From: William Breathitt Gray Date: Tue, 3 Aug 2021 12:06:11 +0000 (+0900) Subject: counter: 104-quad-8: Return error when invalid mode during ceiling_write X-Git-Tag: v5.13.17~132 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=884b922d055e52f0e77043c4bb916c7d4bc8781d;p=thirdparty%2Fkernel%2Fstable.git counter: 104-quad-8: Return error when invalid mode during ceiling_write [ Upstream commit 728246e8f7269ecd35a2c6e6795323e6d8f48db7 ] The 104-QUAD-8 only has two count modes where a ceiling value makes sense: Range Limit and Modulo-N. Outside of these two modes, setting a ceiling value is an invalid operation -- so let's report it as such by returning -EINVAL. Fixes: fc069262261c ("counter: 104-quad-8: Add lock guards - generic interface") Acked-by: Syed Nayyar Waris Signed-off-by: William Breathitt Gray Link: https://lore.kernel.org/r/a2147f022829b66839a1db5530a7fada47856847.1627990337.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c index 9691f8612be87..8de776f3b142a 100644 --- a/drivers/counter/104-quad-8.c +++ b/drivers/counter/104-quad-8.c @@ -715,12 +715,13 @@ static ssize_t quad8_count_ceiling_write(struct counter_device *counter, case 1: case 3: quad8_preset_register_set(priv, count->id, ceiling); - break; + mutex_unlock(&priv->lock); + return len; } mutex_unlock(&priv->lock); - return len; + return -EINVAL; } static ssize_t quad8_count_preset_enable_read(struct counter_device *counter,