[PATCH 0/8] EDAC: Clean up device_create_file() & co

[PATCH 0/8] EDAC: Clean up device_create_file() & co

[Takashi Iwai]

Hi,

this is a series of cleanup patches to replace the manual
device_create_file() and device_remove_file() calls with the static
attribute groups.  This simplifies the code and also avoids the
possible races between the device registration and sysfs creations.

Non-x86 driver have been only compile-tested.


Takashi

===

Takashi Iwai (8):
  EDAC: core: Use static attribute groups for managing sysfs entries
  EDAC: Allow to pass driver-specific attribute groups
  EDAC: amd64: Use static attribute groups
  EDAC: i7core: Return proper error codes for kzalloc() errors
  EDAC: i7core: Use static attribute groups for sysfs entries
  EDAC: mpc85xx: Use static attribute groups for sysfs entries
  EDAC: octeon: Use static attribute groups for sysfs entries
  EDAC: highbank: Use static attribute groups for sysfs entries

 drivers/edac/amd64_edac.c       |  47 +++---------
 drivers/edac/amd64_edac.h       |  24 +-----
 drivers/edac/amd64_edac_dbg.c   |  43 +++--------
 drivers/edac/amd64_edac_inj.c   |  51 ++++++-------
 drivers/edac/edac_core.h        |   4 +-
 drivers/edac/edac_mc.c          |  12 +--
 drivers/edac/edac_mc_sysfs.c    | 162 ++++++++++++++++++----------------------
 drivers/edac/edac_module.h      |   3 +-
 drivers/edac/highbank_mc_edac.c |  12 ++-
 drivers/edac/i7core_edac.c      |  33 +++-----
 drivers/edac/mpc85xx_edac.c     |  38 ++--------
 drivers/edac/octeon_edac-lmc.c  |  55 ++++----------
 12 files changed, 174 insertions(+), 310 deletions(-)

-- 
2.2.2

[PATCH 1/8] EDAC: core: Use static attribute groups for managing sysfs entries

[Takashi Iwai]

Instead of manual calls of device_create_file() and
device_remove_file(), use static attribute groups with proper
is_visible callbacks for managing the sysfs entries.

This simplifies the code a lot and avoids the possible races.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/edac/edac_mc_sysfs.c | 158 +++++++++++++++++++------------------------
 1 file changed, 71 insertions(+), 87 deletions(-)

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 670d2829c547..2ab3ea0349fb 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -323,13 +323,14 @@ DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 	channel_dimm_label_show, channel_dimm_label_store, 5);
 
 /* Total possible dynamic DIMM Label attribute file table */
-static struct device_attribute *dynamic_csrow_dimm_attr[] = {
-	&dev_attr_legacy_ch0_dimm_label.attr,
-	&dev_attr_legacy_ch1_dimm_label.attr,
-	&dev_attr_legacy_ch2_dimm_label.attr,
-	&dev_attr_legacy_ch3_dimm_label.attr,
-	&dev_attr_legacy_ch4_dimm_label.attr,
-	&dev_attr_legacy_ch5_dimm_label.attr
+static struct attribute *dynamic_csrow_dimm_attr[] = {
+	&dev_attr_legacy_ch0_dimm_label.attr.attr,
+	&dev_attr_legacy_ch1_dimm_label.attr.attr,
+	&dev_attr_legacy_ch2_dimm_label.attr.attr,
+	&dev_attr_legacy_ch3_dimm_label.attr.attr,
+	&dev_attr_legacy_ch4_dimm_label.attr.attr,
+	&dev_attr_legacy_ch5_dimm_label.attr.attr,
+	NULL
 };
 
 /* possible dynamic channel ce_count attribute files */
@@ -347,13 +348,45 @@ DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 		   channel_ce_count_show, NULL, 5);
 
 /* Total possible dynamic ce_count attribute file table */
-static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
-	&dev_attr_legacy_ch0_ce_count.attr,
-	&dev_attr_legacy_ch1_ce_count.attr,
-	&dev_attr_legacy_ch2_ce_count.attr,
-	&dev_attr_legacy_ch3_ce_count.attr,
-	&dev_attr_legacy_ch4_ce_count.attr,
-	&dev_attr_legacy_ch5_ce_count.attr
+static struct attribute *dynamic_csrow_ce_count_attr[] = {
+	&dev_attr_legacy_ch0_ce_count.attr.attr,
+	&dev_attr_legacy_ch1_ce_count.attr.attr,
+	&dev_attr_legacy_ch2_ce_count.attr.attr,
+	&dev_attr_legacy_ch3_ce_count.attr.attr,
+	&dev_attr_legacy_ch4_ce_count.attr.attr,
+	&dev_attr_legacy_ch5_ce_count.attr.attr,
+	NULL
+};
+
+static umode_t csrow_dev_is_visible(struct kobject *kobj,
+				    struct attribute *attr, int idx)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
+
+	if (idx >= csrow->nr_channels)
+		return 0;
+	/* Only expose populated DIMMs */
+	if (!csrow->channels[idx]->dimm->nr_pages)
+		return 0;
+	return attr->mode;
+}
+
+
+static const struct attribute_group csrow_dev_dimm_group = {
+	.attrs = dynamic_csrow_dimm_attr,
+	.is_visible = csrow_dev_is_visible,
+};
+
+static const struct attribute_group csrow_dev_ce_count_group = {
+	.attrs = dynamic_csrow_ce_count_attr,
+	.is_visible = csrow_dev_is_visible,
+};
+
+static const struct attribute_group *csrow_dev_groups[] = {
+	&csrow_dev_dimm_group,
+	&csrow_dev_ce_count_group,
+	NULL
 };
 
