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authorNeilBrown <neilb@suse.de>2007-04-04 19:08:18 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-04-04 21:12:47 -0700
commit5792a2856a63cdc568e08a7d6f9b2413d9217b3e (patch)
tree042a09fbfdf75dac5efa3bf61c7d6c6dd4c6ba7f /drivers/md
parent456a09dce9ca9b0013cabcda918aee851a04471d (diff)
downloadop-kernel-dev-5792a2856a63cdc568e08a7d6f9b2413d9217b3e.zip
op-kernel-dev-5792a2856a63cdc568e08a7d6f9b2413d9217b3e.tar.gz
[PATCH] md: avoid a deadlock when removing a device from an md array via sysfs
A device can be removed from an md array via e.g. echo remove > /sys/block/md3/md/dev-sde/state This will try to remove the 'dev-sde' subtree which will deadlock since commit e7b0d26a86943370c04d6833c6edba2a72a6e240 With this patch we run the kobject_del via schedule_work so as to avoid the deadlock. Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2a9b6a0..509171c 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1378,6 +1378,12 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
return err;
}
+static void delayed_delete(struct work_struct *ws)
+{
+ mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
+ kobject_del(&rdev->kobj);
+}
+
static void unbind_rdev_from_array(mdk_rdev_t * rdev)
{
char b[BDEVNAME_SIZE];
@@ -1390,7 +1396,12 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev)
printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
rdev->mddev = NULL;
sysfs_remove_link(&rdev->kobj, "block");
- kobject_del(&rdev->kobj);
+
+ /* We need to delay this, otherwise we can deadlock when
+ * writing to 'remove' to "dev/state"
+ */
+ INIT_WORK(&rdev->del_work, delayed_delete);
+ schedule_work(&rdev->del_work);
}
/*
@@ -3389,6 +3400,9 @@ static int do_md_stop(mddev_t * mddev, int mode)
sysfs_remove_link(&mddev->kobj, nm);
}
+ /* make sure all delayed_delete calls have finished */
+ flush_scheduled_work();
+
export_array(mddev);
mddev->array_size = 0;
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