[PATCH 04/45] rtc: nvmem: disallow registering nvmem more than once
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
Date: 2018-02-12 22:59:03
Also in:
lkml
Subsystem:
real time clock (rtc) subsystem, the rest · Maintainers:
Alexandre Belloni, Linus Torvalds
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