 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
@@ -370,13 +403,12 @@ static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 				    struct csrow_info *csrow, int index)
 {
-	int err, chan;
-
 	if (csrow->nr_channels > EDAC_NR_CHANNELS)
 		return -ENODEV;
 
 	csrow->dev.type = &csrow_attr_type;
 	csrow->dev.bus = mci->bus;
+	csrow->dev.groups = csrow_dev_groups;
 	device_initialize(&csrow->dev);
 	csrow->dev.parent = &mci->dev;
 	csrow->mci = mci;
@@ -386,45 +418,13 @@ static int edac_create_csrow_object(struct mem_ctl_info *mci,
 	edac_dbg(0, "creating (virtual) csrow node %s\n",
 		 dev_name(&csrow->dev));
 
-	err = device_add(&csrow->dev);
-	if (err < 0)
-		return err;
-
-	for (chan = 0; chan < csrow->nr_channels; chan++) {
-		/* Only expose populated DIMMs */
-		if (!csrow->channels[chan]->dimm->nr_pages)
-			continue;
-		err = device_create_file(&csrow->dev,
-					 dynamic_csrow_dimm_attr[chan]);
-		if (err < 0)
-			goto error;
-		err = device_create_file(&csrow->dev,
-					 dynamic_csrow_ce_count_attr[chan]);
-		if (err < 0) {
-			device_remove_file(&csrow->dev,
-					   dynamic_csrow_dimm_attr[chan]);
-			goto error;
-		}
-	}
-
-	return 0;
-
-error:
-	for (--chan; chan >= 0; chan--) {
-		device_remove_file(&csrow->dev,
-					dynamic_csrow_dimm_attr[chan]);
-		device_remove_file(&csrow->dev,
-					   dynamic_csrow_ce_count_attr[chan]);
-	}
-	put_device(&csrow->dev);
-
-	return err;
+	return device_add(&csrow->dev);
 }
 
 /* Create a CSROW object under specifed edac_mc_device */
 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 {
-	int err, i, chan;
+	int err, i;
 	struct csrow_info *csrow;
 
 	for (i = 0; i < mci->nr_csrows; i++) {
@@ -446,14 +446,6 @@ error:
 		csrow = mci->csrows[i];
 		if (!nr_pages_per_csrow(csrow))
 			continue;
-		for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
-			if (!csrow->channels[chan]->dimm->nr_pages)
-				continue;
-			device_remove_file(&csrow->dev,
-						dynamic_csrow_dimm_attr[chan]);
-			device_remove_file(&csrow->dev,
-						dynamic_csrow_ce_count_attr[chan]);
-		}
 		put_device(&mci->csrows[i]->dev);
 	}
 
@@ -462,23 +454,13 @@ error:
 
 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 {
-	int i, chan;
+	int i;
 	struct csrow_info *csrow;
 
 	for (i = mci->nr_csrows - 1; i >= 0; i--) {
 		csrow = mci->csrows[i];
 		if (!nr_pages_per_csrow(csrow))
 			continue;
-		for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
-			if (!csrow->channels[chan]->dimm->nr_pages)
-				continue;
-			edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
-				 i, chan);
-			device_remove_file(&csrow->dev,
-						dynamic_csrow_dimm_attr[chan]);
-			device_remove_file(&csrow->dev,
-						dynamic_csrow_ce_count_attr[chan]);
-		}
 		device_unregister(&mci->csrows[i]->dev);
 	}
 }
@@ -863,7 +845,8 @@ DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 
 /* memory scrubber attribute file */
-DEVICE_ATTR(sdram_scrub_rate, 0, NULL, NULL);
+DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
+	    mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 
 static struct attribute *mci_attrs[] = {
 	&dev_attr_reset_counters.attr,
@@ -875,11 +858,29 @@ static struct attribute *mci_attrs[] = {
 	&dev_attr_ue_count.attr,
 	&dev_attr_ce_count.attr,
 	&dev_attr_max_location.attr,
+	&dev_attr_sdram_scrub_rate.attr,
 	NULL
 };
 
