i2c: smbus: Don't filter out duplicate alerts

Getting the same alert twice in a row is legal and normal,
especially on a fast device (like running in qemu). Kind of
like interrupts. So don't report duplicate alerts, and deliver
them normally.

[JD: Fixed subject]

Signed-off-by: Corey Minyard <[e-mail]>
Signed-off-by: Jean Delvare <[e-mail]>
Reviewed-by: Benjamin Tissoires <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

drivers/i2c/i2c-smbus.c

···
 {
 	struct i2c_smbus_alert *alert = d;
 	struct i2c_client *ara;
-	unsigned short prev_addr = 0;	/* Not a valid address */
 
 	ara = alert->ara;
 
···
 		data.addr = status >> 1;
 		data.type = I2C_PROTOCOL_SMBUS_ALERT;
 
-		if (data.addr == prev_addr) {
-			dev_warn(&ara->dev, "Duplicate SMBALERT# from dev "
-				"0x%02x, skipping\n", data.addr);
-			break;
-		}
 		dev_dbg(&ara->dev, "SMBALERT# from dev 0x%02x, flag %d\n",
 			data.addr, data.data);
 
 		/* Notify driver for the device which issued the alert */
 		device_for_each_child(&ara->adapter->dev, &data,
 				      smbus_do_alert);
-		prev_addr = data.addr;
 	}
 
 	return IRQ_HANDLED;