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* [PATCH 1/2] libnvdimm: simplify nvdimm_remove()
@ 2021-02-12 17:10 Uwe Kleine-König
  2021-02-12 17:10 ` [PATCH 2/2] libnvdimm: Make remove callback return void Uwe Kleine-König
  2021-02-17  1:40 ` [PATCH 1/2] libnvdimm: simplify nvdimm_remove() Dan Williams
  0 siblings, 2 replies; 4+ messages in thread
From: Uwe Kleine-König @ 2021-02-12 17:10 UTC (permalink / raw)
  To: Dan Williams, Vishal Verma, Dave Jiang, Ira Weiny
  Cc: Andrew Morton, Greg Kroah-Hartman, kernel, linux-nvdimm, linux-kernel

nvdimm_remove is only ever called after nvdimm_probe() returned
successfully. In this case driver data is always set to a non-NULL value
so the check for driver data being NULL can go away as it's always false.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/nvdimm/dimm.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
index 7d4ddc4d9322..94be3ae1d29f 100644
--- a/drivers/nvdimm/dimm.c
+++ b/drivers/nvdimm/dimm.c
@@ -117,9 +117,6 @@ static int nvdimm_remove(struct device *dev)
 {
 	struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
 
-	if (!ndd)
-		return 0;
-
 	nvdimm_bus_lock(dev);
 	dev_set_drvdata(dev, NULL);
 	nvdimm_bus_unlock(dev);

base-commit: 5c8fe583cce542aa0b84adc939ce85293de36e5e
-- 
2.29.2
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^ permalink raw reply related	[flat|nested] 4+ messages in thread

* [PATCH 2/2] libnvdimm: Make remove callback return void
  2021-02-12 17:10 [PATCH 1/2] libnvdimm: simplify nvdimm_remove() Uwe Kleine-König
@ 2021-02-12 17:10 ` Uwe Kleine-König
  2021-02-17  3:37   ` Dan Williams
  2021-02-17  1:40 ` [PATCH 1/2] libnvdimm: simplify nvdimm_remove() Dan Williams
  1 sibling, 1 reply; 4+ messages in thread
From: Uwe Kleine-König @ 2021-02-12 17:10 UTC (permalink / raw)
  To: Dan Williams, Vishal Verma, Dave Jiang, Ira Weiny
  Cc: Andrew Morton, Greg Kroah-Hartman, kernel, linux-nvdimm, linux-kernel

All drivers return 0 in their remove callback and the driver core ignores
the return value of nvdimm_bus_remove() anyhow. So simplify by changing
the driver remove callback to return void and return 0 unconditionally
to the upper layer.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/dax/pmem/compat.c |  3 +--
 drivers/nvdimm/blk.c      |  3 +--
 drivers/nvdimm/bus.c      | 13 +++++--------
 drivers/nvdimm/dimm.c     |  4 +---
 drivers/nvdimm/pmem.c     |  4 +---
 drivers/nvdimm/region.c   |  4 +---
 include/linux/nd.h        |  2 +-
 7 files changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/dax/pmem/compat.c b/drivers/dax/pmem/compat.c
index 863c114fd88c..d81dc35fd65d 100644
--- a/drivers/dax/pmem/compat.c
+++ b/drivers/dax/pmem/compat.c
@@ -41,10 +41,9 @@ static int dax_pmem_compat_release(struct device *dev, void *data)
 	return 0;
 }
 
-static int dax_pmem_compat_remove(struct device *dev)
+static void dax_pmem_compat_remove(struct device *dev)
 {
 	device_for_each_child(dev, NULL, dax_pmem_compat_release);
-	return 0;
 }
 
 static struct nd_device_driver dax_pmem_compat_driver = {
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index 22e5617b2cea..8a53728e13e6 100644
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -310,11 +310,10 @@ static int nd_blk_probe(struct device *dev)
 		return nsblk_attach_disk(nsblk);
 }
 
-static int nd_blk_remove(struct device *dev)
+static void nd_blk_remove(struct device *dev)
 {
 	if (is_nd_btt(dev))
 		nvdimm_namespace_detach_btt(to_nd_btt(dev));
-	return 0;
 }
 
 static struct nd_device_driver nd_blk_driver = {
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 2304c6183822..48f0985ca8a0 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -113,18 +113,17 @@ static int nvdimm_bus_remove(struct device *dev)
 	struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
 	struct module *provider = to_bus_provider(dev);
 	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
-	int rc = 0;
 
 	if (nd_drv->remove) {
 		debug_nvdimm_lock(dev);
-		rc = nd_drv->remove(dev);
+		nd_drv->remove(dev);
 		debug_nvdimm_unlock(dev);
 	}
 
-	dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
-			dev_name(dev), rc);
+	dev_dbg(&nvdimm_bus->dev, "%s.remove(%s)\n", dev->driver->name,
+			dev_name(dev));
 	module_put(provider);
-	return rc;
+	return 0;
 }
 
 static void nvdimm_bus_shutdown(struct device *dev)
@@ -427,7 +426,7 @@ static void free_badrange_list(struct list_head *badrange_list)
 	list_del_init(badrange_list);
 }
 
-static int nd_bus_remove(struct device *dev)
+static void nd_bus_remove(struct device *dev)
 {
 	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
 
