[PATCH v3] EDAC/altera: Fix device node reference leaks in the SDMMC ECC setup

[Rounak Das <rounakdas2025@gmail.com>]

Under altr_portb_setup() and socfpga_init_sdmmc_ecc(),
of_find_compatible_node() was being used to look up the sdmmc-ecc
node. This node wasn't being dropped using of_node_put().

altr_portb_setup() did not drop its reference under its success path
or on any error path.

socfpga_init_sdmmc_ecc() did an early return thereby skipping the
common exit label and thus leaking the reference.

Add the missing of_node_put() calls in altr_portb_setup(), and route
socfpga_init_sdmmc_ecc()'s success path through the common exit label.

Fixes: 911049845d70 ("EDAC, altera: Add Arria10 SD-MMC EDAC support")
Fixes: 788586efd116 ("EDAC/altera: Initialize peripheral FIFOs in probe()")
Cc: stable@vger.kernel.org # 6.18+
Closes: https://sashiko.dev/#/patchset/20260708091135.94114-1-rounakdas2025%40gmail.com
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Rounak Das <rounakdas2025@gmail.com>
---
v3:
 - Rebase on top of Dinh's "Address sashiko reviews part 1" series (Dinh).
 - Limit stable backport to 6.18+.
v2: https://lore.kernel.org/all/20260717131720.19038-1-rounakdas2025@gmail.com/
v1: https://lore.kernel.org/all/20260717102549.13309-1-rounakdas2025@gmail.com/
---
 drivers/edac/altera_edac.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 4c20fb926160..bb95dab847b3 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -1506,6 +1506,7 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
 	dci = edac_device_alloc_ctl_info(sizeof(*altdev), ecc_name, 1,
 					 ecc_name, 1, 0, edac_idx);
 	if (!dci) {
+		of_node_put(np);
 		edac_printk(KERN_ERR, EDAC_DEVICE,
 			    "%s: Unable to allocate PortB EDAC device\n",
 			    ecc_name);
@@ -1518,6 +1519,7 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
 
 	if (!devres_open_group(device->edac->dev, altr_portb_setup, GFP_KERNEL)) {
 		edac_device_free_ctl_info(dci);
+		of_node_put(np);
 		return -ENOMEM;
 	}
 
@@ -1584,6 +1586,8 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
 		rc = -ENOMEM;
 		goto err_release_group_1;
 	}
+	of_node_put(np);
+
 	altr_create_edacdev_dbgfs(dci, prv);
 
 	list_add(&altdev->next, &altdev->edac->a10_ecc_devices);
@@ -1600,6 +1604,7 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
 	 */
 	devres_release_group(device->edac->dev, altr_portb_setup);
 	edac_device_free_ctl_info(dci);
+	of_node_put(np);
 	edac_printk(KERN_ERR, EDAC_DEVICE,
 		    "%s:Error setting up EDAC device: %d\n", ecc_name, rc);
 	return rc;
@@ -1627,7 +1632,7 @@ static int socfpga_init_sdmmc_ecc(struct altr_edac_device_dev *device)
 		goto exit;
 
 	/* Setup portB */
-	return altr_portb_setup(device);
+	rc = altr_portb_setup(device);
 
 exit:
 	of_node_put(child);

base-commit: eef3b67f9c6782127163b631c9043011a68016e2
-- 
2.54.0 (Apple Git-157)