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| author | Wolfram Sang <w.sang@pengutronix.de> | 2009-03-28 21:34:45 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2009-03-28 21:34:45 +0100 |
| commit | 8e99ada8deaa9033600cd2c7d0a9366b0e99ab68 (patch) | |
| tree | 20784a41011e58f7ba6497d7a3763781b8a3d460 /drivers/i2c/algos/i2c-algo-pca.c | |
| parent | eff9ec95efaaf6b12d230f0ea7d3c295d3bc9d57 (diff) | |
| download | linux-stable-8e99ada8deaa9033600cd2c7d0a9366b0e99ab68.tar.gz linux-stable-8e99ada8deaa9033600cd2c7d0a9366b0e99ab68.tar.bz2 linux-stable-8e99ada8deaa9033600cd2c7d0a9366b0e99ab68.zip | |
i2c-algo-pca: Rework waiting for a free bus
Waiting for a free bus now accepts the timeout value in jiffies and does
proper checking using time_before.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c/algos/i2c-algo-pca.c')
| -rw-r--r-- | drivers/i2c/algos/i2c-algo-pca.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c index a8e51bd1a4f5..9e134fad7bda 100644 --- a/drivers/i2c/algos/i2c-algo-pca.c +++ b/drivers/i2c/algos/i2c-algo-pca.c @@ -22,6 +22,7 @@ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/delay.h> +#include <linux/jiffies.h> #include <linux/init.h> #include <linux/errno.h> #include <linux/i2c.h> @@ -186,14 +187,16 @@ static int pca_xfer(struct i2c_adapter *i2c_adap, int numbytes = 0; int state; int ret; - int timeout = i2c_adap->timeout; + unsigned long timeout = jiffies + i2c_adap->timeout; - while ((state = pca_status(adap)) != 0xf8 && timeout--) { - msleep(10); - } - if (state != 0xf8) { - dev_dbg(&i2c_adap->dev, "bus is not idle. status is %#04x\n", state); - return -EAGAIN; + while (pca_status(adap) != 0xf8) { + if (time_before(jiffies, timeout)) { + msleep(10); + } else { + dev_dbg(&i2c_adap->dev, "bus is not idle. status is " + "%#04x\n", state); + return -EAGAIN; + } } DEB1("{{{ XFER %d messages\n", num); |