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A potential bug was reported in the email "[BUG] atmel_ssc_dai: a possible sleep-in-atomic bug in atmel_ssc_shutdown"[1] Indeed in the function atmel_ssc_shutdown() free_irq() was called in a critical section protected by spinlock. However this spinlock is only used in atmel_ssc_shutdown() and atmel_ssc_startup() functions. After further analysis, it occurred that the call to these function are already protected by mutex used on the calling functions. Then we can remove the spinlock which will fix this bug as a side effect. Thanks to this patch the following message disappears: "BUG: sleeping function called from invalid context at kernel/locking/mutex.c:909" [1]: https://www.spinics.net/lists/alsa-devel/msg71286.html Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com> Link: https://lore.kernel.org/r/20190918100344.23629-1-gregory.clement@bootlin.com Signed-off-by: Mark Brown <broonie@kernel.org> |
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| .. | ||
| atmel_ssc_dai.c | ||
| atmel_ssc_dai.h | ||
| atmel_wm8904.c | ||
| atmel-classd.c | ||
| atmel-classd.h | ||
| atmel-i2s.c | ||
| atmel-pcm-dma.c | ||
| atmel-pcm-pdc.c | ||
| atmel-pcm.h | ||
| atmel-pdmic.c | ||
| atmel-pdmic.h | ||
| Kconfig | ||
| Makefile | ||
| mchp-i2s-mcc.c | ||
| mikroe-proto.c | ||
| sam9g20_wm8731.c | ||
| sam9x5_wm8731.c | ||
| tse850-pcm5142.c | ||