linux-kernel - [PATCH 2/2] net: wireless: zydas: Replace GFP_ATOMIC with GFP_KERNEL in zd1201_fw

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Message-Id: <1523367023-31981-1-git-send-email-baijiaju1990@gmail.com>
Date:   Tue, 10 Apr 2018 21:30:23 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     kvalo@...eaurora.org, davem@...emloft.net,
        arvind.yadav.cs@...il.com, johannes.berg@...el.com,
        stephen@...workplumber.org
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH 2/2] net: wireless: zydas: Replace GFP_ATOMIC with GFP_KERNEL in zd1201_fw_upload

zd1201_probe() is never called in atomic context.

zd1201_fw_upload() is only called by zd1201_probe(), 
which is only set as ".probe" in struct usb_driver.

Despite never getting called from atomic context,
zd1201_fw_upload() calls kmalloc() with GFP_ATOMIC,
which does not sleep for allocation.
GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL,
which can sleep and improve the possibility of sucessful allocation.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/net/wireless/zydas/zd1201.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/zydas/zd1201.c b/drivers/net/wireless/zydas/zd1201.c
index 581e857..cba2bed 100644
--- a/drivers/net/wireless/zydas/zd1201.c
+++ b/drivers/net/wireless/zydas/zd1201.c
@@ -74,7 +74,7 @@ static int zd1201_fw_upload(struct usb_device *dev, int apfw)
 	data = fw_entry->data;
         len = fw_entry->size;

-	buf = kmalloc(1024, GFP_ATOMIC);
+	buf = kmalloc(1024, GFP_KERNEL);
 	if (!buf) {
 		err = -ENOMEM;
 		goto exit;
-- 
1.9.1