path: root/drivers/rtc
diff options
authorJia-Ju Bai <baijiaju1990@gmail.com>2017-12-13 21:55:50 +0800
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2018-01-12 00:20:28 +0100
commitcd8c0bb2bd57c48c451ebea86065257ef2500b00 (patch)
tree4eb179a50caab10d3ababa0a7f3b6358ae74a8f7 /drivers/rtc
parent2da6877f0e2ced7825a31556ada6b2ac2e50877f (diff)
rtc: r7301: Fix a possible sleep-in-atomic bug in rtc7301_read_time
The driver may sleep under a spinlock. The function call path is: rtc7301_read_time (acquire the spinlock) rtc7301_wait_while_busy usleep_range --> may sleep To fix it, usleep_range is replaced with udelay. This bug is found by my static analysis tool(DSAC) and checked by my code review. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc')
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-r7301.c b/drivers/rtc/rtc-r7301.c
index 28d540885f3d..d846e9703ad6 100644
--- a/drivers/rtc/rtc-r7301.c
+++ b/drivers/rtc/rtc-r7301.c
@@ -95,7 +95,7 @@ static int rtc7301_wait_while_busy(struct rtc7301_priv *priv)
if (!(val & RTC7301_CONTROL_BUSY))
return 0;
- usleep_range(200, 300);
+ udelay(300);
return -ETIMEDOUT;

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