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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>
This commit is contained in:
Clemens Ladisch 2010-04-12 10:35:05 +02:00 committed by Stefan Richter
parent a2612cb16d
commit 3a1f0a0e3d
1 changed files with 3 additions and 1 deletions
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4
drivers/firewire/core-iso.c
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@ -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--;
}
}
}