From: Clemens Ladisch <clemens@ladisch.de>
Date: Mon, 12 Apr 2010 08:35:05 +0000 (+0200)
Subject: firewire: core: fix retries calculation in iso manage_channel()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3a1f0a0e3d871e3d3e08a1429009992151becda8;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

firewire: core: fix retries calculation in iso manage_channel()

If there is a permanent error condition when communicating with the IRM,
after the sixth error, the retry variable will be decremented to -1.
If, in this case, the bits in channels_mask are not yet exhausted, the
next channel is retried 2^32 times.

To fix this, check that retry is never decremented beyond zero.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---

diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index 99c20f1b613a..34a513725c9e 100644
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -250,8 +250,10 @@ static int manage_channel(struct fw_card *card, int irm_id, int generation,
 
 			/* 1394-1995 IRM, fall through to retry. */
 		default:
-			if (retry--)
+			if (retry) {
+				retry--;
 				i--;
+			}
 		}
 	}