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rtc: rx8025: protect ctrl1 register update by rtc->ops_lock 

The ctrl1 register is accessed by alarm operations.  But it is updated
in threaded interrupt handler without acquiring rtc->ops_lock.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Akinobu Mita 2016-02-15 23:49:07 +09:00 committed by Alexandre Belloni
parent 0a966c0732
commit 9dbe385296
1 changed files with 4 additions and 0 deletions
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4
drivers/rtc/rtc-rx8025.c
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@ -146,8 +146,10 @@ static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
{ {
struct i2c_client *client = dev_id; struct i2c_client *client = dev_id;
struct rx8025_data *rx8025 = i2c_get_clientdata(client); struct rx8025_data *rx8025 = i2c_get_clientdata(client);
struct mutex *lock = &rx8025->rtc->ops_lock;
int status; int status;
mutex_lock(lock);
status = rx8025_read_reg(client, RX8025_REG_CTRL2); status = rx8025_read_reg(client, RX8025_REG_CTRL2);
if (status < 0) if (status < 0)
goto out; goto out;
@ -172,6 +174,8 @@ static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
} }
out: out:
mutex_unlock(lock);
return IRQ_HANDLED; return IRQ_HANDLED;
} }