+static umode_t mci_attr_is_visible(struct kobject *kobj,
+				   struct attribute *attr, int idx)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct mem_ctl_info *mci = to_mci(dev);
+	umode_t mode = 0;
+
+	if (attr != &dev_attr_sdram_scrub_rate.attr)
+		return attr->mode;
+	if (mci->get_sdram_scrub_rate)
+		mode |= S_IRUGO;
+	if (mci->set_sdram_scrub_rate)
+		mode |= S_IWUSR;
+	return mode;
+}
+
 static struct attribute_group mci_attr_grp = {
 	.attrs	= mci_attrs,
+	.is_visible = mci_attr_is_visible,
 };
 
 static const struct attribute_group *mci_attr_groups[] = {
@@ -1010,22 +1011,6 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 		return err;
 	}
 
-	if (mci->set_sdram_scrub_rate || mci->get_sdram_scrub_rate) {
-		if (mci->get_sdram_scrub_rate) {
-			dev_attr_sdram_scrub_rate.attr.mode |= S_IRUGO;
-			dev_attr_sdram_scrub_rate.show = &mci_sdram_scrub_rate_show;
-		}
-		if (mci->set_sdram_scrub_rate) {
-			dev_attr_sdram_scrub_rate.attr.mode |= S_IWUSR;
-			dev_attr_sdram_scrub_rate.store = &mci_sdram_scrub_rate_store;
-		}
-		err = device_create_file(&mci->dev,
-					 &dev_attr_sdram_scrub_rate);
-		if (err) {
-			edac_dbg(1, "failure: create sdram_scrub_rate\n");
-			goto fail2;
-		}
-	}
 	/*
 	 * Create the dimm/rank devices
 	 */
@@ -1070,7 +1055,6 @@ fail:
 			continue;
 		device_unregister(&dimm->dev);
 	}
-fail2:
 	device_unregister(&mci->dev);
 	bus_unregister(mci->bus);
 	kfree(mci->bus->name);
-- 
2.2.2

[PATCH 2/8] EDAC: Allow to pass driver-specific attribute groups

[Takashi Iwai]

Add edac_mc_add_mc_with_groups() for initializing the mem_ctl_info
object with the optional attribute groups.  This allows drivers to
pass additional sysfs entries without manual (and racy)
device_create_file() and co calls.

edac_mc_add_mc() is kept as is, just calling edac_mc_add_with_groups()
with NULL groups.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/edac/edac_core.h     |  4 +++-
 drivers/edac/edac_mc.c       | 12 +++++++-----
 drivers/edac/edac_mc_sysfs.c |  4 +++-
 drivers/edac/edac_module.h   |  3 ++-
 4 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/edac/edac_core.h b/drivers/edac/edac_core.h
index 6c9f381e8fe6..ad42587c3f4d 100644
--- a/drivers/edac/edac_core.h
+++ b/drivers/edac/edac_core.h
@@ -446,7 +446,9 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
 				   unsigned n_layers,
 				   struct edac_mc_layer *layers,
 				   unsigned sz_pvt);
-extern int edac_mc_add_mc(struct mem_ctl_info *mci);
+extern int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
+				      const struct attribute_group **groups);
+#define edac_mc_add_mc(mci)	edac_mc_add_mc_with_groups(mci, NULL)
 extern void edac_mc_free(struct mem_ctl_info *mci);
 extern struct mem_ctl_info *edac_mc_find(int idx);
 extern struct mem_ctl_info *find_mci_by_dev(struct device *dev);
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 1747906f10ce..af3be1914dbb 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -710,9 +710,10 @@ struct mem_ctl_info *edac_mc_find(int idx)
 EXPORT_SYMBOL(edac_mc_find);
 
 /**
- * edac_mc_add_mc: Insert the 'mci' structure into the mci global list and
- *                 create sysfs entries associated with mci structure
+ * edac_mc_add_mc_with_groups: Insert the 'mci' structure into the mci
+ *	global list and create sysfs entries associated with mci structure
  * @mci: pointer to the mci structure to be added to the list
+ * @groups: optional attribute groups for the driver-specific sysfs entries
  *
  * Return:
  *	0	Success
@@ -720,7 +721,8 @@ EXPORT_SYMBOL(edac_mc_find);
  */
 
 /* FIXME - should a warning be printed if no error detection? correction? */
-int edac_mc_add_mc(struct mem_ctl_info *mci)
+int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
+			       const struct attribute_group **groups)
 {
 	int ret = -EINVAL;
 	edac_dbg(0, "\n");
@@ -771,7 +773,7 @@ int edac_mc_add_mc(struct mem_ctl_info *mci)
 
 	mci->bus = &mc_bus[mci->mc_idx];
 
