| Message ID | 20180619215521.13688-9-bigeasy@linutronix.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, 19 Jun 2018 23:55:20 +0200, Sebastian Andrzej Siewior wrote: > > 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. > > 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 | 21 +++++++++------------ > 1 file changed, 9 insertions(+), 12 deletions(-) > > diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c > index 2b833054e3b0..9a49bdb07508 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; > + unsigned int len = 0; > + > if (*purb) { > usb_kill_urb(*purb); > continue; > @@ -434,22 +437,18 @@ 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) { > + len = subs->maxpacksize * nr_of_packs(); > + buf = kmalloc(len, GFP_KERNEL); I'd keep kmalloc_array() as is, and just put subs->maxpacksize * nr_of_packs() in usb_fill_int_urb(). Otherwise it's a step backward. thanks, Takashi -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c index 2b833054e3b0..9a49bdb07508 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; + unsigned int len = 0; + if (*purb) { usb_kill_urb(*purb); continue; @@ -434,22 +437,18 @@ 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) { + len = subs->maxpacksize * nr_of_packs(); + buf = kmalloc(len, GFP_KERNEL); + if (!buf) { usX2Y_urbs_release(subs); return -ENOMEM; } } - (*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 +484,10 @@ 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;
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. 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 | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-)