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@gmail.com
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;