Baochen Qiang <[email protected]> wrote:
> In ath12k_dp_tx(), if we reach fail_dma_unmap due to some errors,
> current code does DMA unmap unconditionally on skb_cb->paddr_ext_desc.
> However, skb_cb->paddr_ext_desc may be NULL and thus we get below
> warning:
>
> kernel: [ 8887.076212] WARNING: CPU: 3 PID: 0 at drivers/iommu/dma-iommu.c:1077 iommu_dma_unmap_page+0x79/0x90
>
> Fix it by checking skb_cb->paddr_ext_desc before unmap it.
>
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4
>
> Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
> Signed-off-by: Baochen Qiang <[email protected]>
> Acked-by: Jeff Johnson <[email protected]>
> Signed-off-by: Kalle Valo <[email protected]>
Patch applied to ath-next branch of ath.git, thanks.
9ae8c496d211 wifi: ath12k: fix DMA unmap warning on NULL DMA address
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