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ALSA: ice1724: Fix sleep-in-atomic in Infrasonic Quartet support code 

Jia-Ju Bai reported a possible sleep-in-atomic scenario in the ice1724
driver with Infrasonic Quartet support code: namely, ice->set_rate
callback gets called inside ice->reg_lock spinlock, while the callback
in quartet.c holds ice->gpio_mutex.

This patch fixes the invalid call: it simply moves the calls of
ice->set_rate and ice->set_mclk callbacks outside the spinlock.

Reported-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/5d43135e-73b9-a46a-2155-9e91d0dcdf83@gmail.com
Link: https://lore.kernel.org/r/20191218192606.12866-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
alistair/sunxi64-5.5-dsi
Takashi Iwai 2019-12-18 20:26:06 +01:00
parent e79c22695a
commit 0aec96f589
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
sound/pci/ice1712/ice1724.c
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@ -647,6 +647,7 @@ static int snd_vt1724_set_pro_rate(struct snd_ice1712 *ice, unsigned int rate,
unsigned long flags;
unsigned char mclk_change;
unsigned int i, old_rate;
bool call_set_rate = false;
if (rate > ice->hw_rates->list[ice->hw_rates->count - 1])
return -EINVAL;
@ -670,7 +671,7 @@ static int snd_vt1724_set_pro_rate(struct snd_ice1712 *ice, unsigned int rate,
* setting clock rate for internal clock mode */
old_rate = ice->get_rate(ice);
if (force || (old_rate != rate))
ice->set_rate(ice, rate);
call_set_rate = true;
else if (rate == ice->cur_rate) {
spin_unlock_irqrestore(&ice->reg_lock, flags);
return 0;
@ -678,12 +679,14 @@ static int snd_vt1724_set_pro_rate(struct snd_ice1712 *ice, unsigned int rate,
}
ice->cur_rate = rate;
spin_unlock_irqrestore(&ice->reg_lock, flags);
if (call_set_rate)
ice->set_rate(ice, rate);
/* setting master clock */
mclk_change = ice->set_mclk(ice, rate);
spin_unlock_irqrestore(&ice->reg_lock, flags);
if (mclk_change && ice->gpio.i2s_mclk_changed)
ice->gpio.i2s_mclk_changed(ice);
if (ice->gpio.set_pro_rate)