linux-kernel - [BUG] drivers/spi: a possible sleep-in-atomic bug in atmel_spi

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Message-ID: <229fd3a0-b88e-5b86-e26e-ec6b79d37a2c@gmail.com>
Date:   Tue, 12 Dec 2017 15:30:01 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     nicolas.ferre@...rochip.com, broonie@...nel.org,
        alexandre.belloni@...e-electrons.com
Cc:     linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] drivers/spi: a possible sleep-in-atomic bug in atmel_spi_remove

According to drivers/spi/spi-atmel.c, the kernel module may sleep under 
a spinlock.
The function call path is:
atmel_spi_remove (acquire the spinlock)
   atmel_spi_release_dma
     dma_release_channel
       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 checked 
by my code review.


Thanks,
Jia-Ju Bai