linux-kernel - [PATCH] misc: ti-st: Replace GFP_ATOMIC with GFP_KERNEL in kim

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Date:   Wed, 11 Apr 2018 11:07:32 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     arvind.yadav.cs@...il.com, johannes.berg@...el.com,
        stephen@...workplumber.org, davem@...emloft.net,
        gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] misc: ti-st: Replace GFP_ATOMIC with GFP_KERNEL in kim_probe

kim_probe() is never called in atomic context.
This function is only set as ".probe" in struct platform_driver.

Despite never getting called from atomic context,
kim_probe() calls kzalloc() 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/misc/ti-st/st_kim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/ti-st/st_kim.c b/drivers/misc/ti-st/st_kim.c
index b77aaca..5ec3f5a 100644
--- a/drivers/misc/ti-st/st_kim.c
+++ b/drivers/misc/ti-st/st_kim.c
@@ -735,7 +735,7 @@ static int kim_probe(struct platform_device *pdev)
 		st_kim_devices[0] = pdev;
 	}

-	kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC);
+	kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_KERNEL);
 	if (!kim_gdata) {
 		pr_err("no mem to allocate");
 		return -ENOMEM;
-- 
1.9.1