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md/raid5: make sure to_read and to_write never go negative.

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to_read and to_write are part of the result of analysing
a stripe before handling it.
Their use is to avoid some loops and tests if the values are
known to be zero.  Thus it is not a problem if they are a
little bit larger than they should be.

So decrementing them in handle_failed_stripe serves little value, and
due to races it could cause some loops to be skipped incorrectly.

So remove those decrements.

Reported-by: "Jianpeng Ma" <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-10-11 13:50:13 +11:00
parent a7854487cd
commit 1ed850f356
1 changed files with 1 additions and 4 deletions
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5
drivers/md/raid5.c
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@ -2507,10 +2507,8 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
bi = sh->dev[i].towrite;
sh->dev[i].towrite = NULL;
spin_unlock_irq(&sh->stripe_lock);
if (bi) {
s->to_write--;
if (bi)
bitmap_end = 1;
}
if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
wake_up(&conf->wait_for_overlap);
@ -2558,7 +2556,6 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
spin_unlock_irq(&sh->stripe_lock);
if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
wake_up(&conf->wait_for_overlap);
if (bi) s->to_read--;
while (bi && bi->bi_sector <
sh->dev[i].sector + STRIPE_SECTORS) {
struct bio *nextbi =