CVS commit: src/sys/dev

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

Module Name:    src
Committed By:   riastradh
Date:           Sat Sep 24 11:06:03 UTC 2022

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

Log Message:
efi(4): Fix access to efi_isopen.

- Qualify efi_isopen with volatile.
- Ensure open has acquire ordering and close has release ordering.
- Use atomic_swap, not atomic_cas -- simpler and may be cheaper.
- Use atomic_store, not atomic_swap -- simpler and usually cheaper.

(Could maybe just use __cpu_simple_lock to avoid having to write out
these details.)


To generate a diff of this commit:
cvs rdiff -u -r1.3 -r1.4 src/sys/dev/efi.c

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