[PATCH 5.18 099/112] dmaengine: imx-sdma: only restart cyclic channel when enabled

[Greg Kroah-Hartman]

From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>

commit 09f7b80fac3e588b282ad26aabd7336d7d293efd upstream.

An interrupt for a channel might be pending even after struct
dma_device::device_terminate_all has been called. In that case the
recently introduced warning message "restart cyclic channel..." triggers
and the channel will be restarted. This is not desired as the channel
has just been stopped. Only restart the channel when we still have a
descriptor set for it (which will be set to NULL in
sdma_terminate_all()).

Fixes: 5b215c28b9235 ("dmaengine: imx-sdma: restart cyclic channel if needed")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220617115042.4004062-1-s.hauer@xxxxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/dma/imx-sdma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -872,7 +872,7 @@ static void sdma_update_channel_loop(str
 	 * SDMA stops cyclic channel when DMA request triggers a channel and no SDMA
 	 * owned buffer is available (i.e. BD_DONE was set too late).
 	 */
-	if (!is_sdma_channel_enabled(sdmac->sdma, sdmac->channel)) {
+	if (sdmac->desc && !is_sdma_channel_enabled(sdmac->sdma, sdmac->channel)) {
 		dev_warn(sdmac->sdma->dev, "restart cyclic channel %d\n", sdmac->channel);
 		sdma_enable_channel(sdmac->sdma, sdmac->channel);
 	}