* [BUG] drivers/spi: a possible sleep-in-atomic bug in atmel_spi_remove
@ 2017-12-12 7:30 Jia-Ju Bai
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From: Jia-Ju Bai @ 2017-12-12 7:30 UTC (permalink / raw)
To: nicolas.ferre-UWL1GkI3JZL3oGB3hsPCZA,
broonie-DgEjT+Ai2ygdnm+yROfE0A,
alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8
Cc: linux-spi-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
Linux Kernel Mailing List
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
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2017-12-12 7:30 [BUG] drivers/spi: a possible sleep-in-atomic bug in atmel_spi_remove Jia-Ju Bai
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