CVS commit: src/sys/dev/audio

["Tetsuya Isaki" <isaki%netbsd.org@localhost>]

Module Name:    src
Committed By:   isaki
Date:           Sat Mar 26 06:27:32 UTC 2022

Modified Files:
        src/sys/dev/audio: audio.c

Log Message:
Fix conditions that audio_read() calls audio_track_record().
audio_track_record() must be called when usrbuf has at least one free block.

I hope that this will fix the panic reported in PR kern/56644.
When an user process specifies the hardware format as its recording format
(i.e., there is no track conversions), if the user process read(2) a small
amount of data and the rmixer_process then runs, depending on the conditions,
the panic may happen.  I have never reproduced it because it's difficult to
do intentionally.

Thanks Y.Sugahara and riastradh@ for help and comments.


To generate a diff of this commit:
cvs rdiff -u -r1.115 -r1.116 src/sys/dev/audio/audio.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.