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Subject[PATCH v4] clocksource: acpi_pm: fix return value of __setup handler
Date
__setup() handlers should return 1 to obsolete_checksetup() in
init/main.c to indicate that the boot option has been handled.
A return of 0 causes the boot option/value to be listed as an Unknown
kernel parameter and added to init's (limited) environment strings.

The __setup() handler interface isn't meant to handle negative return
values -- they are non-zero, so they mean "handled" (like a return
value of 1 does), but that's just a quirk. So return 1 from
parse_pmtmr(). Also print a warning message if kstrtouint() returns
an error.

Fixes: 6b148507d3d0 ("pmtmr: allow command line override of ioport")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: linux-acpi@vger.kernel.org
---
v4: correct Igor's email address to be Reported-by: (Rafael)
v3: also cc: linux-acpi (Rafael)
v2: correct the Fixes: tag (Dan Carpenter);
remove Cc: John Stultz <john.stultz@linaro.org> (bouncing)

drivers/clocksource/acpi_pm.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- linux-next-20220315.orig/drivers/clocksource/acpi_pm.c
+++ linux-next-20220315/drivers/clocksource/acpi_pm.c
@@ -229,8 +229,10 @@ static int __init parse_pmtmr(char *arg)
int ret;

ret = kstrtouint(arg, 16, &base);
- if (ret)
- return ret;
+ if (ret) {
+ pr_warn("PMTMR: invalid 'pmtmr=' value: '%s'\n", arg);
+ return 1;
+ }

pr_info("PMTMR IOPort override: 0x%04x -> 0x%04x\n", pmtmr_ioport,
base);
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