ALSA: pcm: Notify disconnected state at mmap data fault, too

When a device gets disconnected, the driver waits until the all opened
file descriptors are closed before releasing the device.  Although PCM
core emits an error to any further syscalls (except for close), some
applications don't notice the disconnected state because they mainly
access only via mmap, and it may block the device release
unnecessarily too long.

This patch is an attempt to improve the behavior by adding the
notification of the PCM disconnected state at mmap data faulting.
When the device is disconnected, it now returns VM_FAULT_SIGBUS, so
that the application can notice the invalid PCM state.

Reported-and-tested-by: Ai Chao <aichao@kylinos.cn>
Link: https://lore.kernel.org/20260615132657.2097213-1-aichao@kylinos.cn>
Link: https://patch.msgid.link/20260619150035.1560937-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

0 files changed, 0 insertions, 0 deletions