[PATCH] cx18: Fix the handling of i2c bus registration error

[Jean Delvare <khali@linux-fr.org>]

* Return actual error values as returned by the i2c subsystem, rather
  than 0 or 1.
* If the registration of the second bus fails, unregister the first one
  before exiting, otherwise we are leaking resources.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Acked-by: Andy Walls <awalls@radix.net>
---
Mauro, can you please apply this fix now?

 linux/drivers/media/video/cx18/cx18-i2c.c |   16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

--- v4l-dvb.orig/linux/drivers/media/video/cx18/cx18-i2c.c	2009-03-01 16:09:09.000000000 +0100
+++ v4l-dvb/linux/drivers/media/video/cx18/cx18-i2c.c	2009-04-03 18:45:18.000000000 +0200
@@ -214,7 +214,7 @@ static struct i2c_algo_bit_data cx18_i2c
 /* init + register i2c algo-bit adapter */
 int init_cx18_i2c(struct cx18 *cx)
 {
-	int i;
+	int i, err;
 	CX18_DEBUG_I2C("i2c init\n");
 
 	for (i = 0; i < 2; i++) {
@@ -273,8 +273,18 @@ int init_cx18_i2c(struct cx18 *cx)
 	cx18_call_hw(cx, CX18_HW_GPIO_RESET_CTRL,
 		     core, reset, (u32) CX18_GPIO_RESET_I2C);
 
-	return i2c_bit_add_bus(&cx->i2c_adap[0]) ||
-		i2c_bit_add_bus(&cx->i2c_adap[1]);
+	err = i2c_bit_add_bus(&cx->i2c_adap[0]);
+	if (err)
+		goto err;
+	err = i2c_bit_add_bus(&cx->i2c_adap[1]);
+	if (err)
+		goto err_del_bus_0;
+	return 0;
+
+ err_del_bus_0:
+ 	i2c_del_adapter(&cx->i2c_adap[0]);
+ err:
+	return err;
 }
 
 void exit_cx18_i2c(struct cx18 *cx)


-- 
Jean Delvare