From: Shaohua Li Date: Sun, 20 May 2012 23:26:59 +0000 (+1000) Subject: md: using GFP_NOIO to allocate bio for flush request X-Git-Tag: v3.5-rc1~110^2~55 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=b5e1b8cee7ad58a15d2fa79bcd7946acb592602d;p=linux.git md: using GFP_NOIO to allocate bio for flush request A flush request is usually issued in transaction commit code path, so using GFP_KERNEL to allocate memory for flush request bio falls into the classic deadlock issue. This is suitable for any -stable kernel to which it applies as it avoids a possible deadlock. Cc: stable@vger.kernel.org Signed-off-by: Shaohua Li Signed-off-by: NeilBrown --- diff --git a/drivers/md/md.c b/drivers/md/md.c index 01233d855eb2..2b30ffdb81b2 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -452,7 +452,7 @@ static void submit_flushes(struct work_struct *ws) atomic_inc(&rdev->nr_pending); atomic_inc(&rdev->nr_pending); rcu_read_unlock(); - bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev); + bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); bi->bi_end_io = md_end_flush; bi->bi_private = rdev; bi->bi_bdev = rdev->bdev;