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sd-device: get_subsystem - don't complain if a device does not have a subsystem

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This commit is contained in:
Tom Gundersen 2015-06-01 23:51:37 +02:00
parent d4cb023490
commit 4189708ad0
2 changed files with 8 additions and 2 deletions
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7
src/libsystemd/sd-device/sd-device.c
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@ -785,7 +785,7 @@ _public_ int sd_device_get_subsystem(sd_device *device, const char **ret) {
path_startswith(device->devpath, "/class/") ||
path_startswith(device->devpath, "/bus/"))
r = device_set_subsystem(device, "subsystem");
if (r < 0)
if (r < 0 && r != -ENOENT)
return log_debug_errno(r, "sd-device: could not set subsystem for %s: %m", device->devpath);
device->subsystem_set = true;
@ -1188,6 +1188,8 @@ int device_get_id_filename(sd_device *device, const char **ret) {
return r;
if (major(devnum) > 0) {
assert(subsystem);
/* use dev_t -- b259:131072, c254:0 */
r = asprintf(&id, "%c%u:%u",
streq(subsystem, "block") ? 'b' : 'c',
@ -1209,6 +1211,9 @@ int device_get_id_filename(sd_device *device, const char **ret) {
if (!sysname)
return -EINVAL;
if (!subsystem)
return -EINVAL;
r = asprintf(&id, "+%s:%s", subsystem, sysname);
if (r < 0)
return -ENOMEM;

3
src/libudev/libudev-device.c
View file

@ -178,7 +178,8 @@ _public_ const char *udev_device_get_subsystem(struct udev_device *udev_device)
if (r < 0) {
errno = -r;
return NULL;
}
} else if (!subsystem)
errno = ENODATA;
return subsystem;
}