diff mbox

staging: bcm2835-camera: free first element in array

Message ID 20170215122523.GA12198@mwanda (mailing list archive)
State New, archived
Headers show

Commit Message

Dan Carpenter Feb. 15, 2017, 12:25 p.m. UTC 
We should free gdev[0] so the > should be >=.

Fixes: 7b3ad5abf027 ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Comments

Walter Harms Feb. 15, 2017, 12:47 p.m. UTC | #1 
Am 15.02.2017 13:25, schrieb Dan Carpenter:
> We should free gdev[0] so the > should be >=.
> 
> Fixes: 7b3ad5abf027 ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> 
> diff --git a/drivers/staging/media/platform/bcm2835/bcm2835-camera.c b/drivers/staging/media/platform/bcm2835/bcm2835-camera.c
> index ca15a698e018..9bcd8e546a14 100644
> --- a/drivers/staging/media/platform/bcm2835/bcm2835-camera.c
> +++ b/drivers/staging/media/platform/bcm2835/bcm2835-camera.c
> @@ -1998,7 +1998,7 @@ static int __init bm2835_mmal_init(void)
>  free_dev:
>  	kfree(dev);
>  
> -	for ( ; camera > 0; camera--) {
> +	for ( ; camera >= 0; camera--) {
>  		bcm2835_cleanup_instance(gdev[camera]);
>  		gdev[camera] = NULL;
>  	}

since we already know that programmers are bad in counting backwards ...

is is possible to change that into std. loop like:

 for(i=0, i< camera; i++ {
	bcm2835_cleanup_instance(gdev[i]);
	gdev[i] = NULL;
  	}

this is way a much more common pattern.


just my 2 cents,
re,
 wh
Dan Carpenter Feb. 16, 2017, 12:03 p.m. UTC | #2 
On Wed, Feb 15, 2017 at 01:47:55PM +0100, walter harms wrote:
> 
> 
> Am 15.02.2017 13:25, schrieb Dan Carpenter:
> > We should free gdev[0] so the > should be >=.
> > 
> > Fixes: 7b3ad5abf027 ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.")
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> > 
> > diff --git a/drivers/staging/media/platform/bcm2835/bcm2835-camera.c b/drivers/staging/media/platform/bcm2835/bcm2835-camera.c
> > index ca15a698e018..9bcd8e546a14 100644
> > --- a/drivers/staging/media/platform/bcm2835/bcm2835-camera.c
> > +++ b/drivers/staging/media/platform/bcm2835/bcm2835-camera.c
> > @@ -1998,7 +1998,7 @@ static int __init bm2835_mmal_init(void)
> >  free_dev:
> >  	kfree(dev);
> >  
> > -	for ( ; camera > 0; camera--) {
> > +	for ( ; camera >= 0; camera--) {
> >  		bcm2835_cleanup_instance(gdev[camera]);
> >  		gdev[camera] = NULL;
> >  	}
> 
> since we already know that programmers are bad in counting backwards ...
> 
> is is possible to change that into std. loop like:
> 
>  for(i=0, i< camera; i++ {
> 	bcm2835_cleanup_instance(gdev[i]);
> 	gdev[i] = NULL;
>   	}
> 
> this is way a much more common pattern.

Hm...  My patch is buggy.  It frees the wong thing on the first
iteration through the loop.  I'll resend.

regards,
dan carpenter
diff mbox

Patch

diff --git a/drivers/staging/media/platform/bcm2835/bcm2835-camera.c b/drivers/staging/media/platform/bcm2835/bcm2835-camera.c
index ca15a698e018..9bcd8e546a14 100644
--- a/drivers/staging/media/platform/bcm2835/bcm2835-camera.c
+++ b/drivers/staging/media/platform/bcm2835/bcm2835-camera.c
@@ -1998,7 +1998,7 @@  static int __init bm2835_mmal_init(void)
 free_dev:
 	kfree(dev);
 
-	for ( ; camera > 0; camera--) {
+	for ( ; camera >= 0; camera--) {
 		bcm2835_cleanup_instance(gdev[camera]);
 		gdev[camera] = NULL;
 	}