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dmaengine: dw-axi-dmac: ignore interrupt if no descriptor

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[ Upstream commit 820f5ce999 ]

If the channel has no descriptor and the interrupt is raised then the
kernel will OOPS. Check the result of vchan_next_desc() in the handler
axi_chan_block_xfer_complete() to avoid the error happening.

Signed-off-by: Ben Dooks <ben.dooks@sifive.com>
Link: https://lore.kernel.org/r/20220708170153.269991-4-ben.dooks@sifive.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ben Dooks 2022-07-08 18:01:53 +01:00 committed by Greg Kroah-Hartman
parent af76e6fdcf
commit 54aa6c4936
1 changed files with 6 additions and 0 deletions
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6
drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
View file

@ -1016,6 +1016,11 @@ static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
/* The completed descriptor currently is in the head of vc list */
vd = vchan_next_desc(&chan->vc);
if (!vd) {
dev_err(chan2dev(chan), "BUG: %s, IRQ with no descriptors\n",
axi_chan_name(chan));
goto out;
}
if (chan->cyclic) {
desc = vd_to_axi_desc(vd);
@ -1045,6 +1050,7 @@ static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
axi_chan_start_first_queued(chan);
}
out:
spin_unlock_irqrestore(&chan->vc.lock, flags);
}