dmaengine: ti: k3-udma: Use cap_mask directly from dma_device structure instead of a local copy

JIRA: https://issues.redhat.com/browse/RHEL-114133
Upstream-Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit 8ca9590
Author: Yemike Abhilash Chandra <[email protected]>
Date: Thu Apr 17 13:25:21 2025 +0530

    dmaengine: ti: k3-udma: Use cap_mask directly from dma_device structure instead of a local copy

    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.

    Fixes: 25dcb5d ("dmaengine: ti: New driver for K3 UDMA")
    Cc: [email protected]
    Signed-off-by: Vaishnav Achath <[email protected]>
    Acked-by: Peter Ujfalusi <[email protected]>
    Reviewed-by: Udit Kumar <[email protected]>
    Signed-off-by: Yemike Abhilash Chandra <[email protected]>
    Link: https://lore.kernel.org/r/[email protected]
    Signed-off-by: Vinod Koul <[email protected]>

(cherry picked from commit 8ca9590)
Signed-off-by: Jerry Snitselaar <[email protected]>

Author: snits

drivers/dma/ti/k3-udma.c

@@ -4247,7 +4247,6 @@ 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;
 
@@ -4279,7 +4278,7 @@ 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__);