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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-30 14:11:12 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-30 14:11:12 -0800
commitbcdddfb66cc998252d34758ce4109cedc0d24a5c (patch)
tree8cea3d0275dce00f12b8b4ac853fac6841a1c6b9
parent0f2452855d86901ba3766826ccb5606ea4e15ab9 (diff)
downloadlinux-2.6.34-ux500-bcdddfb66cc998252d34758ce4109cedc0d24a5c.tar.gz
Revert "net: ifb error path loop fix"
This reverts commit 0c0b3ae68ec93b1db5c637d294647d1cca0df763. Quoth David: "Jeff, please revert It's wrong. We had a lengthy analysis of this piece of code several months ago, and it is correct. Consider, if we run the loop and we get an error the following happens: 1) attempt of ifb_init_one(i) fails, therefore we should not try to "ifb_free_one()" on "i" since it failed 2) the loop iteration first increments "i", then it check for error Therefore we must decrement "i" twice before the first free during the cleanup. One to "undo" the for() loop increment, and one to "skip" the ifb_init_one() case which failed." Reported-by: David Miller <davem@davemloft.net> Acked-by: Jeff Garzik <jgarzik@pobox.com> Cc: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/net/ifb.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index c4ca7c930a4..ca2b21f9d44 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -271,7 +271,8 @@ static int __init ifb_init_module(void)
for (i = 0; i < numifbs && !err; i++)
err = ifb_init_one(i);
if (err) {
- while (i--)
+ i--;
+ while (--i >= 0)
ifb_free_one(i);
}