3.16.7-ckt15 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Brian Norris <computersforpe...@gmail.com>
commit 073db4a51ee43ccb827f54a4261c0583b028d5ab upstream.
On A MIPS 32-cores machine a BUG_ON was triggered because some acesses to
mtd->usecount were done without taking mtd_table_mutex.
kernel: Call Trace:
kernel: [<ffffffff80401818>] __put_mtd_device+0x20/0x50
kernel: [<ffffffff804086f4>] blktrans_release+0x8c/0xd8
kernel: [<ffffffff802577e0>] __blkdev_put+0x1a8/0x200
kernel: [<ffffffff802579a4>] blkdev_close+0x1c/0x30
kernel: [<ffffffff8022006c>] __fput+0xac/0x250
kernel: [<ffffffff80171208>] task_work_run+0xd8/0x120
kernel: [<ffffffff8012c23c>] work_notifysig+0x10/0x18
kernel:
kernel:
Code: 2442ffff ac8202d8 000217fe <00020336> dc820128 10400003
00000000 0040f809 00000000
kernel: ---[ end trace 080fbb4579b47a73 ]---
Fixed by taking the mutex in blktrans_open and blktrans_release.
Note that this locking is already suggested in
include/linux/mtd/blktrans.h:
struct mtd_blktrans_ops {
...
/* Called with mtd_table_mutex held; no race with add/remove */
int (*open)(struct mtd_blktrans_dev *dev);
void (*release)(struct mtd_blktrans_dev *dev);
...
};
But we weren't following it.
Originally reported by (and patched by) Zhang and Giuseppe,
independently. Improved and rewritten.
Reported-by: Zhang Xingcai <zhangxing...@huawei.com>
Reported-by: Giuseppe Cantavenera <giuseppe.cantavenera....@nokia.com>
Tested-by: Giuseppe Cantavenera <giuseppe.cantavenera....@nokia.com>
Acked-by: Alexander Sverdlin <alexander.sverd...@nokia.com>
Signed-off-by: Brian Norris <computersforpe...@gmail.com>
Signed-off-by: Luis Henriques <luis.henriq...@canonical.com>
---
drivers/mtd/mtd_blkdevs.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 43e30992a369..7266a318628c 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -200,6 +200,7 @@ static int blktrans_open(struct block_device *bdev, fmode_t
mode)
return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
mutex_lock(&dev->lock);
+ mutex_lock(&mtd_table_mutex);
if (dev->open)
goto unlock;
@@ -223,6 +224,7 @@ static int blktrans_open(struct block_device *bdev, fmode_t
mode)
unlock:
dev->open++;
+ mutex_unlock(&mtd_table_mutex);
mutex_unlock(&dev->lock);
blktrans_dev_put(dev);
return ret;
@@ -233,6 +235,7 @@ error_release:
error_put:
module_put(dev->tr->owner);
kref_put(&dev->ref, blktrans_dev_release);
+ mutex_unlock(&mtd_table_mutex);
mutex_unlock(&dev->lock);
blktrans_dev_put(dev);
return ret;
@@ -246,6 +249,7 @@ static void blktrans_release(struct gendisk *disk, fmode_t
mode)
return;
mutex_lock(&dev->lock);
+ mutex_lock(&mtd_table_mutex);
if (--dev->open)
goto unlock;
@@ -259,6 +263,7 @@ static void blktrans_release(struct gendisk *disk, fmode_t
mode)
__put_mtd_device(dev->mtd);
}
unlock:
+ mutex_unlock(&mtd_table_mutex);
mutex_unlock(&dev->lock);
blktrans_dev_put(dev);
}
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