Re: [PATCH 8/9] ALSA: usx2y: usbusx2yaudio: use usb_fill_int_urb()

[Takashi Iwai <tiwai@suse.de>]

On Wed, 20 Jun 2018 17:47:01 +0200,
Sebastian Andrzej Siewior wrote:
> 
> On 2018-06-20 17:38:44 [+0200], To Takashi Iwai wrote:
> > okay, as you wish:
> 
> I'm sorry, I compiled one patch and send the other. Here is the fixed
> one.

Well, you seem to have forgotten to update the changelog...

Don't need to rush, it's a change for 4.19.


thanks,

Takashi

> 
> > > thanks,
> > > 
> > > Takashi
> > 
> ----------- >8
> Subject: [PATCH 8/9 v4] ALSA: usx2y: usbusx2yaudio: use usb_fill_int_urb()
> 
> Using usb_fill_int_urb() helps to find code which initializes an
> URB. A grep for members of the struct (like ->complete) reveal lots
> of other things, too.
> 
> The "&& !(*purb)->transfer_buffer" check has been removed because the
> URB has been freshly allocated a few lines above so ->transfer_buffer
> has to be NULL here.
> The `dev' and `transfer_size' assignments have been moved from
> usX2Y_urbs_start() to usX2Y_urbs_allocate() because they don't change
> overtime.
> The multiplication via check_mul_overflow() has been extracted from
> kmalloc_array() to avoid two multiplication (one with overflow check and
> one without for the length argument). This requires to change the type
> `maxpacksize' to int so there is only one type involved in the
> multiplication.
> 
> Cc: Jaroslav Kysela <perex@perex.cz>
> Cc: Takashi Iwai <tiwai@suse.com>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> ---
>  sound/usb/usx2y/usbusx2yaudio.c | 23 +++++++++++------------
>  1 file changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c
> index 2b833054e3b0..de3a21444db3 100644
> --- a/sound/usb/usx2y/usbusx2yaudio.c
> +++ b/sound/usb/usx2y/usbusx2yaudio.c
> @@ -425,6 +425,9 @@ static int usX2Y_urbs_allocate(struct snd_usX2Y_substream *subs)
>  	/* allocate and initialize data urbs */
>  	for (i = 0; i < NRURBS; i++) {
>  		struct urb **purb = subs->urb + i;
> +		void *buf = NULL;
> +		int len = 0;
> +
>  		if (*purb) {
>  			usb_kill_urb(*purb);
>  			continue;
> @@ -434,22 +437,20 @@ static int usX2Y_urbs_allocate(struct snd_usX2Y_substream *subs)
>  			usX2Y_urbs_release(subs);
>  			return -ENOMEM;
>  		}
> -		if (!is_playback && !(*purb)->transfer_buffer) {
> +
> +		if (!is_playback) {
>  			/* allocate a capture buffer per urb */
> -			(*purb)->transfer_buffer =
> -				kmalloc_array(subs->maxpacksize,
> -					      nr_of_packs(), GFP_KERNEL);
> -			if (NULL == (*purb)->transfer_buffer) {
> +			buf = kmalloc_array(subs->maxpacksize, nr_of_packs(),
> +					    GFP_KERNEL);
> +			if (!buf) {
>  				usX2Y_urbs_release(subs);
>  				return -ENOMEM;
>  			}
> +			len = subs->maxpacksize * nr_of_packs();
>  		}
> -		(*purb)->dev = dev;
> -		(*purb)->pipe = pipe;
> +		usb_fill_int_urb(*purb, dev, pipe, buf, len,
> +				 i_usX2Y_subs_startup, subs, 1);
>  		(*purb)->number_of_packets = nr_of_packs();
> -		(*purb)->context = subs;
> -		(*purb)->interval = 1;
> -		(*purb)->complete = i_usX2Y_subs_startup;
>  	}
>  	return 0;
>  }
> @@ -485,12 +486,10 @@ static int usX2Y_urbs_start(struct snd_usX2Y_substream *subs)
>  			unsigned long pack;
>  			if (0 == i)
>  				atomic_set(&subs->state, state_STARTING3);
> -			urb->dev = usX2Y->dev;
>  			for (pack = 0; pack < nr_of_packs(); pack++) {
>  				urb->iso_frame_desc[pack].offset = subs->maxpacksize * pack;
>  				urb->iso_frame_desc[pack].length = subs->maxpacksize;
>  			}
> -			urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs(); 
>  			if ((err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
>  				snd_printk (KERN_ERR "cannot submit datapipe for urb %d, err = %d\n", i, err);
>  				err = -EPIPE;
> -- 
> 2.17.1
>