ALSA: usb-audio: Refine string-descriptor-based quirk matching

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Remove snd_usb_get_string() and use the manufacturer and product strings
stored in struct usb_device directly to match quirk table entries. Their
NULLity can be checked to determine if the device has no these strings.
This simplifies the code a lot.

Meanwhile, allow quirk table entries to match "no string" explicitly, and
add appropriate comments to show the expected usages of
DEVICE_STRING_FLG() and VENDOR_STRING_FLG(). These changes are tiny and
doesn't form another separate patch, so that back-and-forth changes can
be avoided.

Suggested-by: Terry Junge <linuxsound@cosmicgizmosystems.com>
Link: https://lore.kernel.org/r/b59da54a-9c80-4212-a337-c5ea98da52d1@cosmicgizmosystems.com
Signed-off-by: Rong Zhang <i@rong.moe>
Link: https://patch.msgid.link/20260305174711.1106324-1-i@rong.moe
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Rong Zhang 2026-03-06 01:46:39 +08:00 • committed by Takashi Iwai

parent b364a0d23c

commit 9558a2cbec

1 changed files with 40 additions and 50 deletions

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sound/usb/quirks.c

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