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backlight: replace recursion with for loop

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This commit is contained in:
Yu Watanabe
2025-05-14 02:06:02 +09:00
parent 25151ca2b8
commit b7d60b2966
1 changed files with 37 additions and 32 deletions
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src/backlight/backlight.c
+37 -32
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@@ -93,53 +93,58 @@ static int has_multiple_graphics_cards(void) {
}
static int find_pci_or_platform_parent(sd_device *device, sd_device **ret) {
sd_device *parent;
const char *s;
int r;
assert(device);
assert(ret);
r = sd_device_get_parent(device, &parent);
if (r < 0)
return r;
if (device_in_subsystem(parent, "drm")) {
r = sd_device_get_sysname(parent, &s);
for (;;) {
r = sd_device_get_parent(device, &device);
if (r < 0)
return r;
s = startswith(s, "card");
if (!s)
return -ENODATA;
if (device_in_subsystem(device, "drm")) {
const char *s;
s += strspn(s, DIGITS);
if (*s == '-' && !STARTSWITH_SET(s, "-LVDS-", "-Embedded DisplayPort-", "-eDP-"))
/* A connector DRM device, let's ignore all but LVDS and eDP! */
return -EOPNOTSUPP;
r = sd_device_get_sysname(device, &s);
if (r < 0)
return r;
} else if (device_in_subsystem(parent, "pci") &&
sd_device_get_sysattr_value(parent, "class", &s)) {
s = startswith(s, "card");
if (!s)
return -ENODATA;
unsigned long class;
s += strspn(s, DIGITS);
if (*s == '-' && !STARTSWITH_SET(s, "-LVDS-", "-Embedded DisplayPort-", "-eDP-"))
/* A connector DRM device, let's ignore all but LVDS and eDP! */
return -EOPNOTSUPP;
r = safe_atolu(s, &class);
if (r < 0)
return log_device_warning_errno(parent, r, "Cannot parse PCI class '%s': %m", s);
/* Graphics card */
if (class == PCI_CLASS_GRAPHICS_CARD) {
*ret = parent;
return 0;
continue;
}
} else if (device_in_subsystem(parent, "platform")) {
*ret = parent;
return 0;
}
if (device_in_subsystem(device, "pci")) {
uint32_t class;
return find_pci_or_platform_parent(parent, ret);
r = device_get_sysattr_u32(device, "class", &class);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
/* Graphics card */
if (class == PCI_CLASS_GRAPHICS_CARD) {
*ret = device;
return 0;
}
continue;
}
if (device_in_subsystem(device, "platform")) {
*ret = device;
return 0;
}
}
}
static int same_device(sd_device *a, sd_device *b) {