-	if (edac_create_sysfs_mci_device(mci)) {
+	if (edac_create_sysfs_mci_device(mci, groups)) {
 		edac_mc_printk(mci, KERN_WARNING,
 			"failed to create sysfs device\n");
 		goto fail1;
@@ -805,7 +807,7 @@ fail0:
 	mutex_unlock(&mem_ctls_mutex);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(edac_mc_add_mc);
+EXPORT_SYMBOL_GPL(edac_mc_add_mc_with_groups);
 
 /**
  * edac_mc_del_mc: Remove sysfs entries for specified mci structure and
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 2ab3ea0349fb..a4cb66b55763 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -974,7 +974,8 @@ nomem:
  *	0	Success
  *	!0	Failure
  */
-int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
+int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
+				 const struct attribute_group **groups)
 {
 	int i, err;
 
@@ -998,6 +999,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 
 	mci->dev.parent = mci_pdev;
 	mci->dev.bus = mci->bus;
+	mci->dev.groups = groups;
 	dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 	dev_set_drvdata(&mci->dev, mci);
 	pm_runtime_forbid(&mci->dev);
diff --git a/drivers/edac/edac_module.h b/drivers/edac/edac_module.h
index f2118bfcf8df..26ecc52e073d 100644
--- a/drivers/edac/edac_module.h
+++ b/drivers/edac/edac_module.h
@@ -22,7 +22,8 @@
 	/* on edac_mc_sysfs.c */
 int edac_mc_sysfs_init(void);
 void edac_mc_sysfs_exit(void);
-extern int edac_create_sysfs_mci_device(struct mem_ctl_info *mci);
+extern int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
+					const struct attribute_group **groups);
 extern void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci);
 void edac_unregister_sysfs(struct mem_ctl_info *mci);
 extern int edac_get_log_ue(void);
-- 
2.2.2

[PATCH 3/8] EDAC: amd64: Use static attribute groups

[Takashi Iwai]

Instead of calling device_create_file() and device_remove_file()
manually, pass the static attribute groups with the new
edac_mc_add_mc_with_groups().  The conditional creation of inject
sysfs files is done by a proper is_visible callback.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/edac/amd64_edac.c     | 47 ++++++++++-----------------------------
 drivers/edac/amd64_edac.h     | 24 ++------------------
 drivers/edac/amd64_edac_dbg.c | 43 ++++++++++--------------------------
 drivers/edac/amd64_edac_inj.c | 51 +++++++++++++++++++------------------------
 4 files changed, 47 insertions(+), 118 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 17638d7cf5c2..f888899c73e4 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -2657,34 +2657,6 @@ static bool ecc_enabled(struct pci_dev *F3, u16 nid)
 	return true;
 }
 
-static int set_mc_sysfs_attrs(struct mem_ctl_info *mci)
-{
-	struct amd64_pvt *pvt = mci->pvt_info;
-	int rc;
-
-	rc = amd64_create_sysfs_dbg_files(mci);
-	if (rc < 0)
-		return rc;
-
-	if (pvt->fam >= 0x10) {
-		rc = amd64_create_sysfs_inject_files(mci);
-		if (rc < 0)
-			return rc;
-	}
-
-	return 0;
-}
-
-static void del_mc_sysfs_attrs(struct mem_ctl_info *mci)
-{
-	struct amd64_pvt *pvt = mci->pvt_info;
-
-	amd64_remove_sysfs_dbg_files(mci);
-
-	if (pvt->fam >= 0x10)
-		amd64_remove_sysfs_inject_files(mci);
-}
-
 static void setup_mci_misc_attrs(struct mem_ctl_info *mci,
 				 struct amd64_family_type *fam)
 {
@@ -2772,6 +2744,16 @@ static struct amd64_family_type *per_family_init(struct amd64_pvt *pvt)
 	return fam_type;
 }
 
+static const struct attribute_group *amd64_edac_attr_groups[] = {
+#ifdef CONFIG_EDAC_DEBUG
+	&amd64_edac_dbg_group,
+#endif
+#ifdef CONFIG_EDAC_AMD64_ERROR_INJECTION
+	&amd64_edac_inj_group,
+#endif
+	NULL
+};
+
 static int init_one_instance(struct pci_dev *F2)
 {
 	struct amd64_pvt *pvt = NULL;
@@ -2838,14 +2820,10 @@ static int init_one_instance(struct pci_dev *F2)
 		mci->edac_cap = EDAC_FLAG_NONE;
 
 	ret = -ENODEV;
-	if (edac_mc_add_mc(mci)) {
+	if (edac_mc_add_mc_with_groups(mci, amd64_edac_attr_groups)) {
 		edac_dbg(1, "failed edac_mc_add_mc()\n");
 		goto err_add_mc;
 	}
-	if (set_mc_sysfs_attrs(mci)) {
-		edac_dbg(1, "failed edac_mc_add_mc()\n");
-		goto err_add_sysfs;
-	}
 
