[PATCH v2] dma: ti: k3-udma: Fix error handling for setup_resources() in udma_probe()

[Siddharth Vadapalli]

In udma_probe() the return value of setup_resources() is stored in the
u32 "ch_count" member of "struct udma_dev", due to which any negative
return value which indicates an error is masked.

Fix this by storing the return value of setup_resources() in the already
declared integer variable "ret", followed by assigning it to the "ch_count"
member of "struct udma_dev" in case of no error.

While at it, change the "return ret" at the end of udma_probe() to a
"return 0", to explicitly indicate that probe was successful.

Fixes: a8837cf43839 ("dma: ti: k3-udma: Query DMA channels allocated from Resource Manager")
Signed-off-by: Siddharth Vadapalli <s-vadapalli at ti.com>
---

Hello,

This patch is based on commit
3e6f2a94bf Merge tag 'u-boot-imx-master-20240219' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx
of the master branch of U-Boot.

v1:
https://patchwork.ozlabs.org/project/uboot/patch/20240216104105.494602-1-s-vadapalli@ti.com/
Changes since v1:
- Rebased patch on latest U-Boot tree.
- As pointed out by Dan in reply to the v1 patch, since the return value of
  setup_resources() cannot be zero, update the check performed on the
  return value accordingly.

Regards,
Siddharth.

 drivers/dma/ti/k3-udma.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index eea9ec9659..ed0a9bf487 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -1770,9 +1770,11 @@ static int udma_probe(struct udevice *dev)
 		return PTR_ERR(ud->ringacc);
 
 	ud->dev = dev;
-	ud->ch_count = setup_resources(ud);
-	if (ud->ch_count <= 0)
-		return ud->ch_count;
+	ret = setup_resources(ud);
+	if (ret < 0)
+		return ret;
+
+	ud->ch_count = ret;
 
 	for (i = 0; i < ud->bchan_cnt; i++) {
 		struct udma_bchan *bchan = &ud->bchans[i];
@@ -1831,7 +1833,7 @@ static int udma_probe(struct udevice *dev)
 
 	uc_priv->supported = DMA_SUPPORTS_MEM_TO_MEM | DMA_SUPPORTS_MEM_TO_DEV;
 
-	return ret;
+	return 0;
 }
 
 static int udma_push_to_ring(struct k3_nav_ring *ring, void *elem)
-- 
2.34.1