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authorMilan Broz <mbroz@redhat.com>2008-07-02 09:34:28 +0100
committerAlasdair G Kergon <agk@redhat.com>2008-07-02 09:34:28 +0100
commitc7f1b2044191a82e7f0a1a674751ed582289e2e0 (patch)
treec200c19aca2faf22ad5c8636a3a783f8e26ef289
parente1441b9a41c33aa9236008a7cfe49a8e723fb397 (diff)
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>
-rw-r--r--drivers/md/dm-crypt.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 835def11419d..ab6a61db63ce 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -432,6 +432,7 @@ static int crypt_convert(struct crypt_config *cc,
case 0:
atomic_dec(&ctx->pending);
ctx->sector++;
+ cond_resched();
continue;
/* error */