From: Dmitry Osipenko digetx@gmail.com
[ Upstream commit 8e84172e372bdca20c305d92d51d33640d2da431 ]
It's incorrect to check the channel's "busy" state without taking a lock. That shouldn't cause any real troubles, nevertheless it's always better not to have any race conditions in the code.
Signed-off-by: Dmitry Osipenko digetx@gmail.com Acked-by: Jon Hunter jonathanh@nvidia.com Link: https://lore.kernel.org/r/20200209163356.6439-5-digetx@gmail.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/tegra20-apb-dma.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index 4a750e29bfb53..3fe27dbde5b2b 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -1287,8 +1287,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
- if (tdc->busy) - tegra_dma_terminate_all(dc); + tegra_dma_terminate_all(dc);
spin_lock_irqsave(&tdc->lock, flags); list_splice_init(&tdc->pending_sg_req, &sg_req_list);