Re: [PATCH iwl-net v1] ixgbe: initialize aci.lock before it's used

[Simon Horman <horms@kernel.org>]

On Mon, Jun 16, 2025 at 03:36:36PM +0200, Jedrzej Jagielski wrote:
> Currently aci.lock is initialized too late. A bunch of ACI callbacks
> using the lock are called prior it's initialized.
> 
> Commit 337369f8ce9e ("locking/mutex: Add MUTEX_WARN_ON() into fast path")
> highlights that issue what results in call trace.
> 
> [    4.092899] DEBUG_LOCKS_WARN_ON(lock->magic != lock)
> [    4.092910] WARNING: CPU: 0 PID: 578 at kernel/locking/mutex.c:154 mutex_lock+0x6d/0x80
> [    4.098757] Call Trace:
> [    4.098847]  <TASK>
> [    4.098922]  ixgbe_aci_send_cmd+0x8c/0x1e0 [ixgbe]
> [    4.099108]  ? hrtimer_try_to_cancel+0x18/0x110
> [    4.099277]  ixgbe_aci_get_fw_ver+0x52/0xa0 [ixgbe]
> [    4.099460]  ixgbe_check_fw_error+0x1fc/0x2f0 [ixgbe]
> [    4.099650]  ? usleep_range_state+0x69/0xd0
> [    4.099811]  ? usleep_range_state+0x8c/0xd0
> [    4.099964]  ixgbe_probe+0x3b0/0x12d0 [ixgbe]
> [    4.100132]  local_pci_probe+0x43/0xa0
> [    4.100267]  work_for_cpu_fn+0x13/0x20
> [    4.101647]  </TASK>
> 
> Move aci.lock mutex initialization to ixgbe_sw_init() before any ACI
> command is sent. Along with that move also related SWFW semaphore in
> order to reduce size of ixgbe_probe() and that way all locks are
> initialized in ixgbe_sw_init().
> 
> Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Fixes: 4600cdf9f5ac ("ixgbe: Enable link management in E610 device")
> Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>