linux-kernel - [PATCH v2] apei/ghes: correctly return NULL for ghes_get

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Date:   Fri, 19 May 2023 15:12:49 -0500
From:   Li Yang <leoyang.li@....com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, James Morse <james.morse@....com>,
        Tony Luck <tony.luck@...el.com>,
        Borislav Petkov <bp@...en8.de>, Jia He <justin.he@....com>
Cc:     Li Yang <leoyang.li@....com>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] apei/ghes: correctly return NULL for ghes_get_devices()

Since 315bada690e0 ("EDAC: Check for GHES preference in the
chipset-specific EDAC drivers"), vendor specific EDAC driver will not
probe correctly when CONFIG_ACPI_APEI_GHES is enabled but no GHES device
is present.  Make ghes_get_devices() return NULL when the GHES device
list is empty to fix the problem.

Fixes: 9057a3f7ac36 ("EDAC/ghes: Prepare to make ghes_edac a proper module")
Signed-off-by: Li Yang <leoyang.li@....com>
Cc: Jia He <justin.he@....com>
---

V2: fix the fallthrough case in x86 path

 drivers/acpi/apei/ghes.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 34ad071a64e9..4382fe13ee3e 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -1544,6 +1544,8 @@ struct list_head *ghes_get_devices(void)
 
 			pr_warn_once("Force-loading ghes_edac on an unsupported platform. You're on your own!\n");
 		}
+	} else if (list_empty(&ghes_devs)) {
+		return NULL;
 	}
 
 	return &ghes_devs;
-- 
2.38.0