[PATCH 15/26] lpfc: Fix call trace observed during I/O with CMF enabled

[James Smart <jsmart2021@gmail.com>]

The following was seen with CMF enabled:

BUG: using smp_processor_id() in preemptible
code: systemd-udevd/31711
kernel: caller is lpfc_update_cmf_cmd+0x214/0x420  [lpfc]
kernel: CPU: 12 PID: 31711 Comm: systemd-udevd
kernel: Call Trace:
kernel: <TASK>
kernel: dump_stack_lvl+0x44/0x57
kernel: check_preemption_disabled+0xbf/0xe0
kernel: lpfc_update_cmf_cmd+0x214/0x420 [lpfc]
kernel: lpfc_nvme_fcp_io_submit+0x23b4/0x4df0 [lpfc]

this_cpu_ptr() calls smp_processor_id() in a preemptible context.

Fix by using per_cpu_ptr() with raw_smp_processor_id() instead.

Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
---
 drivers/scsi/lpfc/lpfc_scsi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index c3daf7a3e123..a949fe53651a 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -3835,7 +3835,7 @@ lpfc_update_cmf_cmpl(struct lpfc_hba *phba,
 		else
 			time = div_u64(time + 500, 1000); /* round it */
 
-		cgs = this_cpu_ptr(phba->cmf_stat);
+		cgs = per_cpu_ptr(phba->cmf_stat, raw_smp_processor_id());
 		atomic64_add(size, &cgs->rcv_bytes);
 		atomic64_add(time, &cgs->rx_latency);
 		atomic_inc(&cgs->rx_io_cnt);
@@ -3879,7 +3879,7 @@ lpfc_update_cmf_cmd(struct lpfc_hba *phba, uint32_t size)
 			atomic_set(&phba->rx_max_read_cnt, size);
 	}
 
-	cgs = this_cpu_ptr(phba->cmf_stat);
+	cgs = per_cpu_ptr(phba->cmf_stat, raw_smp_processor_id());
 	atomic64_add(size, &cgs->total_bytes);
 	return 0;
 }
-- 
2.26.2