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| author | Dmitry Osipenko <digetx@gmail.com> | 2020-02-09 19:33:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-01 14:14:35 +0300 |
| commit | 7fbd24e0ea5c327d83825eabc6869581f8e5315e (patch) | |
| tree | 16ae528f8b5a35156dd180d03deb809c730ee4d3 /drivers/dma | |
| parent | 1da6faf4bebe10c7d01c94e2ccdf6a1f976fd02c (diff) | |
| download | linux-7fbd24e0ea5c327d83825eabc6869581f8e5315e.tar.xz | |
dmaengine: tegra-apb: Prevent race conditions on channel's freeing
[ 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>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/tegra20-apb-dma.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index 15481aeaeecd..5ccd24a46e38 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -1225,8 +1225,7 @@ 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); |