@@ -446,8 +445,6 @@ static int nd_bus_remove(struct device *dev)
 	spin_unlock(&nvdimm_bus->badrange.lock);
 
 	nvdimm_bus_destroy_ndctl(nvdimm_bus);
-
-	return 0;
 }
 
 static int nd_bus_probe(struct device *dev)
diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
index 94be3ae1d29f..91d9163ee303 100644
--- a/drivers/nvdimm/dimm.c
+++ b/drivers/nvdimm/dimm.c
@@ -113,7 +113,7 @@ static int nvdimm_probe(struct device *dev)
 	return rc;
 }
 
-static int nvdimm_remove(struct device *dev)
+static void nvdimm_remove(struct device *dev)
 {
 	struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
 
@@ -121,8 +121,6 @@ static int nvdimm_remove(struct device *dev)
 	dev_set_drvdata(dev, NULL);
 	nvdimm_bus_unlock(dev);
 	put_ndd(ndd);
-
-	return 0;
 }
 
 static struct nd_device_driver nvdimm_driver = {
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 875076b0ea6c..062f0f22bac9 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -564,7 +564,7 @@ static int nd_pmem_probe(struct device *dev)
 	return pmem_attach_disk(dev, ndns);
 }
 
-static int nd_pmem_remove(struct device *dev)
+static void nd_pmem_remove(struct device *dev)
 {
 	struct pmem_device *pmem = dev_get_drvdata(dev);
 
@@ -579,8 +579,6 @@ static int nd_pmem_remove(struct device *dev)
 		pmem->bb_state = NULL;
 	}
 	nvdimm_flush(to_nd_region(dev->parent), NULL);
-
-	return 0;
 }
 
 static void nd_pmem_shutdown(struct device *dev)
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
index bfce87ed72ab..e0c34120df37 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -87,7 +87,7 @@ static int child_unregister(struct device *dev, void *data)
 	return 0;
 }
 
-static int nd_region_remove(struct device *dev)
+static void nd_region_remove(struct device *dev)
 {
 	struct nd_region *nd_region = to_nd_region(dev);
 
@@ -108,8 +108,6 @@ static int nd_region_remove(struct device *dev)
 	 */
 	sysfs_put(nd_region->bb_state);
 	nd_region->bb_state = NULL;
-
-	return 0;
 }
 
 static int child_notify(struct device *dev, void *data)
diff --git a/include/linux/nd.h b/include/linux/nd.h
index 55c735997805..cec526c8043d 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -26,7 +26,7 @@ struct nd_device_driver {
 	struct device_driver drv;
 	unsigned long type;
 	int (*probe)(struct device *dev);
-	int (*remove)(struct device *dev);
+	void (*remove)(struct device *dev);
 	void (*shutdown)(struct device *dev);
 	void (*notify)(struct device *dev, enum nvdimm_event event);
 };
-- 
2.29.2
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^ permalink raw reply related	[flat|nested] 4+ messages in thread

* Re: [PATCH 1/2] libnvdimm: simplify nvdimm_remove()
  2021-02-12 17:10 [PATCH 1/2] libnvdimm: simplify nvdimm_remove() Uwe Kleine-König
  2021-02-12 17:10 ` [PATCH 2/2] libnvdimm: Make remove callback return void Uwe Kleine-König
@ 2021-02-17  1:40 ` Dan Williams
  1 sibling, 0 replies; 4+ messages in thread
From: Dan Williams @ 2021-02-17  1:40 UTC (permalink / raw)
  To: Uwe Kleine-König
  Cc: Andrew Morton, Greg Kroah-Hartman, kernel, linux-nvdimm,
	Linux Kernel Mailing List

On Fri, Feb 12, 2021 at 9:11 AM Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
>
> nvdimm_remove is only ever called after nvdimm_probe() returned
> successfully. In this case driver data is always set to a non-NULL value
> so the check for driver data being NULL can go away as it's always false.

Looks good, thanks.
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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH 2/2] libnvdimm: Make remove callback return void
  2021-02-12 17:10 ` [PATCH 2/2] libnvdimm: Make remove callback return void Uwe Kleine-König
@ 2021-02-17  3:37   ` Dan Williams
  0 siblings, 0 replies; 4+ messages in thread
From: Dan Williams @ 2021-02-17  3:37 UTC (permalink / raw)
  To: Uwe Kleine-König
  Cc: Andrew Morton, Greg Kroah-Hartman, kernel, linux-nvdimm,
	Linux Kernel Mailing List

On Fri, Feb 12, 2021 at 9:21 AM Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
>
> All drivers return 0 in their remove callback and the driver core ignores
> the return value of nvdimm_bus_remove() anyhow. So simplify by changing
> the driver remove callback to return void and return 0 unconditionally
> to the upper layer.

Looks good, thanks.
_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-02-17  3:38 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-02-12 17:10 [PATCH 1/2] libnvdimm: simplify nvdimm_remove() Uwe Kleine-König
2021-02-12 17:10 ` [PATCH 2/2] libnvdimm: Make remove callback return void Uwe Kleine-König
2021-02-17  3:37   ` Dan Williams
2021-02-17  1:40 ` [PATCH 1/2] libnvdimm: simplify nvdimm_remove() Dan Williams

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