Re: [alsa-devel] [PATCH] sound: soc: intel: bxt_da7219_max98357a: Replace GFP_ATOMIC with GFP_KERNEL in broxton_audio_probe
From: Pierre-Louis Bossart
Date: Mon Apr 09 2018 - 14:57:53 EST
On 4/9/18 5:46 AM, Jia-Ju Bai wrote:
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.
[answering for the series]
Humm, this is interesting.
If indeed we can afford to sleep then the change should be done on ALL
14 boards in sound/soc/intel/boards which follow the same code pattern.
If we cannot sleep then then none of these changes should be applied.
Liam and Vinod?
This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
---
sound/soc/intel/boards/bxt_da7219_max98357a.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/intel/boards/bxt_da7219_max98357a.c b/sound/soc/intel/boards/bxt_da7219_max98357a.c
index ce35ec7..f4361b7 100644
--- a/sound/soc/intel/boards/bxt_da7219_max98357a.c
+++ b/sound/soc/intel/boards/bxt_da7219_max98357a.c
@@ -585,7 +585,7 @@ static int broxton_audio_probe(struct platform_device *pdev)
{
struct bxt_card_private *ctx;
- ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_ATOMIC);
+ ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;