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dmaengine: dw-axi-dmac: ignore interrupt if no descriptor
[ 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>
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1 changed files with 6 additions and 0 deletions
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@ -1016,6 +1016,11 @@ static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
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/* The completed descriptor currently is in the head of vc list */
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vd = vchan_next_desc(&chan->vc);
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if (!vd) {
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dev_err(chan2dev(chan), "BUG: %s, IRQ with no descriptors\n",
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axi_chan_name(chan));
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goto out;
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}
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if (chan->cyclic) {
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desc = vd_to_axi_desc(vd);
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@ -1045,6 +1050,7 @@ static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
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axi_chan_start_first_queued(chan);
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}
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out:
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spin_unlock_irqrestore(&chan->vc.lock, flags);
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}
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