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* [PATCH v2] mtd: mtd_blkdevs: Get|Put mtd_device in add|del_mtd_blktrans
@ 2021-06-15  9:13 ` Zhihao Cheng
  0 siblings, 0 replies; 6+ messages in thread
From: Zhihao Cheng @ 2021-06-15  9:13 UTC (permalink / raw)
  To: miquel.raynal, richard, vigneshr, alexander.sverdlin,
	computersforpeace, maximlevitsky, David.Woodhouse
  Cc: linux-mtd, linux-kernel, chengzhihao1, yukuai3

There are two reasons to move mtd_device get|put operations into mtd
blktrans adding/deleting:

* Solve an AA-deadlock problem while formating mtd device to generate
  a ftl device.
  [<0>] blktrans_open+0x47/0x340            LOCK(mtd_table_mutex)
  [<0>] __blkdev_get+0x5b/0x3e0
  [<0>] blkdev_get_by_dev+0x18f/0x370
  [<0>] __device_add_disk+0x2db/0x700
  [<0>] device_add_disk+0x17/0x20
  [<0>] add_mtd_blktrans_dev+0x39e/0x6d0
  [<0>] ftl_add_mtd+0x792/0x908 [ftl]
  [<0>] register_mtd_blktrans+0xfb/0x170    LOCK(mtd_table_mutex)
  [<0>] ftl_tr_init+0x18/0x1000 [ftl]
  [<0>] do_one_initcall+0x71/0x330
  [<0>] do_init_module+0xa6/0x350

* Hold refcount of mtd device's module if mtd blktrans still exists.
  Module                  Size  Used by
  mtdblock               20480  0
  mtdram                 20480  0
  $ lsblk
  mtdblock0  31:0    0  64M  0 disk
  $ rmmod mtdram
  # mtd device is removed unexpectedly when mtdblock exists!
  $ lsmod
  Module                  Size  Used by
  mtdblock               20480  0
  $ lsblk
  // No mtdblock found !

Patched:
  Module                  Size  Used by
  mtdblock               20480  0
  mtdram                 20480  1
  $ lsblk
  mtdblock0  31:0    0  64M  0 disk
  $ rmmod mtdram        # EBUSY, and /dev/mtdblock0 still exists

, which works just like ubi/mtd:
  Module                  Size  Used by
  ubi                   380928  0
  mtdram                 20480  1

Fixes: 073db4a51ee43c ("mtd: fix: avoid race condition when ...")
Fixes: 008c751ec78587 ("mtd: allow to unload the mtdtrans module if ...")
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
---
 drivers/mtd/mtd_blkdevs.c | 25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index fb8e12d590a1..19a2870a097a 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -209,7 +209,6 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 	if (!dev)
 		return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
 
-	mutex_lock(&mtd_table_mutex);
 	mutex_lock(&dev->lock);
 
 	if (dev->open)
@@ -227,26 +226,18 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 			goto error_put;
 	}
 
-	ret = __get_mtd_device(dev->mtd);
-	if (ret)
-		goto error_release;
 	dev->file_mode = mode;
 
 unlock:
 	dev->open++;
 	mutex_unlock(&dev->lock);
-	mutex_unlock(&mtd_table_mutex);
 	blktrans_dev_put(dev);
 	return ret;
 
-error_release:
-	if (dev->tr->release)
-		dev->tr->release(dev);
 error_put:
 	module_put(dev->tr->owner);
 	kref_put(&dev->ref, blktrans_dev_release);
 	mutex_unlock(&dev->lock);
-	mutex_unlock(&mtd_table_mutex);
 	blktrans_dev_put(dev);
 	return ret;
 }
@@ -258,7 +249,6 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
 	if (!dev)
 		return;
 
-	mutex_lock(&mtd_table_mutex);
 	mutex_lock(&dev->lock);
 
 	if (--dev->open)
@@ -267,14 +257,10 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
 	kref_put(&dev->ref, blktrans_dev_release);
 	module_put(dev->tr->owner);
 
-	if (dev->mtd) {
-		if (dev->tr->release)
-			dev->tr->release(dev);
-		__put_mtd_device(dev->mtd);
-	}
+	if (dev->mtd && dev->tr->release)
+		dev->tr->release(dev);
 unlock:
 	mutex_unlock(&dev->lock);
-	mutex_unlock(&mtd_table_mutex);
 	blktrans_dev_put(dev);
 }
 
