CVS commit: src/sys/dev/usb

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sun Mar 20 13:18:30 UTC 2022

Modified Files:
        src/sys/dev/usb: ualea.c

Log Message:
ualea(4): Enter the data under the softc lock.

This avoids a race with a concurrent ualea_get updating sc_needed,
which could lead to hang when requesting more entropy.

ualea(4) now survives

sysctl -w kern.entropy.depletion=1
cat </dev/random >/dev/null &
cat </dev/random >/dev/null &

without hanging for longer (even if yanked and reinserted in the
middle, although the detach path is not relevant to the bug this
change fixes).


To generate a diff of this commit:
cvs rdiff -u -r1.18 -r1.19 src/sys/dev/usb/ualea.c

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