
>
> ubd_disk_register() never returned an error, so just fix
> that now and let the caller handle the error condition.
>
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.com>

> ---
>  arch/um/drivers/ubd_kern.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
> index cd9dc0556e91..81045c199c30 100644
> --- a/arch/um/drivers/ubd_kern.c
> +++ b/arch/um/drivers/ubd_kern.c
> @@ -854,8 +854,8 @@ static const struct attribute_group *ubd_attr_groups[] = {
>  	NULL,
>  };
>  
> -static void ubd_disk_register(int major, u64 size, int unit,
> -			      struct gendisk *disk)
> +static int ubd_disk_register(int major, u64 size, int unit,
> +			     struct gendisk *disk)
>  {
>  	disk->major = major;
>  	disk->first_minor = unit << UBD_SHIFT;
> @@ -872,7 +872,7 @@ static void ubd_disk_register(int major, u64 size, int unit,
>  
>  	disk->private_data = &ubd_devs[unit];
>  	disk->queue = ubd_devs[unit].queue;
> -	device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups);
> +	return device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups);
>  }
>  
>  #define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE))
> @@ -919,10 +919,15 @@ static int ubd_add(int n, char **error_out)
>  	blk_queue_write_cache(ubd_dev->queue, true, false);
>  	blk_queue_max_segments(ubd_dev->queue, MAX_SG);
>  	blk_queue_segment_boundary(ubd_dev->queue, PAGE_SIZE - 1);
> -	ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, disk);
> +	err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, disk);
> +	if (err)
> +		goto out_cleanup_disk;
> +
>  	ubd_gendisk[n] = disk;
>  	return 0;
>  
> +out_cleanup_disk:
> +	blk_cleanup_disk(disk);
>  out_cleanup_tags:
>  	blk_mq_free_tag_set(&ubd_dev->tag_set);
>  out:

-- 
Gabriel Krisman Bertazi

Re: [PATCH 15/15] pd: add error handling support for add_disk()

[Luis Chamberlain]

On Mon, Aug 30, 2021 at 03:10:00PM -0700, Luis Chamberlain wrote:
> We never checked for errors on add_disk() as this function
> returned void. Now that this is fixed, use the shiny new
> error handling.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
> ---
>  drivers/block/paride/pd.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
> index 500b89a4bdaf..226ed5c93b68 100644
> --- a/drivers/block/paride/pd.c
> +++ b/drivers/block/paride/pd.c
> @@ -938,8 +938,12 @@ static int pd_probe_drive(struct pd_unit *disk, int autoprobe, int port,
>  	if (ret)
>  		goto put_disk;
>  	set_capacity(disk->gd, disk->capacity);
> -	add_disk(disk->gd);
> +	ret = add_disk(disk->gd);
> +	if (ret)
> +		goto cleanup_disk;
>  	return 0;
> +cleanup_disk:
> +	blk_cleanup_disk(&disk);

This should be blk_cleanup_disk(disk->gd); Will fix up in my v2.

  Luis

Re: [PATCH 01/15] z2ram: add error handling support for add_disk()

[Luis Chamberlain]

On Wed, Sep 01, 2021 at 03:41:47PM +0200, Geert Uytterhoeven wrote:
> > --- a/drivers/block/z2ram.c
> > +++ b/drivers/block/z2ram.c
> > @@ -333,8 +334,10 @@ static int z2ram_register_disk(int minor)
> >                 sprintf(disk->disk_name, "z2ram");
> >
> >         z2ram_gendisk[minor] = disk;
> > -       add_disk(disk);
> > -       return 0;
> > +       err = add_disk(disk);
> > +       if (err)
> > +               blk_cleaup_disk(disk);
> 
> blk_cleanup_disk()?

Fixed thanks.

  Luis