From cbed254f9673256836554b0b6e16941747f925f8 Mon Sep 17 00:00:00 2001 From: Topi Miettinen Date: Thu, 31 Jan 2019 19:07:06 +0200 Subject: [PATCH] backlight: handle loading truncated file I had accidentally filled my /var partition. This caused backlight to fail to start even with disk space, because the brightness files were truncated to zero size: systemd-backlight[624]: acpi_video0: Failed to parse brightness "": Invalid argument systemd-backlight[624]: acpi_video0: Failed to write system 'brightness' attribute: No such device or address systemd[1]: systemd-backlight@backlight:acpi_video0.service: Main process exited, code=exited, status=1/FAILURE systemd[1]: systemd-backlight@backlight:acpi_video0.service: Failed with result 'exit-code'. systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0. Handle a truncated file like non-existent file. --- src/backlight/backlight.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/backlight/backlight.c b/src/backlight/backlight.c index 780ad56eb1d..2fcc693c48f 100644 --- a/src/backlight/backlight.c +++ b/src/backlight/backlight.c @@ -379,7 +379,7 @@ static int run(int argc, char *argv[]) { clamp = shall_clamp(device); r = read_one_line_file(saved, &value); - if (r == -ENOENT) { + if (IN_SET(r, -ENOENT, 0)) { const char *curval; /* Fallback to clamping current brightness or exit early if -- 2.47.3