linux-kernel - [PATCH] drivers/scsi/csiostor: do not sleep with a spin lock held

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Date:   Wed, 19 Jan 2022 05:59:55 +0000
From:   cgel.zte@...il.com
To:     jejb@...ux.ibm.com
Cc:     martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>, CGEL ZTE <cgel.zte@...il.com>
Subject: [PATCH] drivers/scsi/csiostor: do not sleep with a spin lock held

From: Minghao Chi <chi.minghao@....com.cn>

The might_sleep_if function in the mempool_alloc
may cause a sleep lock.We can't mempool_alloc()
with a spin lock held, so bring it up front.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi <chi.minghao@....com.cn>
Signed-off-by: CGEL ZTE <cgel.zte@...il.com>
---
 drivers/scsi/csiostor/csio_attr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/csiostor/csio_attr.c b/drivers/scsi/csiostor/csio_attr.c
index 200e50089711..3d4ab439c756 100644
--- a/drivers/scsi/csiostor/csio_attr.c
+++ b/drivers/scsi/csiostor/csio_attr.c
@@ -424,8 +424,8 @@ csio_fcoe_alloc_vnp(struct csio_hw *hw, struct csio_lnode *ln)
 
 	/* Issue VNP cmd to alloc vport */
 	/* Allocate Mbox request */
-	spin_lock_irq(&hw->lock);
 	mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
+	spin_lock_irq(&hw->lock);
 	if (!mbp) {
 		CSIO_INC_STATS(hw, n_err_nomem);
 		ret = -ENOMEM;
@@ -505,8 +505,8 @@ csio_fcoe_free_vnp(struct csio_hw *hw, struct csio_lnode *ln)
 	/* Issue VNP cmd to free vport */
 	/* Allocate Mbox request */
 
-	spin_lock_irq(&hw->lock);
 	mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
+	spin_lock_irq(&hw->lock);
 	if (!mbp) {
 		CSIO_INC_STATS(hw, n_err_nomem);
 		ret = -ENOMEM;
-- 
2.25.1