forked from Minki/linux
26fd830a99
This patch fixes a race condition about a list of shdma-base driver. If we don't apply this patch, a dma slave driver (especially a usb peripheral driver) may not be able to start the transfer. If a dma slave driver has a callback, __ld_cleanup() will call the callback before this driver removes the list. After the callback, since the return value of __ld_cleanup() is not zero, shdma_chan_ld_cleanup() calls __ld_cleanup() again. And, __ld_clean() will removes the list. At this time, if a dma slave driver calls dmaengine_submit() before this driver removes the list, this driver will set schan->pm_state to SHDMA_PM_PENDING in shdma_tx_submit(). And then, even if a dma slave driver calls dma_async_issue_pending(), this driver don't start the transfer because the schan->pm_state is SHDMA_PM_PENDING in shdma_issue_pending(). So, this patch adds a new condition in __ld_clean() to check if the schan->pm_state is SHDMA_PM_PENDING or not. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com> |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| rcar-audmapp.c | ||
| rcar-hpbdma.c | ||
| shdma-arm.h | ||
| shdma-base.c | ||
| shdma-of.c | ||
| shdma-r8a73a4.c | ||
| shdma.h | ||
| shdmac.c | ||
| sudmac.c | ||