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authorArnd Bergmann <arnd@arndb.de>2016-09-06 15:50:47 +0300
committerThierry Reding <thierry.reding@gmail.com>2016-09-08 11:58:33 +0300
commit2fbc487df6e6927bc0a0092f86d4d15961e070de (patch)
tree7ba46283b48de8cddfdce4d7d234e2b2da148448 /drivers/pwm
parent7d8a600c916cab347662de212340d3eaf0e93db2 (diff)
downloadlinux-2fbc487df6e6927bc0a0092f86d4d15961e070de.tar.xz
pwm: meson: Handle unknown ID values
When building with -Wmaybe-uninitialized, we get a couple of harmless warnings about three functions in this new driver that don't look safe to the compiler: drivers/pwm/pwm-meson.c: In function 'meson_pwm_get_state': drivers/pwm/pwm-meson.c:355:26: error: 'mask' may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/pwm/pwm-meson.c: In function 'meson_pwm_disable': drivers/pwm/pwm-meson.c:263:13: error: 'enable' may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/pwm/pwm-meson.c: In function 'meson_pwm_apply': drivers/pwm/pwm-meson.c:231:13: error: 'clk_shift' may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/pwm/pwm-meson.c:231:36: error: 'enable' may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/pwm/pwm-meson.c:231:24: error: 'clk_enable' may be used uninitialized in this function [-Werror=maybe-uninitialized] Specifically, if we have a device with an ID other than 0 or 1, this would result in undefined behavior. This is currently not possible, but the compiler cannot be expected to know this. This patch adds a 'default' clause to let the compiler know what to do instead, which shuts up the warning and makes the code slightly more resiliant in case it gets extended to other identifiers. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
-rw-r--r--drivers/pwm/pwm-meson.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index bfbbe7f3cdc1..381871b2bb46 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -245,6 +245,9 @@ static void meson_pwm_enable(struct meson_pwm *meson,
enable = MISC_B_EN;
offset = REG_PWM_B;
break;
+
+ default:
+ return;
}
value = readl(meson->base + REG_MISC_AB);
@@ -273,6 +276,9 @@ static void meson_pwm_disable(struct meson_pwm *meson, unsigned int id)
case 1:
enable = MISC_B_EN;
break;
+
+ default:
+ return;
}
value = readl(meson->base + REG_MISC_AB);
@@ -352,6 +358,9 @@ static void meson_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
case 1:
mask = MISC_B_EN;
break;
+
+ default:
+ return;
}
value = readl(meson->base + REG_MISC_AB);