linux-kernel - [RESEND v13 07/25] CXL/AER: Replace device_lock() in cxl_rch_handle_error

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Message-ID: <20251104170305.4163840-8-terry.bowman@amd.com>
Date: Tue, 4 Nov 2025 11:02:47 -0600
From: Terry Bowman <terry.bowman@....com>
To: <dave@...olabs.net>, <jonathan.cameron@...wei.com>,
	<dave.jiang@...el.com>, <alison.schofield@...el.com>,
	<dan.j.williams@...el.com>, <bhelgaas@...gle.com>, <shiju.jose@...wei.com>,
	<ming.li@...omail.com>, <Smita.KoralahalliChannabasappa@....com>,
	<rrichter@....com>, <dan.carpenter@...aro.org>,
	<PradeepVineshReddy.Kodamati@....com>, <lukas@...ner.de>,
	<Benjamin.Cheatham@....com>, <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	<linux-cxl@...r.kernel.org>, <alucerop@....com>, <ira.weiny@...el.com>
CC: <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<terry.bowman@....com>
Subject: [RESEND v13 07/25] CXL/AER: Replace device_lock() in cxl_rch_handle_error_iter() with guard() lock

cxl_rch_handle_error_iter() includes a call to device_lock() using a goto
for multiple return paths. Improve readability and maintainability by
using the guard() lock variant.

Signed-off-by: Terry Bowman <terry.bowman@....com>

---

Changes in v12->v13:
- New patch
---
 drivers/pci/pcie/aer.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 0b5ed4722ac3..cbaed65577d9 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1187,12 +1187,11 @@ static int cxl_rch_handle_error_iter(struct pci_dev *dev, void *data)
 	if (!is_cxl_mem_dev(dev) || !cxl_error_is_native(dev))
 		return 0;
 
-	/* Protect dev->driver */
-	device_lock(&dev->dev);
+	guard(device)(&dev->dev);
 
 	err_handler = dev->driver ? dev->driver->err_handler : NULL;
 	if (!err_handler)
-		goto out;
+		return 0;
 
 	if (info->severity == AER_CORRECTABLE) {
 		if (err_handler->cor_error_detected)
@@ -1203,8 +1202,6 @@ static int cxl_rch_handle_error_iter(struct pci_dev *dev, void *data)
 		else if (info->severity == AER_FATAL)
 			err_handler->error_detected(dev, pci_channel_io_frozen);
 	}
-out:
-	device_unlock(&dev->dev);
 	return 0;
 }
 
-- 
2.34.1