From 379a58caa19930e010b7efa1c1f3b9411d3d2ca3 Mon Sep 17 00:00:00 2001
From: Lee Duncan <lduncan@suse.com>
Date: Fri, 9 Feb 2024 10:07:35 -0800
Subject: [PATCH] scsi: fnic: Move fnic_fnic_flush_tx() to a work queue
Rather than call 'fnic_flush_tx()' from interrupt context we should be
moving it onto a work queue to avoid any locking issues.
Fixes: 1a1975551943 ("scsi: fcoe: Fix potential deadlock on &fip->ctlr_lock")
Co-developed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Lee Duncan <lduncan@suse.com>
Link: https://lore.kernel.org/r/ce5ffa5d0ff82c2b2e283b3b4bff23291d49b05c.1707500786.git.lduncan@suse.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
drivers/scsi/fnic/fnic.h | 3 ++-
drivers/scsi/fnic/fnic_fcs.c | 5 +++--
drivers/scsi/fnic/fnic_main.c | 1 +
drivers/scsi/fnic/fnic_scsi.c | 4 ++--
4 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/scsi/fnic/fnic.h b/drivers/scsi/fnic/fnic.h
index 2074937c05bc8..ce73f08ee889f 100644
--- a/drivers/scsi/fnic/fnic.h
+++ b/drivers/scsi/fnic/fnic.h
@@ -305,6 +305,7 @@ struct fnic {
unsigned int copy_wq_base;
struct work_struct link_work;
struct work_struct frame_work;
+ struct work_struct flush_work;
struct sk_buff_head frame_queue;
struct sk_buff_head tx_queue;
@@ -363,7 +364,7 @@ void fnic_handle_event(struct work_struct *work);
int fnic_rq_cmpl_handler(struct fnic *fnic, int);
int fnic_alloc_rq_frame(struct vnic_rq *rq);
void fnic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf);
-void fnic_flush_tx(struct fnic *);
+void fnic_flush_tx(struct work_struct *work);
void fnic_eth_send(struct fcoe_ctlr *, struct sk_buff *skb);
void fnic_set_port_id(struct fc_lport *, u32, struct fc_frame *);
void fnic_update_mac(struct fc_lport *, u8 *new);
diff --git a/drivers/scsi/fnic/fnic_fcs.c b/drivers/scsi/fnic/fnic_fcs.c
index 5e312a55cc7da..a08293b2ad9f5 100644
--- a/drivers/scsi/fnic/fnic_fcs.c
+++ b/drivers/scsi/fnic/fnic_fcs.c
@@ -1182,7 +1182,7 @@ int fnic_send(struct fc_lport *lp, struct fc_frame *fp)
/**
* fnic_flush_tx() - send queued frames.
- * @fnic: fnic device
+ * @work: pointer to work element
*
* Send frames that were waiting to go out in FC or Ethernet mode.
* Whenever changing modes we purge queued frames, so these frames should
@@ -1190,8 +1190,9 @@ int fnic_send(struct fc_lport *lp, struct fc_frame *fp)
*
* Called without fnic_lock held.
*/
-void fnic_flush_tx(struct fnic *fnic)
+void fnic_flush_tx(struct work_struct *work)
{
+ struct fnic *fnic = container_of(work, struct fnic, flush_work);
struct sk_buff *skb;
struct fc_frame *fp;
diff --git a/drivers/scsi/fnic/fnic_main.c b/drivers/scsi/fnic/fnic_main.c
index 5ed1d897311a8..29eead383eb9a 100644
--- a/drivers/scsi/fnic/fnic_main.c
+++ b/drivers/scsi/fnic/fnic_main.c
@@ -830,6 +830,7 @@ 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);
diff --git a/drivers/scsi/fnic/fnic_scsi.c b/drivers/scsi/fnic/fnic_scsi.c
index 8d7fc5284293b..fc4cee91b175c 100644
--- a/drivers/scsi/fnic/fnic_scsi.c
+++ b/drivers/scsi/fnic/fnic_scsi.c
@@ -680,7 +680,7 @@ static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
- fnic_flush_tx(fnic);
+ queue_work(fnic_event_queue, &fnic->flush_work);
reset_cmpl_handler_end:
fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
@@ -736,7 +736,7 @@ static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
}
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
- fnic_flush_tx(fnic);
+ queue_work(fnic_event_queue, &fnic->flush_work);
queue_work(fnic_event_queue, &fnic->frame_work);
} else {
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
--
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