From 621fdf60ab22dd902d52a670e943371400b4ee20 Mon Sep 17 00:00:00 2001 From: Jia-Ju Bai <baijiaju1990@gmail.com> Date: Mon, 9 Apr 2018 21:03:20 +0800 Subject: [PATCH] ALSA: ad1889: Replace mdelay with usleep_range in snd_ad1889_init snd_ad1889_init() is never called in atomic context. The call chain ending up at snd_ad1889_init() is: [1] snd_ad1889_init() <- snd_ad1889_create() <- snd_ad1889_probe() snd_ad1889_probe() is only set as ".probe" in struct pci_driver. This function is not called in atomic context. Despite never getting called from atomic context, snd_ad1889_init() calls mdelay for busy wait. This is not necessary and can be replaced with usleep_range to avoid busy waiting. This is found by a static analysis tool named DCNS written by myself. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> --- sound/pci/ad1889.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/pci/ad1889.c b/sound/pci/ad1889.c index 0bf2c04eeada..d4965ebe967f 100644 --- a/sound/pci/ad1889.c +++ b/sound/pci/ad1889.c @@ -872,7 +872,7 @@ snd_ad1889_init(struct snd_ad1889 *chip) ad1889_writew(chip, AD_DS_CCS, AD_DS_CCS_CLKEN); /* turn on clock */ ad1889_readw(chip, AD_DS_CCS); /* flush posted write */ - mdelay(10); + usleep_range(10000, 11000); /* enable Master and Target abort interrupts */ ad1889_writel(chip, AD_DMA_DISR, AD_DMA_DISR_PMAE | AD_DMA_DISR_PTAE);