linux-kernel - [PATCH v4] PCI: rcar-ep: Fix the issue of the name parameter when calling devm_request_mem

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Message-ID: <tencent_F1132FBA08580D482F6A1EF7605710E5F005@qq.com>
Date: Tue,  7 Jan 2025 21:51:23 +0800
From: kingdix10@...com
To: marek.vasut+renesas@...il.com,
	yoshihiro.shimoda.uh@...esas.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	manivannan.sadhasivam@...aro.org,
	robh@...nel.org,
	bhelgaas@...gle.com,
	prabhakar.csengg@...il.com
Cc: linux-pci@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	King Dix <kingdix10@...com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v4] PCI: rcar-ep: Fix the issue of the name parameter when calling devm_request_mem_region

From: King Dix <kingdix10@...com>

When using devm_request_mem_region to request a resource, if the passed
variable is a stack string variable, it will lead to an oops issue when
executing the command cat /proc/iomem.

Fix this by replacing outbound_name with the name of the previously
requested resource.

Fixes: 2a6d0d63d999 ("PCI: rcar: Add endpoint mode support")

Signed-off-by: King Dix <kingdix10@...com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
Changes in v4:
  - Add more information to the comment.
Changes in v3:
  - Fix the spelling issue in the comment.
Changes in v2:
  - Fix the code indentation issue.
---
 drivers/pci/controller/pcie-rcar-ep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-rcar-ep.c b/drivers/pci/controller/pcie-rcar-ep.c
index 047e2cef5afc..c5e0d025bc43 100644
--- a/drivers/pci/controller/pcie-rcar-ep.c
+++ b/drivers/pci/controller/pcie-rcar-ep.c
@@ -107,7 +107,7 @@ static int rcar_pcie_parse_outbound_ranges(struct rcar_pcie_endpoint *ep,
 		}
 		if (!devm_request_mem_region(&pdev->dev, res->start,
 					     resource_size(res),
-					     outbound_name)) {
+					     res->name)) {
 			dev_err(pcie->dev, "Cannot request memory region %s.\n",
 				outbound_name);
 			return -EIO;
-- 
2.43.0