mirror of
https://github.com/torvalds/linux.git
synced 2026-10-02 09:24:02 +02:00
86cac980c9
The fixed-size components field in SNDRV_CTL_IOCTL_CARD_INFO can be too small on systems with many audio devices. Keep the existing struct snd_ctl_card_info ABI intact and add a new ioctl SNDRV_CTL_IOCTL_CARD_BYTES that carries a variable-length payload selected by a type discriminator. The first defined type SND_CTL_CARD_BTYPE_COMPONENTS returns the full components string. The ioctl is designed to be reused for other variable-length card payloads in the future. The user-space caller may set data_allocated == 0 (or data == NULL) to query the required length; otherwise the kernel copies the payload into the user buffer and writes back the actual length in data_len. When the legacy components field in struct snd_ctl_card_info is truncated, '>' is written just before the NUL terminator to signal to user-space that the full string is available via the new ioctl. card->components is now dynamically allocated and grown in 32 byte increments via krealloc(), capped at 512 bytes. Link: https://github.com/alsa-project/alsa-lib/pull/494 Suggested-by: Jaroslav Kysela <perex@perex.cz> Suggested-by: Takashi Iwai <tiwai@suse.com> Signed-off-by: Maciej Strozek <mstrozek@opensource.cirrus.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://patch.msgid.link/20260720103505.1860399-2-mstrozek@opensource.cirrus.com |
||
|---|---|---|
| .. | ||
| acpi | ||
| asm-generic | ||
| clocksource | ||
| crypto | ||
| cxl | ||
| drm | ||
| dt-bindings | ||
| hyperv | ||
| keys | ||
| kunit | ||
| kvm | ||
| linux | ||
| math-emu | ||
| media | ||
| memory | ||
| misc | ||
| net | ||
| pcmcia | ||
| ras | ||
| rdma | ||
| rv | ||
| scsi | ||
| soc | ||
| sound | ||
| target | ||
| trace | ||
| uapi | ||
| ufs | ||
| vdso | ||
| video | ||
| xen | ||
| Kbuild | ||