linux-kernel - [PATCH] firewire: sbp2: Replace GFP_ATOMIC with GFP_KERNEL in sbp2_scsi

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Date:   Mon, 23 Jul 2018 16:58:01 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     stefanr@...6.in-berlin.de
Cc:     linux1394-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] firewire: sbp2: Replace GFP_ATOMIC with GFP_KERNEL in sbp2_scsi_queuecommand()

sbp2_scsi_queuecommand() is only set to .queuecommand of 
"struct scsi_host_template", and this function pointer is never called
in atomic context.

sbp2_scsi_queuecommand() calls kzalloc() with GFP_ATOMIC,
which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.

This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/firewire/sbp2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 6bac03999fd4..a7cd9d87eb02 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -1463,7 +1463,7 @@ static int sbp2_scsi_queuecommand(struct Scsi_Host *shost,
 	struct sbp2_command_orb *orb;
 	int generation, retval = SCSI_MLQUEUE_HOST_BUSY;
 
-	orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
+	orb = kzalloc(sizeof(*orb), GFP_KERNEL);
 	if (orb == NULL)
 		return SCSI_MLQUEUE_HOST_BUSY;
 
-- 
2.17.0