On 17/01/2025 14:17, Yemike Abhilash Chandra wrote:
> Currently, a local dma_cap_mask_t variable is used to store device
> cap_mask within udma_of_xlate(). However, the DMA_PRIVATE flag in
> the device cap_mask can get cleared when the last channel is released.
> This can happen right after storing the cap_mask locally in
> udma_of_xlate() and subsequent dma_request_channel() can fail due to
> mismatch in the cap_mask. Fix this by removing the local dma_cap_mask_t
> variable and directly using the one from the dma_device structure.
Acked-by: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx>
>
> Signed-off-by: Vaishnav Achath <vaishnav.a@xxxxxx>
> Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@xxxxxx>
> ---
> drivers/dma/ti/k3-udma.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
> index 7ed1956b4642..c775a2284e86 100644
> --- a/drivers/dma/ti/k3-udma.c
> +++ b/drivers/dma/ti/k3-udma.c
> @@ -4246,7 +4246,6 @@ static struct dma_chan *udma_of_xlate(struct of_phandle_args *dma_spec,
> struct of_dma *ofdma)
> {
> struct udma_dev *ud = ofdma->of_dma_data;
> - dma_cap_mask_t mask = ud->ddev.cap_mask;
> struct udma_filter_param filter_param;
> struct dma_chan *chan;
>
> @@ -4278,7 +4277,7 @@ static struct dma_chan *udma_of_xlate(struct of_phandle_args *dma_spec,
> }
> }
>
> - chan = __dma_request_channel(&mask, udma_dma_filter_fn, &filter_param,
> + chan = __dma_request_channel(&ud->ddev.cap_mask, udma_dma_filter_fn, &filter_param,
> ofdma->of_node);
> if (!chan) {
> dev_err(ud->dev, "get channel fail in %s.\n", __func__);
--
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