From ebf2ef8f613433aaffac53aef2f6703445821fc6 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Tue, 10 Feb 2015 19:06:10 +0200 Subject: [PATCH] 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 Acked-by: David E. Box Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-designware-baytrail.c | 6 ++++-- 1 file 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); -- 2.20.1