linux-kernel - [PATCH] scsi: qedf: make qedf_execute

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Message-Id: <20240403150155.412954-1-jmeneghi@redhat.com>
Date: Wed,  3 Apr 2024 11:01:55 -0400
From: John Meneghini <jmeneghi@...hat.com>
To: skashyap@...vell.com
Cc: linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	GR-QLogic-Storage-Upstream@...vell.com,
	martin.petersen@...cle.com,
	guazhang@...hat.com,
	njavali@...vell.com
Subject: [PATCH] scsi: qedf: make qedf_execute_tmf non-preemptible

Stop calling smp_processor_id from preemptible code in qedf_execute_tmf.
This results in BUGON when running an RT kernel.

[ 659.343280] BUG: using smp_processor_id() in preemptible [00000000] code: sg_reset/3646
[ 659.343282] caller is qedf_execute_tmf+0x8b/0x360 [qedf]

Tested-by: Guangwu Zhang <guazhang@...hat.com>
Cc: Saurav Kashyap <skashyap@...vell.com>
Cc: Nilesh Javali <njavali@...vell.com>
Signed-off-by: John Meneghini <jmeneghi@...hat.com>
---
 drivers/scsi/qedf/qedf_io.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/qedf/qedf_io.c b/drivers/scsi/qedf/qedf_io.c
index bf921caaf6ae..054a51713d55 100644
--- a/drivers/scsi/qedf/qedf_io.c
+++ b/drivers/scsi/qedf/qedf_io.c
@@ -2324,9 +2324,6 @@ static int qedf_execute_tmf(struct qedf_rport *fcport, u64 tm_lun,
 	io_req->fcport = fcport;
 	io_req->cmd_type = QEDF_TASK_MGMT_CMD;
 
-	/* Record which cpu this request is associated with */
-	io_req->cpu = smp_processor_id();
-
 	/* Set TM flags */
 	io_req->io_req_flags = QEDF_READ;
 	io_req->data_xfer_len = 0;
@@ -2349,6 +2346,9 @@ static int qedf_execute_tmf(struct qedf_rport *fcport, u64 tm_lun,
 
 	spin_lock_irqsave(&fcport->rport_lock, flags);
 
+	/* Record which cpu this request is associated with */
+	io_req->cpu = smp_processor_id();
+
 	sqe_idx = qedf_get_sqe_idx(fcport);
 	sqe = &fcport->sq[sqe_idx];
 	memset(sqe, 0, sizeof(struct fcoe_wqe));
-- 
2.39.3