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igc: Fix launchtime before start of cycle

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[ Upstream commit c1bca9ac0bcb355be11354c2e68bc7bf31f5ac5a ]

It is possible (verified on a running system) that frames are processed
by igc_tx_launchtime with a txtime before the start of the cycle
(baset_est).

However, the result of txtime - baset_est is written into a u32,
leading to a wrap around to a positive number. The following
launchtime > 0 check will only branch to executing launchtime = 0
if launchtime is already 0.

Fix it by using a s32 before checking launchtime > 0.

Fixes: db0b124f02ba ("igc: Enhance Qbv scheduling by using first flag bit")
Signed-off-by: Florian Kauer <florian.kauer@linutronix.de>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Florian Kauer 2023-06-14 16:07:13 +02:00 committed by Greg Kroah-Hartman
parent cdf5b9af92
commit c48e8ee81a
1 changed files with 1 additions and 1 deletions
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drivers/net/ethernet/intel/igc/igc_main.c
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@ -905,7 +905,7 @@ static __le32 igc_tx_launchtime(struct igc_ring *ring, ktime_t txtime,
ktime_t base_time = adapter->base_time;
ktime_t now = ktime_get_clocktai();
ktime_t baset_est, end_of_cycle;
u32 launchtime;
s32 launchtime;
s64 n;
n = div64_s64(ktime_sub_ns(now, base_time), cycle_time);