dmaengine: ti: k3-udma: Fix the running channel handling in alloc_chan_resources

[ Upstream commit b5b0180c2f767e90b4a6a885a0a2abaab6e3d48d ]

In the unlikely case when the channel is running (RT enabled) during
alloc_chan_resources then we should use udma_reset_chan() and not
udma_stop() as the later is trying to initiate a teardown on the channel,
which is not valid at this point.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20200527070612.636-3-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 35f54a1af29d86210de4e408d280252b9078ec9f..b777f1924968f479bee1d7013a329121ee72a283 100644 (file)
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -1868,7 +1868,7 @@ static int udma_alloc_chan_resources(struct dma_chan *chan)
 
        if (udma_is_chan_running(uc)) {
                dev_warn(ud->dev, "chan%d: is running!\n", uc->id);
-               udma_stop(uc);
+               udma_reset_chan(uc, false);
                if (udma_is_chan_running(uc)) {
                        dev_err(ud->dev, "chan%d: won't stop!\n", uc->id);
                        goto err_res_free;