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SubjectRe: [alsa-devel] [PATCH 3/4] ALSA: usb-audio: Use Class Specific EP for UAC3 devices.
Hi Jorge,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on sound/for-next]
[also build test WARNING on v4.17-rc1 next-20180420]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Jorge-Sanjuan/ALSA-usb-UAC3-new-features/20180423-015726
base: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> sound/usb/stream.c:597:26: sparse: restricted __le32 degrades to integer

vim +597 sound/usb/stream.c

544
545 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
546 struct usb_host_interface *alts,
547 int protocol, int iface_no)
548 {
549 /* parsed with a v1 header here. that's ok as we only look at the
550 * header first which is the same for both versions */
551 struct uac_iso_endpoint_descriptor *csep;
552 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
553 int attributes = 0;
554
555 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
556
557 /* Creamware Noah has this descriptor after the 2nd endpoint */
558 if (!csep && altsd->bNumEndpoints >= 2)
559 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
560
561 /*
562 * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
563 * bytes after the first endpoint, go search the entire interface.
564 * Some devices have it directly *before* the standard endpoint.
565 */
566 if (!csep)
567 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
568
569 if (!csep || csep->bLength < 7 ||
570 csep->bDescriptorSubtype != UAC_EP_GENERAL) {
571 usb_audio_warn(chip,
572 "%u:%d : no or invalid class specific endpoint descriptor\n",
573 iface_no, altsd->bAlternateSetting);
574 return 0;
575 }
576
577 switch (protocol) {
578 case UAC_VERSION_1:
579 attributes = csep->bmAttributes;
580 break;
581 case UAC_VERSION_2: {
582 struct uac2_iso_endpoint_descriptor *csep2 =
583 (struct uac2_iso_endpoint_descriptor *) csep;
584
585 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
586
587 /* emulate the endpoint attributes of a v1 device */
588 if (csep2->bmControls & UAC2_CONTROL_PITCH)
589 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
590 break;
591 }
592 case UAC_VERSION_3: {
593 struct uac3_iso_endpoint_descriptor *csep3 =
594 (struct uac3_iso_endpoint_descriptor *) csep;
595
596 /* emulate the endpoint attributes of a v1 device */
> 597 if (csep3->bmControls & UAC2_CONTROL_PITCH)
598 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
599 break;
600 }
601 }
602
603 return attributes;
604 }
605

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation

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