 	/* register stuff with EDAC MCE */
 	if (report_gart_errors)
@@ -2859,8 +2837,6 @@ static int init_one_instance(struct pci_dev *F2)
 
 	return 0;
 
-err_add_sysfs:
-	edac_mc_del_mc(mci->pdev);
 err_add_mc:
 	edac_mc_free(mci);
 
@@ -2934,7 +2910,6 @@ static void remove_one_instance(struct pci_dev *pdev)
 	mci = find_mci_by_dev(&pdev->dev);
 	WARN_ON(!mci);
 
-	del_mc_sysfs_attrs(mci);
 	/* Remove from EDAC CORE tracking list */
 	mci = edac_mc_del_mc(&pdev->dev);
 	if (!mci)
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index d8468c667925..4bdec752d330 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -453,31 +453,11 @@ struct ecc_settings {
 };
 
 #ifdef CONFIG_EDAC_DEBUG
-int amd64_create_sysfs_dbg_files(struct mem_ctl_info *mci);
-void amd64_remove_sysfs_dbg_files(struct mem_ctl_info *mci);
-
-#else
-static inline int amd64_create_sysfs_dbg_files(struct mem_ctl_info *mci)
-{
-	return 0;
-}
-static void inline amd64_remove_sysfs_dbg_files(struct mem_ctl_info *mci)
-{
-}
+extern const struct attribute_group amd64_edac_dbg_group;
 #endif
 
 #ifdef CONFIG_EDAC_AMD64_ERROR_INJECTION
-int amd64_create_sysfs_inject_files(struct mem_ctl_info *mci);
-void amd64_remove_sysfs_inject_files(struct mem_ctl_info *mci);
-
-#else
-static inline int amd64_create_sysfs_inject_files(struct mem_ctl_info *mci)
-{
-	return 0;
-}
-static inline void amd64_remove_sysfs_inject_files(struct mem_ctl_info *mci)
-{
-}
+extern const struct attribute_group amd64_edac_inj_group;
 #endif
 
 /*
diff --git a/drivers/edac/amd64_edac_dbg.c b/drivers/edac/amd64_edac_dbg.c
index 2c1bbf740605..4709c6079848 100644
--- a/drivers/edac/amd64_edac_dbg.c
+++ b/drivers/edac/amd64_edac_dbg.c
@@ -40,34 +40,15 @@ static DEVICE_ATTR(topmem, S_IRUGO, amd64_top_mem_show, NULL);
 static DEVICE_ATTR(topmem2, S_IRUGO, amd64_top_mem2_show, NULL);
 static DEVICE_ATTR(dram_hole, S_IRUGO, amd64_hole_show, NULL);
 
-int amd64_create_sysfs_dbg_files(struct mem_ctl_info *mci)
-{
-	int rc;
-
-	rc = device_create_file(&mci->dev, &dev_attr_dhar);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_dbam);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_topmem);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_topmem2);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_dram_hole);
-	if (rc < 0)
-		return rc;
-
-	return 0;
-}
-
-void amd64_remove_sysfs_dbg_files(struct mem_ctl_info *mci)
-{
-	device_remove_file(&mci->dev, &dev_attr_dhar);
-	device_remove_file(&mci->dev, &dev_attr_dbam);
-	device_remove_file(&mci->dev, &dev_attr_topmem);
-	device_remove_file(&mci->dev, &dev_attr_topmem2);
-	device_remove_file(&mci->dev, &dev_attr_dram_hole);
-}
+static struct attribute *amd64_edac_dbg_attrs[] = {
+	&dev_attr_dhar.attr,
+	&dev_attr_dbam.attr,
+	&dev_attr_topmem.attr,
+	&dev_attr_topmem2.attr,
+	&dev_attr_dram_hole.attr,
+	NULL
+};
+
+const struct attribute_group amd64_edac_dbg_group = {
+	.attrs = amd64_edac_dbg_attrs,
+};
diff --git a/drivers/edac/amd64_edac_inj.c b/drivers/edac/amd64_edac_inj.c
index 0d66ae68d468..e14977ff95db 100644
--- a/drivers/edac/amd64_edac_inj.c
+++ b/drivers/edac/amd64_edac_inj.c
@@ -207,35 +207,28 @@ static DEVICE_ATTR(inject_write, S_IWUSR,
 static DEVICE_ATTR(inject_read,  S_IWUSR,
 		   NULL, amd64_inject_read_store);
 
