workqueues: do CPU_UP_CANCELED if CPU_UP_PREPARE fails
authorOleg Nesterov <oleg@tv-sign.ru>
Fri, 25 Jul 2008 08:47:54 +0000 (01:47 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 25 Jul 2008 17:53:41 +0000 (10:53 -0700)
commit8448502cfc915f70e3f8923849ade27d472044cb
tree964522eb36ea5424ece910092da5dce773c1f6cc
parent8de6d308bab4f67fcf953562f9f08f9527cad72d
workqueues: do CPU_UP_CANCELED if CPU_UP_PREPARE fails

The bug was pointed out by Akinobu Mita <akinobu.mita@gmail.com>, and this
patch is based on his original patch.

workqueue_cpu_callback(CPU_UP_PREPARE) expects that if it returns
NOTIFY_BAD, _cpu_up() will send CPU_UP_CANCELED then.

However, this is not true since

"cpu hotplug: cpu: deliver CPU_UP_CANCELED only to NOTIFY_OKed callbacks with CPU_UP_PREPARE"
commit: a0d8cdb652d35af9319a9e0fb7134de2a276c636

The callback which has returned NOTIFY_BAD will not receive
CPU_UP_CANCELED.  Change the code to fulfil the CPU_UP_CANCELED logic if
CPU_UP_PREPARE fails.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Reported-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/workqueue.c