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dm crypt: use cond_resched 

Add cond_resched() to prevent monopolising CPU when processing large bios.

dm-crypt processes encryption of bios in sector units.  If the bio request
is big it can spend a long time in the encryption call.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Tested-by: Yan Li <elliot.li.tech@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Milan Broz 2008-07-02 09:34:28 +01:00 committed by Alasdair G Kergon
parent e1441b9a41
commit c7f1b20441
1 changed files with 1 additions and 0 deletions
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1
drivers/md/dm-crypt.c
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@ -432,6 +432,7 @@ static int crypt_convert(struct crypt_config *cc,
case 0:
atomic_dec(&ctx->pending);
ctx->sector++;
cond_resched();
continue;
/* error */