tree 8fcf397c504fadbebecde09901aacef06b4551d8
parent c9583e55fa2b08a230c549bd1e3c0bde6c50d9cc
author Heiko Carstens <heiko.carstens@de.ibm.com> 1224687626 -0500
committer Rusty Russell <rusty@rustcorp.com.au> 1224630026 +1100

stop_machine: fix error code handling on multiple cpus

Using |= for updating a value which might be updated on several cpus
concurrently will not always work since we need to make sure that the
update happens atomically.
To fix this just use a write if the called function returns an error
code on a cpu. We end up writing the error code of an arbitrary cpu
if multiple ones fail but that should be sufficient.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>