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

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Date:   Mon, 5 Jun 2023 17:26:34 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Li Yang <leoyang.li@....com>, Borislav Petkov <bp@...en8.de>
CC:     Len Brown <lenb@...nel.org>, James Morse <james.morse@....com>,
        Jia He <justin.he@....com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [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>
>
> Boris, Tony, any comments?

All of the callers are expecting NULL for a failure, not an empty list. So this looks OK to me.

Reviewed-by: Tony Luck <tony.luck@...el.com>

-Tony