mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 09:14:19 +08:00
3e081628d5
This patch fixes an issue that a race condition happens between a client driver and the rcar-dmac driver: - The rcar_dmac_isr_transfer_end() is called. - The done list appears, and desc.running is the next active list. - rcar_dmac_chan_get_residue() is called by a client driver before rcar_dmac_isr_channel_thread() is called. - The rcar_dmac_chan_get_residue() will not find any descriptors. - And, the following WARNING happens: WARN(1, "No descriptor for cookie!"); The sh-sci driver with HSCIF (921,600bps) on R-Car H3 can cause this situation. So, this patch checks the done lists in rcar_dmac_chan_get_residue() and returns zero if the done lists has the argument cookie. Tested-by: Nguyen Viet Dung <dung.nguyen.aj@renesas.com> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com> |
||
|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| rcar-dmac.c | ||
| shdma-arm.h | ||
| shdma-base.c | ||
| shdma-of.c | ||
| shdma-r8a73a4.c | ||
| shdma.h | ||
| shdmac.c | ||
| sudmac.c | ||
| usb-dmac.c | ||