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sound: usx2y: move to use usb_control_msg_send() 

The usb_control_msg_send() call can handle data on the stack, as well as
returning an error if a "short" write happens, so move the driver over
to using that call instead.  This ends up removing a helper function
that is no longer needed.

Cc: Jaroslav Kysela <perex@perex.cz>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20200914153756.3412156-7-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2020-09-14 17:37:51 +02:00
parent be40c36641
commit ec8eeceb06
1 changed files with 8 additions and 34 deletions
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42
sound/usb/usx2y/us122l.c
View File

@ -82,40 +82,13 @@ static int us144_create_usbmidi(struct snd_card *card)
&US122L(card)->midi_list, &quirk);
}
/*
* Wrapper for usb_control_msg().
* Allocates a temp buffer to prevent dmaing from/to the stack.
*/
static int us122l_ctl_msg(struct usb_device *dev, unsigned int pipe,
__u8 request, __u8 requesttype,
__u16 value, __u16 index, void *data,
__u16 size, int timeout)
{
int err;
void *buf = NULL;
if (size > 0) {
buf = kmemdup(data, size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
}
err = usb_control_msg(dev, pipe, request, requesttype,
value, index, buf, size, timeout);
if (size > 0) {
memcpy(data, buf, size);
kfree(buf);
}
return err;
}
static void pt_info_set(struct usb_device *dev, u8 v)
{
int ret;
ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
'I',
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
v, 0, NULL, 0, 1000);
ret = usb_control_msg_send(dev, 0, 'I',
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
v, 0, NULL, 0, 1000);
snd_printdd(KERN_DEBUG "%i\n", ret);
}
@ -305,10 +278,11 @@ static int us122l_set_sample_rate(struct usb_device *dev, int rate)
data[0] = rate;
data[1] = rate >> 8;
data[2] = rate >> 16;
err = us122l_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep, data, 3, 1000);
if (err < 0)
err = usb_control_msg_send(dev, 0, UAC_SET_CUR,
USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep, data, 3,
1000);
if (err)
snd_printk(KERN_ERR "%d: cannot set freq %d to ep 0x%x\n",
dev->devnum, rate, ep);
return err;