linux-kernel - [BUG] sound/soc/samsung: a possible sleep-in-atomic bugs in s3c_pcm_hw

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Date:   Tue, 12 Dec 2017 09:24:34 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     krzk@...nel.org, sbkim73@...sung.com, s.nawrocki@...sung.com,
        lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com
Cc:     alsa-devel@...a-project.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] sound/soc/samsung: a possible sleep-in-atomic bugs in
 s3c_pcm_hw_params

According to sound/soc/samsung/pcm.c, the kernel module may sleep under 
a spinlock.
The function call path is:
s3c_pcm_hw_params (acquire the spinlock)
   clk_get_rate
     clk_core_get_rate
       clk_prepare_lock
         mutex_lock --> may sleep

I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and my code 
review.


Thanks,
Jia-Ju Bai