diff options
| author | NeilBrown <neilb@suse.de> | 2006-07-10 13:44:15 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-10 22:24:16 +0200 |
| commit | 0b8c9de05c2a860fe6b02fedcb48763bcee648b3 (patch) | |
| tree | 893228041dfcc44a216a6887e75c2424e0a8bca9 | |
| parent | [PATCH] md: set desc_nr correctly for version-1 superblocks (diff) | |
| download | linux-0b8c9de05c2a860fe6b02fedcb48763bcee648b3.tar.xz linux-0b8c9de05c2a860fe6b02fedcb48763bcee648b3.zip | |
[PATCH] md: delay starting md threads until array is completely setup
When an array is started we start one or two threads (two if there is a
reshape or recovery that needs to be completed).
We currently start these *before* the array is completely set up and in
particular before queue->queuedata is set. If the thread actually starts
very quickly on another CPU, we can end up dereferencing queue->queuedata
and oops.
This patch also makes sure we don't try to start a recovery if a reshape is
being restarted.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | drivers/md/md.c | 8 | ||||
| -rw-r--r-- | drivers/md/raid5.c | 3 |
2 files changed, 4 insertions, 7 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 9f76e0cd7805..fb50e5642c63 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -3095,7 +3095,6 @@ static int do_md_run(mddev_t * mddev) } set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); if (mddev->sb_dirty) md_update_sb(mddev); @@ -3116,7 +3115,7 @@ static int do_md_run(mddev_t * mddev) * start recovery here. If we leave it to md_check_recovery, * it will remove the drives and not do the right thing */ - if (mddev->degraded) { + if (mddev->degraded && !mddev->sync_thread) { struct list_head *rtmp; int spares = 0; ITERATE_RDEV(mddev,rdev,rtmp) @@ -3137,10 +3136,11 @@ static int do_md_run(mddev_t * mddev) mdname(mddev)); /* leave the spares where they are, it shouldn't hurt */ mddev->recovery = 0; - } else - md_wakeup_thread(mddev->sync_thread); + } } } + md_wakeup_thread(mddev->thread); + md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ mddev->changed = 1; md_new_event(mddev); diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 5764387c6989..a02f35f1a796 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3246,9 +3246,6 @@ static int run(mddev_t *mddev) set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); mddev->sync_thread = md_register_thread(md_do_sync, mddev, "%s_reshape"); - /* FIXME if md_register_thread fails?? */ - md_wakeup_thread(mddev->sync_thread); - } /* read-ahead size must cover two whole stripes, which is |