linux-kernel - [BUG] atmel_ssc_dai: a possible sleep-in-atomic bug in atmel_ssc

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Message-ID: <59796efc-8acd-6655-cf59-67c162201bd7@gmail.com>
Date:   Tue, 12 Dec 2017 17:52:04 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     nicolas.ferre@...rochip.com, lgirdwood@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        alexandre.belloni@...e-electrons.com, sedji.gaouaou@...el.com
Cc:     alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [BUG] atmel_ssc_dai: a possible sleep-in-atomic bug in
 atmel_ssc_shutdown

According to sound/soc/atmel/atmel_ssc_dai.c, the driver may sleep under 
a spinlock.
The function call path is:
atmel_ssc_shutdown (acquire the spinlock)
   free_irq --> 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 checked 
by my code review.

Thanks,
Jia-Ju Bai