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rtc: nvmem: disallow registering nvmem more than once

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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>
This commit is contained in:
Alexandre Belloni 2018-02-12 23:47:18 +01:00
commit ab3ea36eda
1 changed files with 3 additions and 0 deletions
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3
drivers/rtc/nvmem.c
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@ -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;