diff options
| author |   Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2015-02-10 19:06:10 +0200 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2015-03-07 01:08:26 +0100 |
| commit | ebf2ef8f613433aaffac53aef2f6703445821fc6 (patch) | |
| tree | f6e0d87de4c2532d3bab76885038a13159a7c844 | |
| parent | i2c: designware-baytrail: cross-check lock functions (diff) | |
| download | linux-dev-ebf2ef8f613433aaffac53aef2f6703445821fc6.tar.xz linux-dev-ebf2ef8f613433aaffac53aef2f6703445821fc6.zip | |
i2c: designware-baytrail: baytrail_i2c_acquire() might sleep
This patch marks baytrail_i2c_acquire() that it might sleep. Also it chages
while-loop to do-while and, though it is matter of taste, gives a chance to
check one more time before report a timeout.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: David E. Box <david.e.box@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-baytrail.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-designware-baytrail.c b/drivers/i2c/busses/i2c-designware-baytrail.c index 036d9bdc0aaa..7d7ae97476e2 100644 --- a/drivers/i2c/busses/i2c-designware-baytrail.c +++ b/drivers/i2c/busses/i2c-designware-baytrail.c @@ -68,6 +68,8 @@ static int baytrail_i2c_acquire(struct dw_i2c_dev *dev) int ret; unsigned long start, end; + might_sleep(); + if (!dev || !dev->dev) return -ENODEV; @@ -85,7 +87,7 @@ static int baytrail_i2c_acquire(struct dw_i2c_dev *dev) /* host driver waits for bit 0 to be set in semaphore register */ start = jiffies; end = start + msecs_to_jiffies(SEMAPHORE_TIMEOUT); - while (!time_after(jiffies, end)) { + do { ret = get_sem(dev->dev, &sem); if (!ret && sem) { acquired = jiffies; @@ -95,7 +97,7 @@ static int baytrail_i2c_acquire(struct dw_i2c_dev *dev) } usleep_range(1000, 2000); - } + } while (time_before(jiffies, end)); dev_err(dev->dev, "punit semaphore timed out, resetting\n"); reset_semaphore(dev->dev); |