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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2016-02-15 23:49:07 +0900 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2016-03-14 17:08:19 +0100 |
| commit | 9dbe3852964166fdf3ac4aff4cb67311dfa243bc (patch) | |
| tree | 906b99d286c437cc7621751a86fbb1fd09c398c0 /drivers/rtc/rtc-rx8025.c | |
| parent | 0a966c07323a0506522587e8de96f542ebac04ba (diff) | |
| download | lwn-9dbe3852964166fdf3ac4aff4cb67311dfa243bc.tar.gz lwn-9dbe3852964166fdf3ac4aff4cb67311dfa243bc.zip | |
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>
Diffstat (limited to 'drivers/rtc/rtc-rx8025.c')
| -rw-r--r-- | drivers/rtc/rtc-rx8025.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-rx8025.c b/drivers/rtc/rtc-rx8025.c index 18240f526ade..259995281e0d 100644 --- a/drivers/rtc/rtc-rx8025.c +++ b/drivers/rtc/rtc-rx8025.c @@ -146,8 +146,10 @@ static irqreturn_t rx8025_handle_irq(int irq, void *dev_id) { struct i2c_client *client = dev_id; struct rx8025_data *rx8025 = i2c_get_clientdata(client); + struct mutex *lock = &rx8025->rtc->ops_lock; int status; + mutex_lock(lock); status = rx8025_read_reg(client, RX8025_REG_CTRL2); if (status < 0) goto out; @@ -172,6 +174,8 @@ static irqreturn_t rx8025_handle_irq(int irq, void *dev_id) } out: + mutex_unlock(lock); + return IRQ_HANDLED; } |