-
-int amd64_create_sysfs_inject_files(struct mem_ctl_info *mci)
+static struct attribute *amd64_edac_inj_attrs[] = {
+	&dev_attr_inject_section.attr,
+	&dev_attr_inject_word.attr,
+	&dev_attr_inject_ecc_vector.attr,
+	&dev_attr_inject_write.attr,
+	&dev_attr_inject_read.attr,
+	NULL
+};
+
+static umode_t amd64_edac_inj_is_visible(struct kobject *kobj,
+					 struct attribute *attr, int idx)
 {
-	int rc;
-
-	rc = device_create_file(&mci->dev, &dev_attr_inject_section);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_inject_word);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_inject_ecc_vector);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_inject_write);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_inject_read);
-	if (rc < 0)
-		return rc;
-
-	return 0;
-}
+	struct device *dev = kobj_to_dev(kobj);
+	struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
+	struct amd64_pvt *pvt = mci->pvt_info;
 
-void amd64_remove_sysfs_inject_files(struct mem_ctl_info *mci)
-{
-	device_remove_file(&mci->dev, &dev_attr_inject_section);
-	device_remove_file(&mci->dev, &dev_attr_inject_word);
-	device_remove_file(&mci->dev, &dev_attr_inject_ecc_vector);
-	device_remove_file(&mci->dev, &dev_attr_inject_write);
-	device_remove_file(&mci->dev, &dev_attr_inject_read);
+	if (pvt->fam < 0x10)
+		return 0;
+	return attr->mode;
 }
+
+const struct attribute_group amd64_edac_inj_group = {
+	.attrs = amd64_edac_inj_attrs,
+	.is_visible = amd64_edac_inj_is_visible,
+};
-- 
2.2.2

[PATCH 4/8] EDAC: i7core: Return proper error codes for kzalloc() errors

[Takashi Iwai]

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/edac/i7core_edac.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 9cd0b301f81b..5da90ded54b6 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -1177,7 +1177,7 @@ static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
 
 	pvt->addrmatch_dev = kzalloc(sizeof(*pvt->addrmatch_dev), GFP_KERNEL);
 	if (!pvt->addrmatch_dev)
-		return rc;
+		return -ENOMEM;
 
 	pvt->addrmatch_dev->type = &addrmatch_type;
 	pvt->addrmatch_dev->bus = mci->dev.bus;
@@ -1198,7 +1198,7 @@ static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
 		if (!pvt->chancounts_dev) {
 			put_device(pvt->addrmatch_dev);
 			device_del(pvt->addrmatch_dev);
-			return rc;
+			return -ENOMEM;
 		}
 
 		pvt->chancounts_dev->type = &all_channel_counts_type;
-- 
2.2.2

[PATCH 5/8] EDAC: i7core: Use static attribute groups for sysfs entries

[Takashi Iwai]

... instead of manual device_create_file() and device_remove_file()
calls.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/edac/i7core_edac.c | 29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 5da90ded54b6..90f6ba57f0d3 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -1157,24 +1157,20 @@ static DEVICE_ATTR(inject_eccmask, S_IRUGO | S_IWUSR,
 static DEVICE_ATTR(inject_enable, S_IRUGO | S_IWUSR,
 		   i7core_inject_enable_show, i7core_inject_enable_store);
 
+static struct attribute *i7core_dev_attrs[] = {
+	&dev_attr_inject_section.attr,
+	&dev_attr_inject_type.attr,
+	&dev_attr_inject_eccmask.attr,
+	&dev_attr_inject_enable.attr,
+};
+
+ATTRIBUTE_GROUPS(i7core_dev);
+
 static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
 {
 	struct i7core_pvt *pvt = mci->pvt_info;
 	int rc;
 
-	rc = device_create_file(&mci->dev, &dev_attr_inject_section);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_inject_type);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_inject_eccmask);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_inject_enable);
-	if (rc < 0)
-		return rc;
-
 	pvt->addrmatch_dev = kzalloc(sizeof(*pvt->addrmatch_dev), GFP_KERNEL);
 	if (!pvt->addrmatch_dev)
 		return -ENOMEM;
@@ -1223,11 +1219,6 @@ static void i7core_delete_sysfs_devices(struct mem_ctl_info *mci)
 
 	edac_dbg(1, "\n");
 
-	device_remove_file(&mci->dev, &dev_attr_inject_section);
-	device_remove_file(&mci->dev, &dev_attr_inject_type);
-	device_remove_file(&mci->dev, &dev_attr_inject_eccmask);
-	device_remove_file(&mci->dev, &dev_attr_inject_enable);
-
 	if (!pvt->is_registered) {
 		put_device(pvt->chancounts_dev);
 		device_del(pvt->chancounts_dev);
@@ -2259,7 +2250,7 @@ static int i7core_register_mci(struct i7core_dev *i7core_dev)
 		enable_sdram_scrub_setting(mci);
 
 	/* add this new MC control structure to EDAC's list of MCs */
-	if (unlikely(edac_mc_add_mc(mci))) {
+	if (unlikely(edac_mc_add_mc_with_groups(mci, i7core_dev_groups))) {
 		edac_dbg(0, "MC: failed edac_mc_add_mc()\n");
 		/* FIXME: perhaps some code should go here that disables error
 		 * reporting if we just enabled it
-- 
2.2.2

