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authorNeilBrown <neilb@suse.de>2011-09-21 15:30:20 +1000
committerNeilBrown <neilb@suse.de>2011-09-21 15:30:20 +1000
commit01f96c0a9922cd9919baf9d16febdf7016177a12 (patch)
treea877fe509c4ef0db5252b7192df56009c1d06d6f /drivers/md/md.h
parent27a7b260f71439c40546b43588448faac01adb93 (diff)
md: Avoid waking up a thread after it has been freed.
Two related problems: 1/ some error paths call "md_unregister_thread(mddev->thread)" without subsequently clearing ->thread. A subsequent call to mddev_unlock will try to wake the thread, and crash. 2/ Most calls to md_wakeup_thread are protected against the thread disappeared either by: - holding the ->mutex - having an active request, so something else must be keeping the array active. However mddev_unlock calls md_wakeup_thread after dropping the mutex and without any certainty of an active request, so the ->thread could theoretically disappear. So we need a spinlock to provide some protections. So change md_unregister_thread to take a pointer to the thread pointer, and ensure that it always does the required locking, and clears the pointer properly. Reported-by: "Moshe Melnikov" <moshe@zadarastorage.com> Signed-off-by: NeilBrown <neilb@suse.de> cc: stable@kernel.org
Diffstat (limited to 'drivers/md/md.h')
-rw-r--r--drivers/md/md.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 1e586bb4452e..0a309dc29b45 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -560,7 +560,7 @@ extern int register_md_personality(struct mdk_personality *p);
extern int unregister_md_personality(struct mdk_personality *p);
extern mdk_thread_t * md_register_thread(void (*run) (mddev_t *mddev),
mddev_t *mddev, const char *name);
-extern void md_unregister_thread(mdk_thread_t *thread);
+extern void md_unregister_thread(mdk_thread_t **threadp);
extern void md_wakeup_thread(mdk_thread_t *thread);
extern void md_check_recovery(mddev_t *mddev);
extern void md_write_start(mddev_t *mddev, struct bio *bi);