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dmaengine: nbpfaxi: Add missing check after DMA map

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[ Upstream commit c6ee78fc8f3e653bec427cfd06fec7877ee782bd ]

The DMA map functions can fail and should be tested for errors.
If the mapping fails, unmap and return an error.

Fixes: b45b262cef ("dmaengine: add a driver for AMBA AXI NBPF DMAC IP cores")
Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
Link: https://lore.kernel.org/r/20250707075752.28674-2-fourier.thomas@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Fourier 2025-07-07 09:57:16 +02:00 • committed by Greg Kroah-Hartman
commit 91eea098ab
1 changed files with 13 additions and 0 deletions
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13
drivers/dma/nbpfaxi.c
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@ -705,6 +705,9 @@ static int nbpf_desc_page_alloc(struct nbpf_channel *chan)
list_add_tail(&ldesc->node, &lhead);
ldesc->hwdesc_dma_addr = dma_map_single(dchan->device->dev,
hwdesc, sizeof(*hwdesc), DMA_TO_DEVICE);
if (dma_mapping_error(dchan->device->dev,
ldesc->hwdesc_dma_addr))
goto unmap_error;
dev_dbg(dev, "%s(): mapped 0x%p to %pad\n", __func__,
hwdesc, &ldesc->hwdesc_dma_addr);
@ -731,6 +734,16 @@ static int nbpf_desc_page_alloc(struct nbpf_channel *chan)
spin_unlock_irq(&chan->lock);
return ARRAY_SIZE(dpage->desc);
unmap_error:
while (i--) {
ldesc--; hwdesc--;
dma_unmap_single(dchan->device->dev, ldesc->hwdesc_dma_addr,
sizeof(hwdesc), DMA_TO_DEVICE);
}
return -ENOMEM;
}
static void nbpf_desc_put(struct nbpf_desc *desc)