Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...

[sfrench/cifs-2.6.git] / drivers / i2c / i2c-core.c

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 26488aa893d5e5dc62ac2d01c332dd2d4ca9d2a1..2efa56c5ff2c32d10ff3018def5bc077b8492e4e 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1311,6 +1311,37 @@ module_exit(i2c_exit);
  * ----------------------------------------------------
  */
 
+/**
+ * __i2c_transfer - unlocked flavor of i2c_transfer
+ * @adap: Handle to I2C bus
+ * @msgs: One or more messages to execute before STOP is issued to
+ *     terminate the operation; each message begins with a START.
+ * @num: Number of messages to be executed.
+ *
+ * Returns negative errno, else the number of messages executed.
+ *
+ * Adapter lock must be held when calling this function. No debug logging
+ * takes place. adap->algo->master_xfer existence isn't checked.
+ */
+int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+{
+       unsigned long orig_jiffies;
+       int ret, try;
+
+       /* Retry automatically on arbitration loss */
+       orig_jiffies = jiffies;
+       for (ret = 0, try = 0; try <= adap->retries; try++) {
+               ret = adap->algo->master_xfer(adap, msgs, num);
+               if (ret != -EAGAIN)
+                       break;
+               if (time_after(jiffies, orig_jiffies + adap->timeout))
+                       break;
+       }
+
+       return ret;
+}
+EXPORT_SYMBOL(__i2c_transfer);
+
 /**
  * i2c_transfer - execute a single or combined I2C message
  * @adap: Handle to I2C bus
@@ -1325,8 +1356,7 @@ module_exit(i2c_exit);
  */
 int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 {
-       unsigned long orig_jiffies;
-       int ret, try;
+       int ret;
 
        /* REVISIT the fault reporting model here is weak:
         *
@@ -1364,15 +1394,7 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
                        i2c_lock_adapter(adap);
                }
 
-               /* Retry automatically on arbitration loss */
-               orig_jiffies = jiffies;
-               for (ret = 0, try = 0; try <= adap->retries; try++) {
-                       ret = adap->algo->master_xfer(adap, msgs, num);
-                       if (ret != -EAGAIN)
-                               break;
-                       if (time_after(jiffies, orig_jiffies + adap->timeout))
-                               break;
-               }
+               ret = __i2c_transfer(adap, msgs, num);
                i2c_unlock_adapter(adap);
 
                return ret;