Make rtc_nvmem_register return -EBUSY when an nvmem is already registered for that RTC.
Signed-off-by: Alexandre Belloni <[email protected]> --- drivers/rtc/nvmem.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/rtc/nvmem.c b/drivers/rtc/nvmem.c index 293df6db7c42..fd1c39a5ade5 100644 --- a/drivers/rtc/nvmem.c +++ b/drivers/rtc/nvmem.c @@ -87,6 +87,9 @@ static void rtc_nvram_unregister(struct rtc_device *rtc) int rtc_nvmem_register(struct rtc_device *rtc, struct nvmem_config *nvmem_config) { + if (!IS_ERR_OR_NULL(rtc->nvmem)) + return -EBUSY; + if (!nvmem_config) return -ENODEV; -- 2.16.1
