Re: 4.6-rc1 regression in SPI core -- deadlock

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On 04/04/2016 06:50 AM, Rich Felker wrote:
> I've spent several days trying to debug a deadlock using our local
> (not yet ready for upstream) driver for the J-Core SPI device and it
> seems to be a new deadlock in the SPI core caused by commit
> 556351f14e74 and unrelated to the particular driver. Commit
> 49023d2e4ead tried to solve a related deadlock problem, but there
> still seems to be a lock order issue and it's affecting SPI use even
> without the spi_flash_read optimization. The deadlock I'm observing
> has a kworker thread stuck in wait_for_completion called from
> spi_sync_locked (ultimately from mmc_rescan) and the completion is
> never finishing because this kworker thread has the bus locked while
> the spi master task has already started processing the queue but can't
> proceed because the bus lock is taken.
> 
> Anyone else seen this? Ideas for a proper fix?

Could you try 24c8cd1b081286("spi: fix possible deadlock between
internal bus locks and bus_lock_flag") from linux-next?

-- 
Regards
Vignesh
--
To unsubscribe from this list: send the line "unsubscribe linux-spi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Kernel]     [Linux ARM (vger)]     [Linux ARM MSM]     [Linux Omap]     [Linux Arm]     [Linux Tegra]     [Fedora ARM]     [Linux for Samsung SOC]     [eCos]     [Linux Fastboot]     [Gcc Help]     [Git]     [DCCP]     [IETF Announce]     [Security]     [Linux MIPS]     [Yosemite Campsites]

  Powered by Linux