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mlxsw: spectrum_router: Remove inappropriate usage of WARN_ON()
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We should not trigger a warning when a memory allocation fails. Remove
the WARN_ON().

The warning is constantly triggered by syzkaller when it is injecting
faults:

[ 2230.758664] FAULT_INJECTION: forcing a failure.
[ 2230.758664] name failslab, interval 1, probability 0, space 0, times 0
[ 2230.762329] CPU: 3 PID: 1407 Comm: syz-executor.0 Not tainted 5.8.0-rc2+ #28
...
[ 2230.898175] WARNING: CPU: 3 PID: 1407 at drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:6265 mlxsw_sp_router_fib_event+0xfad/0x13e0
[ 2230.898179] Kernel panic - not syncing: panic_on_warn set ...
[ 2230.898183] CPU: 3 PID: 1407 Comm: syz-executor.0 Not tainted 5.8.0-rc2+ #28
[ 2230.898190] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014

Fixes: 3057224 ("mlxsw: spectrum_router: Implement FIB offload in deferred work")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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idosch authored and davem330 committed Jul 10, 2020
1 parent f9f41e3 commit d9d5420
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
Original file line number Diff line number Diff line change
Expand Up @@ -6262,7 +6262,7 @@ static int mlxsw_sp_router_fib_event(struct notifier_block *nb,
}

fib_work = kzalloc(sizeof(*fib_work), GFP_ATOMIC);
if (WARN_ON(!fib_work))
if (!fib_work)
return NOTIFY_BAD;

fib_work->mlxsw_sp = router->mlxsw_sp;
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