linux-kernel - [PATCH] sound: soc: intel: bxt_rt298: Replace GFP_ATOMIC with GFP_KERNEL in broxton_audio

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Date:   Mon,  9 Apr 2018 18:47:07 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, pradeep.d.tewani@...el.com,
        subhransu.s.prusty@...el.com, dharageswari.r@...el.com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] sound: soc: intel: bxt_rt298: Replace GFP_ATOMIC with GFP_KERNEL in broxton_audio_probe

broxton_audio_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,
broxton_audio_probe() calls devm_kzalloc() with GFP_ATOMIC,
which waits busily for allocation.
GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL,
to avoid busy waiting and improve the possibility of sucessful allocation.

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 sound/soc/intel/boards/bxt_rt298.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/intel/boards/bxt_rt298.c b/sound/soc/intel/boards/bxt_rt298.c
index 7843104..8257830 100644
--- a/sound/soc/intel/boards/bxt_rt298.c
+++ b/sound/soc/intel/boards/bxt_rt298.c
@@ -578,7 +578,7 @@ static int broxton_audio_probe(struct platform_device *pdev)
 		}
 	}

-	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_ATOMIC);
+	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;

-- 
1.9.1