Module Name: src
Committed By: riastradh
Date: Sun Mar 6 09:03:42 UTC 2022
Modified Files:
src/sys/dev/usb: usb.c
Log Message:
usb(4): Use atomics for usb_async_proc.
This is written under proc_lock and read without it in usb_add_event,
so using atomics pacifies the sanitizer. No memory ordering needed
because the value isn't actually used until the softint runs, using
it under proc_lock. Kind of a micro-optimization, but let's avoid
contention on proc_lock in the common case of no usb_async_proc set
up (why is this a system global, anyway? and why is there a softint
if usb_add_event always runs at IPL_NONE?).
Reported-by: syzbot+1b2fa68535e5b0f3d...@syzkaller.appspotmail.com
To generate a diff of this commit:
cvs rdiff -u -r1.198 -r1.199 src/sys/dev/usb/usb.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