@@ -425,6 +411,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
 	}
 
 	gd->queue = new->rq;
+	__get_mtd_device(new->mtd);
 
 	if (new->readonly)
 		set_disk_ro(gd, 1);
@@ -474,15 +461,15 @@ int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
 	blk_mq_unquiesce_queue(old->rq);
 	blk_mq_unfreeze_queue(old->rq);
 
-	/* If the device is currently open, tell trans driver to close it,
-		then put mtd device, and don't touch it again */
+	/* If the device is currently open, tell trans driver to close it */
 	mutex_lock(&old->lock);
 	if (old->open) {
 		if (old->tr->release)
 			old->tr->release(old);
-		__put_mtd_device(old->mtd);
 	}
+	__put_mtd_device(old->mtd);
 
+	/* At that point, we don't touch the mtd anymore */
 	old->mtd = NULL;
 
 	mutex_unlock(&old->lock);
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [PATCH v2] mtd: mtd_blkdevs: Get|Put mtd_device in add|del_mtd_blktrans
@ 2021-06-15  9:13 ` Zhihao Cheng
  0 siblings, 0 replies; 6+ messages in thread
From: Zhihao Cheng @ 2021-06-15  9:13 UTC (permalink / raw)
  To: miquel.raynal, richard, vigneshr, alexander.sverdlin,
	computersforpeace, maximlevitsky, David.Woodhouse
  Cc: linux-mtd, linux-kernel, chengzhihao1, yukuai3

There are two reasons to move mtd_device get|put operations into mtd
blktrans adding/deleting:

* Solve an AA-deadlock problem while formating mtd device to generate
  a ftl device.
  [<0>] blktrans_open+0x47/0x340            LOCK(mtd_table_mutex)
  [<0>] __blkdev_get+0x5b/0x3e0
  [<0>] blkdev_get_by_dev+0x18f/0x370
  [<0>] __device_add_disk+0x2db/0x700
  [<0>] device_add_disk+0x17/0x20
  [<0>] add_mtd_blktrans_dev+0x39e/0x6d0
  [<0>] ftl_add_mtd+0x792/0x908 [ftl]
  [<0>] register_mtd_blktrans+0xfb/0x170    LOCK(mtd_table_mutex)
  [<0>] ftl_tr_init+0x18/0x1000 [ftl]
  [<0>] do_one_initcall+0x71/0x330
  [<0>] do_init_module+0xa6/0x350

* Hold refcount of mtd device's module if mtd blktrans still exists.
  Module                  Size  Used by
  mtdblock               20480  0
  mtdram                 20480  0
  $ lsblk
  mtdblock0  31:0    0  64M  0 disk
  $ rmmod mtdram
  # mtd device is removed unexpectedly when mtdblock exists!
  $ lsmod
  Module                  Size  Used by
  mtdblock               20480  0
  $ lsblk
  // No mtdblock found !

Patched:
  Module                  Size  Used by
  mtdblock               20480  0
  mtdram                 20480  1
  $ lsblk
  mtdblock0  31:0    0  64M  0 disk
  $ rmmod mtdram        # EBUSY, and /dev/mtdblock0 still exists

, which works just like ubi/mtd:
  Module                  Size  Used by
  ubi                   380928  0
  mtdram                 20480  1

Fixes: 073db4a51ee43c ("mtd: fix: avoid race condition when ...")
Fixes: 008c751ec78587 ("mtd: allow to unload the mtdtrans module if ...")
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
---
 drivers/mtd/mtd_blkdevs.c | 25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index fb8e12d590a1..19a2870a097a 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -209,7 +209,6 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 	if (!dev)
 		return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
 
-	mutex_lock(&mtd_table_mutex);
 	mutex_lock(&dev->lock);
 
 	if (dev->open)
@@ -227,26 +226,18 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 			goto error_put;
 	}
 
-	ret = __get_mtd_device(dev->mtd);
-	if (ret)
-		goto error_release;
 	dev->file_mode = mode;
 
 unlock:
 	dev->open++;
 	mutex_unlock(&dev->lock);
-	mutex_unlock(&mtd_table_mutex);
 	blktrans_dev_put(dev);
 	return ret;
 
