| From | Alexandre Belloni <> | Subject | [PATCH 04/45] rtc: nvmem: disallow registering nvmem more than once | Date | Mon, 12 Feb 2018 23:47:18 +0100 |
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Make rtc_nvmem_register return -EBUSY when an nvmem is already registered for that RTC.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> --- 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
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