From: NeilBrown <neilb@suse.de>
Date: Thu, 11 Oct 2012 02:50:12 +0000 (+1100)
Subject: md/raid5: protect debug message against NULL derefernce.
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=b97390aec4756373168ad2976e1f117b610513ea;p=openwrt%2Fstaging%2Fblogic.git

md/raid5: protect debug message against NULL derefernce.

The pr_debug in add_stripe_bio could race with something
changing *bip, so it is best to hold the lock until
after the pr_debug.

Reported-by: "Jianpeng Ma" <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 36c0a158730b..d11012604e28 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2436,11 +2436,11 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
 		if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS)
 			set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags);
 	}
-	spin_unlock_irq(&sh->stripe_lock);
 
 	pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n",
 		(unsigned long long)(*bip)->bi_sector,
 		(unsigned long long)sh->sector, dd_idx);
+	spin_unlock_irq(&sh->stripe_lock);
 
 	if (conf->mddev->bitmap && firstwrite) {
 		bitmap_startwrite(conf->mddev->bitmap, sh->sector,