On Mon, Sep 30, 2024 at 6:25 AM Martin Wilck <martin.wilck@xxxxxxxx> wrote:
>
> After commit 379a58caa199 ("scsi: fnic: Move fnic_fnic_flush_tx() to a work
> queue"), it can happen that a work item is sent to an uninitialized work
> queue. This may has the effect that the item being queued is never
> actually queued, and any further actions depending on it will not proceed.
>
> The following warning is observed while the fnic driver is loaded:
>
> kernel: WARNING: CPU: 11 PID: 0 at ../kernel/workqueue.c:1524 __queue_work+0x373/0x410
> kernel: <IRQ>
> kernel: queue_work_on+0x3a/0x50
> kernel: fnic_wq_copy_cmpl_handler+0x54a/0x730 [fnic 62fbff0c42e7fb825c60a55cde2fb91facb2ed24]
> kernel: fnic_isr_msix_wq_copy+0x2d/0x60 [fnic 62fbff0c42e7fb825c60a55cde2fb91facb2ed24]
> kernel: __handle_irq_event_percpu+0x36/0x1a0
> kernel: handle_irq_event_percpu+0x30/0x70
> kernel: handle_irq_event+0x34/0x60
> kernel: handle_edge_irq+0x7e/0x1a0
> kernel: __common_interrupt+0x3b/0xb0
> kernel: common_interrupt+0x58/0xa0
> kernel: </IRQ>
>
> It has been observed that this may break the rediscovery of fibre channel
> devices after a temporary fabric failure.
>
> This patch fixes it by moving the work queue initialization out of
> an if block in fnic_probe().
>
> Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
>
> Fixes: 379a58caa199 ("scsi: fnic: Move fnic_fnic_flush_tx() to a work queue")
> Cc: stable@xxxxxxxxxxxxxxx
> ---
> drivers/scsi/fnic/fnic_main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/fnic/fnic_main.c b/drivers/scsi/fnic/fnic_main.c
> index 0044717d4486..adec0df24bc4 100644
> --- a/drivers/scsi/fnic/fnic_main.c
> +++ b/drivers/scsi/fnic/fnic_main.c
> @@ -830,7 +830,6 @@ static int fnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> spin_lock_init(&fnic->vlans_lock);
> INIT_WORK(&fnic->fip_frame_work, fnic_handle_fip_frame);
> INIT_WORK(&fnic->event_work, fnic_handle_event);
> - INIT_WORK(&fnic->flush_work, fnic_flush_tx);
> skb_queue_head_init(&fnic->fip_frame_queue);
> INIT_LIST_HEAD(&fnic->evlist);
> INIT_LIST_HEAD(&fnic->vlans);
> @@ -948,6 +947,7 @@ static int fnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>
> INIT_WORK(&fnic->link_work, fnic_handle_link);
> INIT_WORK(&fnic->frame_work, fnic_handle_frame);
> + INIT_WORK(&fnic->flush_work, fnic_flush_tx);
> skb_queue_head_init(&fnic->frame_queue);
> skb_queue_head_init(&fnic->tx_queue);
>
> --
> 2.46.1
>
Reviewed-by: Lee Duncan <lduncan@xxxxxxxx>
