From b06750501f5c0eef7fef094f13d2f2e313c60b79 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 11 Feb 2016 13:23:25 -0700 Subject: dm: core: Add uclass_first_device_err() to return a valid device A common pattern is to call uclass_first_device() and then check if it actually returns a device. Add a new function which does this, returning an error if there are no devices in that uclass. Signed-off-by: Simon Glass --- drivers/core/uclass.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'drivers/core/uclass.c') diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c index 12095e7..1141ce1 100644 --- a/drivers/core/uclass.c +++ b/drivers/core/uclass.c @@ -401,6 +401,19 @@ int uclass_first_device(enum uclass_id id, struct udevice **devp) return uclass_get_device_tail(dev, ret, devp); } +int uclass_first_device_err(enum uclass_id id, struct udevice **devp) +{ + int ret; + + ret = uclass_first_device(id, devp); + if (ret) + return ret; + else if (!*devp) + return -ENODEV; + + return 0; +} + int uclass_next_device(struct udevice **devp) { struct udevice *dev = *devp; -- cgit v1.1