linux-kernel - [PATCH] PM/hibernate: fix __setup handler error handling

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Date:   Mon, 28 Feb 2022 14:05:32 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Igor Zhbanov <i.zhbanov@...russia.ru>,
        Fabian Frederick <fabf@...net.be>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>, linux-pm@...r.kernel.org,
        Len Brown <len.brown@...el.com>
Subject: [PATCH] PM/hibernate: fix __setup handler error handling

If an invalid value is used in "resumedelay=<seconds>", it is
silently ignored. Add a warning message and then let the __setup
handler return 1 to indicate that the kernel command line option
has been handled.

Fixes: 317cf7e5e85e3 ("PM / hibernate: convert simple_strtoul to kstrtoul")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: Igor Zhbanov <i.zhbanov@...russia.ru>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@...russia.ru
Cc: Fabian Frederick <fabf@...net.be>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Pavel Machek <pavel@....cz>
Cc: linux-pm@...r.kernel.org
Cc: Len Brown <len.brown@...el.com>
---
 kernel/power/hibernate.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20220228.orig/kernel/power/hibernate.c
+++ linux-next-20220228/kernel/power/hibernate.c
@@ -1329,7 +1329,7 @@ static int __init resumedelay_setup(char
 	int rc = kstrtouint(str, 0, &resume_delay);
 
 	if (rc)
-		return rc;
+		pr_warn("resumedelay: bad option string '%s'\n", str);
 	return 1;
 }