dma: cppi41: start tear down only if channel is busy
Start the channel tear down only if the channel is busy, else just
bail out. In some cases its seen that by the time the tear down is
initiated the cppi completes the DMA, especially in ISOCH transfers.
Signed-off-by: George Cherian <george.cherian@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
index c18aebf..d028f36 100644
--- a/drivers/dma/cppi41.c
+++ b/drivers/dma/cppi41.c
@@ -620,12 +620,15 @@
u32 desc_phys;
int ret;
+ desc_phys = lower_32_bits(c->desc_phys);
+ desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
+ if (!cdd->chan_busy[desc_num])
+ return 0;
+
ret = cppi41_tear_down_chan(c);
if (ret)
return ret;
- desc_phys = lower_32_bits(c->desc_phys);
- desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
WARN_ON(!cdd->chan_busy[desc_num]);
cdd->chan_busy[desc_num] = NULL;