net: atlantic: fix warning during hot unplug

Firmware deinitialization performs MMIO accesses which are not
necessary if the device has already been removed. In some cases,
these accesses happen via readx_poll_timeout_atomic which ends up
timing out, resulting in a warning at hw_atl2_utils_fw.c:112:

[  104.595913] Call Trace:
[  104.595915]  <TASK>
[  104.595918]  ? show_regs+0x6c/0x80
[  104.595923]  ? __warn+0x8d/0x150
[  104.595925]  ? aq_a2_fw_deinit+0xcf/0xe0 [atlantic]
[  104.595934]  ? report_bug+0x182/0x1b0
[  104.595938]  ? handle_bug+0x6e/0xb0
[  104.595940]  ? exc_invalid_op+0x18/0x80
[  104.595942]  ? asm_exc_invalid_op+0x1b/0x20
[  104.595944]  ? aq_a2_fw_deinit+0xcf/0xe0 [atlantic]
[  104.595952]  ? aq_a2_fw_deinit+0xcf/0xe0 [atlantic]
[  104.595959]  aq_nic_deinit.part.0+0xbd/0xf0 [atlantic]
[  104.595964]  aq_nic_deinit+0x17/0x30 [atlantic]
[  104.595970]  aq_ndev_close+0x2b/0x40 [atlantic]
[  104.595975]  __dev_close_many+0xad/0x160
[  104.595978]  dev_close_many+0x99/0x170
[  104.595979]  unregister_netdevice_many_notify+0x18b/0xb20
[  104.595981]  ? __call_rcu_common+0xcd/0x700
[  104.595984]  unregister_netdevice_queue+0xc6/0x110
[  104.595986]  unregister_netdev+0x1c/0x30
[  104.595988]  aq_pci_remove+0xb1/0xc0 [atlantic]

Fix this by skipping firmware deinitialization altogether if the
PCI device is no longer present.

Tested with an AQC113 attached via Thunderbolt by performing
repeated unplug cycles while traffic was running via iperf.

Fixes: 97bde5c4f909 ("net: ethernet: aquantia: Support for NIC-specific code")
Signed-off-by: Jacob Moroni <mail@jakemoroni.com>
Reviewed-by: Igor Russkikh <irusskikh@marvell.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250203143604.24930-3-mail@jakemoroni.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
index fe0e3e2a8117188e268e62b182d66f3d936c37a8..71e50fc65c14780303396b92f35479daa3efefe4 100644 (file)
--- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
@@ -1441,7 +1441,9 @@ void aq_nic_deinit(struct aq_nic_s *self, bool link_down)
        aq_ptp_ring_free(self);
        aq_ptp_free(self);
 
-       if (likely(self->aq_fw_ops->deinit) && link_down) {
+       /* May be invoked during hot unplug. */
+       if (pci_device_is_present(self->pdev) &&
+           likely(self->aq_fw_ops->deinit) && link_down) {
                mutex_lock(&self->fwreq_mutex);
                self->aq_fw_ops->deinit(self->aq_hw);
                mutex_unlock(&self->fwreq_mutex);