[DEBUG PATCH] Print a message when a spurious i2c SCL timeout occurs.

[Ville Syrjälä]

A quick hack to verify that the fix works as intended...

Do not apply.

---
 drivers/i2c/algos/i2c-algo-bit.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c
index d25112e..3f547b5 100644
--- a/drivers/i2c/algos/i2c-algo-bit.c
+++ b/drivers/i2c/algos/i2c-algo-bit.c
@@ -89,6 +89,7 @@ static inline void scllo(struct i2c_algo_bit_data *adap)
 static int sclhi(struct i2c_algo_bit_data *adap)
 {
        unsigned long start;
+       bool timeout = false;

        setscl(adap, 1);

@@ -104,11 +105,16 @@ static int sclhi(struct i2c_algo_bit_data *adap)
                 * are processing data internally.
                 */
                if (time_after(jiffies, start + adap->timeout))
+               {
+                       timeout = true;
                        break;
+               }
                cond_resched();
        }
        if (!getscl(adap))
                return -ETIMEDOUT;
+       if (timeout)
+               printk(KERN_CRIT "spurious i2c scl timeout\n");
 #ifdef DEBUG
        if (jiffies != start && i2c_debug >= 3)
                pr_debug("i2c-algo-bit: needed %ld jiffies for SCL to go "
-- 
1.7.3.4