[vlc-devel] [PATCH 1/2] V4L2: Open devices only once.

Rémi Denis-Courmont remi at remlab.net
Thu Aug 4 11:03:01 CEST 2011

On Thu,  4 Aug 2011 09:53:51 +0200, Thierry Reding
<thierry.reding at avionic-design.de> wrote:
> Instead of opening the device once for probing purposes and opening it
> again when it has been determined suitable, this commit takes the file
> descriptor obtained during probing and passes it to the initialization
> function.

You really should keep the file descriptor in a local variable. With your
patch, the compiler will load the file descriptor from memory again and
again as (v4l2_)ioctl() acts a memory barrier.

>      if( i_fd >= 0 ) v4l2_close( i_fd );
> -    return false;
> +    return VLC_EGENERIC;

You really should use -1 for this.

Rémi Denis-Courmont

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