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authorAlexandre Belloni <alexandre.belloni@bootlin.com>2018-02-13 01:47:18 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2018-02-14 22:58:16 +0300
commitab3ea36eda76069ba52e9b6aef5a9370b0b462bf (patch)
treea8d02f3759f5462a49bafe06400fa803781b3dd7 /drivers/rtc/nvmem.c
parent2cc8212198820487ec3fdcc7b98133701fc9dfc3 (diff)
downloadlinux-ab3ea36eda76069ba52e9b6aef5a9370b0b462bf.tar.xz
rtc: nvmem: disallow registering nvmem more than once
Make rtc_nvmem_register return -EBUSY when an nvmem is already registered for that RTC. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/nvmem.c')
-rw-r--r--drivers/rtc/nvmem.c3
1 files changed, 3 insertions, 0 deletions
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;