[alsa-devel] [RFC 4/5] compress: add the core file

[Dimitris Papastamos]

On Fri, Sep 02, 2011 at 11:36:24AM +0530, Vinod Koul wrote:
> This patch ads core.c, the file which implements the ioctls and
> registers the devices
> 
> Signed-off-by: Vinod Koul <vinod.koul at linux.intel.com>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> ---
>  sound/compress_offload/core.c |  632 +++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 632 insertions(+), 0 deletions(-)
>  create mode 100644 sound/compress_offload/core.c
> 
> diff --git a/sound/compress_offload/core.c b/sound/compress_offload/core.c
> new file mode 100644
> index 0000000..1797dba
> --- /dev/null

> +static int snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
> +{
> +	struct snd_compr_params *params;
> +	int retval;
> +
> +	if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
> +		/*
> +		 * we should allow parameter change only when stream has been
> +		 * opened not in other cases
> +		 */
> +		params = kmalloc(sizeof(*params), GFP_KERNEL);
> +		if (!params)
> +			return -ENOMEM;
> +		if (copy_from_user(&params, (void __user *)arg, sizeof(params)))
> +			return -EFAULT;

This should be copy_from_user(params, ...) and not &params.

Thanks,
Dimitris