From ec042914054a3965417de7acb4f767365cb47ea8 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 19 Apr 2017 19:47:04 +0200 Subject: [PATCH] ACPI / power: Avoid maybe-uninitialized warning commit fe8c470ab87d90e4b5115902dd94eced7e3305c3 upstream. gcc -O2 cannot always prove that the loop in acpi_power_get_inferred_state() is enterered at least once, so it assumes that cur_state might not get initialized: drivers/acpi/power.c: In function 'acpi_power_get_inferred_state': drivers/acpi/power.c:222:9: error: 'cur_state' may be used uninitialized in this function [-Werror=maybe-uninitialized] This sets the variable to zero at the start of the loop, to ensure that there is well-defined behavior even for an empty list. This gets rid of the warning. The warning first showed up when the -Os flag got removed in a bug fix patch in linux-4.11-rc5. I would suggest merging this addon patch on top of that bug fix to avoid introducing a new warning in the stable kernels. Fixes: 61b79e16c68d (ACPI: Fix incompatibility with mcount-based function graph tracing) Signed-off-by: Arnd Bergmann Signed-off-by: Rafael J. Wysocki [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings --- drivers/acpi/power.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index 9ac2a9fa90ff..6793d24c5279 100644 --- a/drivers/acpi/power.c +++ b/drivers/acpi/power.c @@ -152,7 +152,7 @@ static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) return -EINVAL; /* The state of the list is 'on' IFF all resources are 'on'. */ - + cur_state = 0; for (i = 0; i < list->count; i++) { struct acpi_power_resource *resource; acpi_handle handle = list->handles[i]; -- 2.39.2