[PATCH 6/8] EDAC: mpc85xx: Use static attribute groups for sysfs entries

[Takashi Iwai]

... instead of manual device_create_file() and device_remove_file()
calls.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/edac/mpc85xx_edac.c | 38 ++++++++------------------------------
 1 file changed, 8 insertions(+), 30 deletions(-)

diff --git a/drivers/edac/mpc85xx_edac.c b/drivers/edac/mpc85xx_edac.c
index ffb1a9a15ccd..4b93a9062161 100644
--- a/drivers/edac/mpc85xx_edac.c
+++ b/drivers/edac/mpc85xx_edac.c
@@ -134,29 +134,14 @@ DEVICE_ATTR(inject_data_lo, S_IRUGO | S_IWUSR,
 DEVICE_ATTR(inject_ctrl, S_IRUGO | S_IWUSR,
 	    mpc85xx_mc_inject_ctrl_show, mpc85xx_mc_inject_ctrl_store);
 
-static int mpc85xx_create_sysfs_attributes(struct mem_ctl_info *mci)
-{
-	int rc;
-
-	rc = device_create_file(&mci->dev, &dev_attr_inject_data_hi);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_inject_data_lo);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_inject_ctrl);
-	if (rc < 0)
-		return rc;
+static struct attribute *mpc85xx_dev_attrs[] = {
+	&dev_attr_inject_data_hi.attr,
+	&dev_attr_inject_data_lo.attr,
+	&dev_attr_inject_ctrl.attr,
+	NULL
+};
 
-	return 0;
-}
-
-static void mpc85xx_remove_sysfs_attributes(struct mem_ctl_info *mci)
-{
-	device_remove_file(&mci->dev, &dev_attr_inject_data_hi);
-	device_remove_file(&mci->dev, &dev_attr_inject_data_lo);
-	device_remove_file(&mci->dev, &dev_attr_inject_ctrl);
-}
+ATTRIBUTE_GROUPS(mpc85xx_dev);
 
 /**************************** PCI Err device ***************************/
 #ifdef CONFIG_PCI
@@ -1106,13 +1091,7 @@ static int mpc85xx_mc_err_probe(struct platform_device *op)
 	/* clear all error bits */
 	out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DETECT, ~0);
 
-	if (edac_mc_add_mc(mci)) {
-		edac_dbg(3, "failed edac_mc_add_mc()\n");
-		goto err;
-	}
-
-	if (mpc85xx_create_sysfs_attributes(mci)) {
-		edac_mc_del_mc(mci->pdev);
+	if (edac_mc_add_mc_with_groups(mci, mpc85xx_dev_groups)) {
 		edac_dbg(3, "failed edac_mc_add_mc()\n");
 		goto err;
 	}
@@ -1176,7 +1155,6 @@ static int mpc85xx_mc_err_remove(struct platform_device *op)
 		 orig_ddr_err_disable);
 	out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_SBE, orig_ddr_err_sbe);
 
-	mpc85xx_remove_sysfs_attributes(mci);
 	edac_mc_del_mc(&op->dev);
 	edac_mc_free(mci);
 	return 0;
-- 
2.2.2

[PATCH 7/8] EDAC: octeon: Use static attribute groups for sysfs entries

[Takashi Iwai]

... instead of manual device_create_file() and device_remove_file()
calls.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/edac/octeon_edac-lmc.c | 55 ++++++++++--------------------------------
 1 file changed, 13 insertions(+), 42 deletions(-)

diff --git a/drivers/edac/octeon_edac-lmc.c b/drivers/edac/octeon_edac-lmc.c
index 4bd10f94f068..bb19e0732681 100644
--- a/drivers/edac/octeon_edac-lmc.c
+++ b/drivers/edac/octeon_edac-lmc.c
@@ -209,35 +209,18 @@ static DEVICE_ATTR(row, S_IRUGO | S_IWUSR,
 static DEVICE_ATTR(col, S_IRUGO | S_IWUSR,
 		   octeon_mc_inject_col_show, octeon_mc_inject_col_store);
 
+static struct attribute *octeon_dev_attrs[] = {
+	&dev_attr_inject.attr,
+	&dev_attr_error_type.attr,
+	&dev_attr_dimm.attr,
+	&dev_attr_rank.attr,
+	&dev_attr_bank.attr,
+	&dev_attr_row.attr,
+	&dev_attr_col.attr,
+	NULL
+};
 
