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authorJia-Ju Bai <baijiaju1990@gmail.com>2018-04-09 16:03:20 +0300
committerTakashi Iwai <tiwai@suse.de>2018-04-16 14:49:07 +0300
commit621fdf60ab22dd902d52a670e943371400b4ee20 (patch)
tree9ba7bb1bcace8e45d0ac2b44962f64e5774c0263 /sound/pci/ad1889.c
parent0dc72fcc86e62632d0dbe8df39ed3e91e7f3fb4a (diff)
downloadlinux-621fdf60ab22dd902d52a670e943371400b4ee20.tar.xz
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>
Diffstat (limited to 'sound/pci/ad1889.c')
-rw-r--r--sound/pci/ad1889.c2
1 files changed, 1 insertions, 1 deletions
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);