-error_release:
-	if (dev->tr->release)
-		dev->tr->release(dev);
 error_put:
 	module_put(dev->tr->owner);
 	kref_put(&dev->ref, blktrans_dev_release);
 	mutex_unlock(&dev->lock);
-	mutex_unlock(&mtd_table_mutex);
 	blktrans_dev_put(dev);
 	return ret;
 }
@@ -258,7 +249,6 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
 	if (!dev)
 		return;
 
-	mutex_lock(&mtd_table_mutex);
 	mutex_lock(&dev->lock);
 
 	if (--dev->open)
@@ -267,14 +257,10 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
 	kref_put(&dev->ref, blktrans_dev_release);
 	module_put(dev->tr->owner);
 
-	if (dev->mtd) {
-		if (dev->tr->release)
-			dev->tr->release(dev);
-		__put_mtd_device(dev->mtd);
-	}
+	if (dev->mtd && dev->tr->release)
+		dev->tr->release(dev);
 unlock:
 	mutex_unlock(&dev->lock);
-	mutex_unlock(&mtd_table_mutex);
 	blktrans_dev_put(dev);
 }
 
@@ -425,6 +411,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
 	}
 
 	gd->queue = new->rq;
+	__get_mtd_device(new->mtd);
 
 	if (new->readonly)
 		set_disk_ro(gd, 1);
@@ -474,15 +461,15 @@ int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
 	blk_mq_unquiesce_queue(old->rq);
 	blk_mq_unfreeze_queue(old->rq);
 
-	/* If the device is currently open, tell trans driver to close it,
-		then put mtd device, and don't touch it again */
+	/* If the device is currently open, tell trans driver to close it */
 	mutex_lock(&old->lock);
 	if (old->open) {
 		if (old->tr->release)
 			old->tr->release(old);
-		__put_mtd_device(old->mtd);
 	}
+	__put_mtd_device(old->mtd);
 
+	/* At that point, we don't touch the mtd anymore */
 	old->mtd = NULL;
 
 	mutex_unlock(&old->lock);
-- 
2.31.1


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply related	[flat|nested] 6+ messages in thread
* Re: [PATCH v2] mtd: mtd_blkdevs: Get|Put mtd_device in add|del_mtd_blktrans
  2021-06-15  9:13 ` Zhihao Cheng
@ 2021-06-15  9:27   ` Alexander Sverdlin
  -1 siblings, 0 replies; 6+ messages in thread
From: Alexander Sverdlin @ 2021-06-15  9:27 UTC (permalink / raw)
  To: Zhihao Cheng, miquel.raynal, richard, vigneshr,
	computersforpeace, maximlevitsky, David.Woodhouse
  Cc: linux-mtd, linux-kernel, yukuai3

Hello!

On 15/06/2021 11:13, Zhihao Cheng wrote:
> There are two reasons to move mtd_device get|put operations into mtd
> blktrans adding/deleting:

...

> Fixes: 073db4a51ee43c ("mtd: fix: avoid race condition when ...")
> Fixes: 008c751ec78587 ("mtd: allow to unload the mtdtrans module if ...")
> Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>

Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>

> ---
>  drivers/mtd/mtd_blkdevs.c | 25 ++++++-------------------
>  1 file changed, 6 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
> index fb8e12d590a1..19a2870a097a 100644
> --- a/drivers/mtd/mtd_blkdevs.c
> +++ b/drivers/mtd/mtd_blkdevs.c
> @@ -209,7 +209,6 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
>  	if (!dev)
>  		return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
>  
> -	mutex_lock(&mtd_table_mutex);
>  	mutex_lock(&dev->lock);
>  
>  	if (dev->open)
> @@ -227,26 +226,18 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
>  			goto error_put;
>  	}
>  
> -	ret = __get_mtd_device(dev->mtd);
> -	if (ret)
> -		goto error_release;
>  	dev->file_mode = mode;
>  
>  unlock:
>  	dev->open++;
>  	mutex_unlock(&dev->lock);
> -	mutex_unlock(&mtd_table_mutex);
>  	blktrans_dev_put(dev);
>  	return ret;
>  
> -error_release:
> -	if (dev->tr->release)
> -		dev->tr->release(dev);
>  error_put:
>  	module_put(dev->tr->owner);
>  	kref_put(&dev->ref, blktrans_dev_release);
>  	mutex_unlock(&dev->lock);
> -	mutex_unlock(&mtd_table_mutex);
>  	blktrans_dev_put(dev);
>  	return ret;
>  }
> @@ -258,7 +249,6 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
>  	if (!dev)
>  		return;
>  
> -	mutex_lock(&mtd_table_mutex);
>  	mutex_lock(&dev->lock);
>  
>  	if (--dev->open)
> @@ -267,14 +257,10 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
>  	kref_put(&dev->ref, blktrans_dev_release);
>  	module_put(dev->tr->owner);
>  
> -	if (dev->mtd) {
> -		if (dev->tr->release)
> -			dev->tr->release(dev);
> -		__put_mtd_device(dev->mtd);
> -	}
> +	if (dev->mtd && dev->tr->release)
> +		dev->tr->release(dev);
>  unlock:
>  	mutex_unlock(&dev->lock);
> -	mutex_unlock(&mtd_table_mutex);
>  	blktrans_dev_put(dev);
>  }
>  
> @@ -425,6 +411,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
>  	}
>  
>  	gd->queue = new->rq;
> +	__get_mtd_device(new->mtd);
>  
>  	if (new->readonly)
>  		set_disk_ro(gd, 1);
> @@ -474,15 +461,15 @@ int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
>  	blk_mq_unquiesce_queue(old->rq);
>  	blk_mq_unfreeze_queue(old->rq);
>  
> -	/* If the device is currently open, tell trans driver to close it,
> -		then put mtd device, and don't touch it again */
> +	/* If the device is currently open, tell trans driver to close it */
>  	mutex_lock(&old->lock);
>  	if (old->open) {
>  		if (old->tr->release)
>  			old->tr->release(old);
> -		__put_mtd_device(old->mtd);
>  	}
> +	__put_mtd_device(old->mtd);
>  
> +	/* At that point, we don't touch the mtd anymore */
>  	old->mtd = NULL;
>  
>  	mutex_unlock(&old->lock);

-- 
Best regards,
Alexander Sverdlin.

^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [PATCH v2] mtd: mtd_blkdevs: Get|Put mtd_device in add|del_mtd_blktrans
@ 2021-06-15  9:27   ` Alexander Sverdlin
  0 siblings, 0 replies; 6+ messages in thread
From: Alexander Sverdlin @ 2021-06-15  9:27 UTC (permalink / raw)
  To: Zhihao Cheng, miquel.raynal, richard, vigneshr,
	computersforpeace, maximlevitsky, David.Woodhouse
  Cc: linux-mtd, linux-kernel, yukuai3

Hello!

On 15/06/2021 11:13, Zhihao Cheng wrote:
> There are two reasons to move mtd_device get|put operations into mtd
> blktrans adding/deleting:

...

> Fixes: 073db4a51ee43c ("mtd: fix: avoid race condition when ...")
> Fixes: 008c751ec78587 ("mtd: allow to unload the mtdtrans module if ...")
> Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>

Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>

> ---
>  drivers/mtd/mtd_blkdevs.c | 25 ++++++-------------------
>  1 file changed, 6 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
> index fb8e12d590a1..19a2870a097a 100644
> --- a/drivers/mtd/mtd_blkdevs.c
> +++ b/drivers/mtd/mtd_blkdevs.c
> @@ -209,7 +209,6 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
>  	if (!dev)
>  		return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
>  
> -	mutex_lock(&mtd_table_mutex);
>  	mutex_lock(&dev->lock);
>  
>  	if (dev->open)
> @@ -227,26 +226,18 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
>  			goto error_put;
>  	}
>  
> -	ret = __get_mtd_device(dev->mtd);
> -	if (ret)
> -		goto error_release;
>  	dev->file_mode = mode;
>  
>  unlock:
>  	dev->open++;
>  	mutex_unlock(&dev->lock);
> -	mutex_unlock(&mtd_table_mutex);
>  	blktrans_dev_put(dev);
>  	return ret;
>  
> -error_release:
> -	if (dev->tr->release)
> -		dev->tr->release(dev);
>  error_put:
>  	module_put(dev->tr->owner);
>  	kref_put(&dev->ref, blktrans_dev_release);
>  	mutex_unlock(&dev->lock);
> -	mutex_unlock(&mtd_table_mutex);
>  	blktrans_dev_put(dev);
>  	return ret;
>  }
> @@ -258,7 +249,6 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
>  	if (!dev)
>  		return;
>  
> -	mutex_lock(&mtd_table_mutex);
>  	mutex_lock(&dev->lock);
>  
>  	if (--dev->open)
> @@ -267,14 +257,10 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
>  	kref_put(&dev->ref, blktrans_dev_release);
>  	module_put(dev->tr->owner);
>  
> -	if (dev->mtd) {
> -		if (dev->tr->release)
> -			dev->tr->release(dev);
> -		__put_mtd_device(dev->mtd);
> -	}
> +	if (dev->mtd && dev->tr->release)
> +		dev->tr->release(dev);
>  unlock:
>  	mutex_unlock(&dev->lock);
> -	mutex_unlock(&mtd_table_mutex);
>  	blktrans_dev_put(dev);
>  }
>  
> @@ -425,6 +411,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
>  	}
>  
>  	gd->queue = new->rq;
> +	__get_mtd_device(new->mtd);
>  
>  	if (new->readonly)
>  		set_disk_ro(gd, 1);
> @@ -474,15 +461,15 @@ int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
>  	blk_mq_unquiesce_queue(old->rq);
>  	blk_mq_unfreeze_queue(old->rq);
>  
> -	/* If the device is currently open, tell trans driver to close it,
> -		then put mtd device, and don't touch it again */
> +	/* If the device is currently open, tell trans driver to close it */
>  	mutex_lock(&old->lock);
>  	if (old->open) {
>  		if (old->tr->release)
>  			old->tr->release(old);
> -		__put_mtd_device(old->mtd);
>  	}
> +	__put_mtd_device(old->mtd);
>  
> +	/* At that point, we don't touch the mtd anymore */
>  	old->mtd = NULL;
>  
>  	mutex_unlock(&old->lock);

-- 
Best regards,
Alexander Sverdlin.

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [PATCH v2] mtd: mtd_blkdevs: Get|Put mtd_device in add|del_mtd_blktrans
  2021-06-15  9:27   ` Alexander Sverdlin
@ 2021-07-12 13:36     ` Zhihao Cheng
  -1 siblings, 0 replies; 6+ messages in thread
From: Zhihao Cheng @ 2021-07-12 13:36 UTC (permalink / raw)
  To: Alexander Sverdlin, miquel.raynal, richard, vigneshr,
	computersforpeace, maximlevitsky, David.Woodhouse
  Cc: linux-mtd, linux-kernel, yukuai3

在 2021/6/15 17:27, Alexander Sverdlin 写道:
> Hello!
>
> On 15/06/2021 11:13, Zhihao Cheng wrote:
>> There are two reasons to move mtd_device get|put operations into mtd
>> blktrans adding/deleting:
> ...
>
>> Fixes: 073db4a51ee43c ("mtd: fix: avoid race condition when ...")
>> Fixes: 008c751ec78587 ("mtd: allow to unload the mtdtrans module if ...")
>> Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
> Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
friendly ping



^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [PATCH v2] mtd: mtd_blkdevs: Get|Put mtd_device in add|del_mtd_blktrans
@ 2021-07-12 13:36     ` Zhihao Cheng
  0 siblings, 0 replies; 6+ messages in thread
From: Zhihao Cheng @ 2021-07-12 13:36 UTC (permalink / raw)
  To: Alexander Sverdlin, miquel.raynal, richard, vigneshr,
	computersforpeace, maximlevitsky, David.Woodhouse
  Cc: linux-mtd, linux-kernel, yukuai3

在 2021/6/15 17:27, Alexander Sverdlin 写道:
> Hello!
>
> On 15/06/2021 11:13, Zhihao Cheng wrote:
>> There are two reasons to move mtd_device get|put operations into mtd
>> blktrans adding/deleting:
> ...
>
>> Fixes: 073db4a51ee43c ("mtd: fix: avoid race condition when ...")
>> Fixes: 008c751ec78587 ("mtd: allow to unload the mtdtrans module if ...")
>> Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
> Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
friendly ping



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^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-07-12 13:37 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-15  9:13 [PATCH v2] mtd: mtd_blkdevs: Get|Put mtd_device in add|del_mtd_blktrans Zhihao Cheng
2021-06-15  9:13 ` Zhihao Cheng
2021-06-15  9:27 ` Alexander Sverdlin
2021-06-15  9:27   ` Alexander Sverdlin
2021-07-12 13:36   ` Zhihao Cheng
2021-07-12 13:36     ` Zhihao Cheng

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