-static int octeon_set_mc_sysfs_attributes(struct mem_ctl_info *mci)
-{
-	int rc;
-
-	rc = device_create_file(&mci->dev, &dev_attr_inject);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_error_type);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_dimm);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_rank);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_bank);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_row);
-	if (rc < 0)
-		return rc;
-	rc = device_create_file(&mci->dev, &dev_attr_col);
-	if (rc < 0)
-		return rc;
-
-	return 0;
-}
+ATTRIBUTE_GROUPS(octeon_dev);
 
 static int octeon_lmc_edac_probe(struct platform_device *pdev)
 {
@@ -271,18 +254,12 @@ static int octeon_lmc_edac_probe(struct platform_device *pdev)
 		mci->ctl_name = "octeon-lmc-err";
 		mci->edac_check = octeon_lmc_edac_poll;
 
-		if (edac_mc_add_mc(mci)) {
+		if (edac_mc_add_mc_with_groups(mci, octeon_dev_groups)) {
 			dev_err(&pdev->dev, "edac_mc_add_mc() failed\n");
 			edac_mc_free(mci);
 			return -ENXIO;
 		}
 
-		if (octeon_set_mc_sysfs_attributes(mci)) {
-			dev_err(&pdev->dev, "octeon_set_mc_sysfs_attributes() failed\n");
-			return -ENXIO;
-		}
-
-
 		cfg0.u64 = cvmx_read_csr(CVMX_LMCX_MEM_CFG0(mc));
 		cfg0.s.intr_ded_ena = 0;	/* We poll */
 		cfg0.s.intr_sec_ena = 0;
@@ -309,18 +286,12 @@ static int octeon_lmc_edac_probe(struct platform_device *pdev)
 		mci->ctl_name = "co_lmc_err";
 		mci->edac_check = octeon_lmc_edac_poll_o2;
 
-		if (edac_mc_add_mc(mci)) {
+		if (edac_mc_add_mc_with_groups(mci, octeon_dev_groups)) {
 			dev_err(&pdev->dev, "edac_mc_add_mc() failed\n");
 			edac_mc_free(mci);
 			return -ENXIO;
 		}
 
-		if (octeon_set_mc_sysfs_attributes(mci)) {
-			dev_err(&pdev->dev, "octeon_set_mc_sysfs_attributes() failed\n");
-			return -ENXIO;
-		}
-
-
 		en.u64 = cvmx_read_csr(CVMX_LMCX_MEM_CFG0(mc));
 		en.s.intr_ded_ena = 0;	/* We poll */
 		en.s.intr_sec_ena = 0;
-- 
2.2.2

[PATCH 8/8] EDAC: highbank: Use static attribute groups for sysfs entries

[Takashi Iwai]

... instead of manual device_create_file() and device_remove_file()
calls.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/edac/highbank_mc_edac.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/edac/highbank_mc_edac.c b/drivers/edac/highbank_mc_edac.c
index f784de1dc793..475484718fb2 100644
--- a/drivers/edac/highbank_mc_edac.c
+++ b/drivers/edac/highbank_mc_edac.c
@@ -124,6 +124,13 @@ static ssize_t highbank_mc_inject_ctrl(struct device *dev,
 
 static DEVICE_ATTR(inject_ctrl, S_IWUSR, NULL, highbank_mc_inject_ctrl);
 
+static struct attribute *highbank_dev_attrs[] = {
+	&dev_attr_inject_ctrl.attr,
+	NULL
+};
+
+ATTRIBUTE_GROUPS(highbank_dev);
+
 struct hb_mc_settings {
 	int	err_offset;
 	int	int_offset;
@@ -231,7 +238,7 @@ static int highbank_mc_probe(struct platform_device *pdev)
 	dimm->mtype = MEM_DDR3;
 	dimm->edac_mode = EDAC_SECDED;
 
-	res = edac_mc_add_mc(mci);
+	res = edac_mc_add_mc_with_groups(mci, highbank_dev_groups);
 	if (res < 0)
 		goto err;
 
@@ -243,8 +250,6 @@ static int highbank_mc_probe(struct platform_device *pdev)
 		goto err2;
 	}
 
-	device_create_file(&mci->dev, &dev_attr_inject_ctrl);
-
 	devres_close_group(&pdev->dev, NULL);
 	return 0;
 err2:
@@ -259,7 +264,6 @@ static int highbank_mc_remove(struct platform_device *pdev)
 {
 	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
 
-	device_remove_file(&mci->dev, &dev_attr_inject_ctrl);
 	edac_mc_del_mc(&pdev->dev);
 	edac_mc_free(mci);
 	return 0;
-- 
2.2.2

Re: [PATCH 0/8] EDAC: Clean up device_create_file() & co

[Borislav Petkov]

On Wed, Feb 04, 2015 at 11:48:50AM +0100, Takashi Iwai wrote:
> Hi,
> 
> this is a series of cleanup patches to replace the manual
> device_create_file() and device_remove_file() calls with the static
> attribute groups.  This simplifies the code and also avoids the
> possible races between the device registration and sysfs creations.
> 
> Non-x86 driver have been only compile-tested.

Thanks Takashi, patchset queued for 3.21.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--