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authorNeilBrown <neilb@suse.de>2012-04-01 20:19:30 +1000
committerJiri Kosina <jkosina@suse.cz>2012-04-03 03:42:36 +0200
commitf283d22713b0bdc147097c92c9b45855339cf1c8 (patch)
treefee788fb13479ebe013eae8c9a4b621d6ccd3057 /arch/sparc/kernel
parentb4a133da2eaccb844a7beaef16ffd9c76a0d21d3 (diff)
downloadtalos-op-linux-f283d22713b0bdc147097c92c9b45855339cf1c8.tar.gz
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APM: fix deadlock in APM_IOC_SUSPEND ioctl
I found the Xorg server on my ARM device stuck in the 'msleep()' loop in apm_ioctl. I suspect it had attempted suspend immediately after resuming and lost a race. During that msleep(10);, a new suspend cycle must have started and changed ->suspend_state to SUSPEND_PENDING, so it was never seen to be SUSPEND_DONE and the loop could never exited. It would have moved on to SUSPEND_ACKTO but never been able to reach SUSPEND_DONE. So change the loop to only run while SUSPEND_ACKED rather than until SUSPEND_DONE. This is much safer. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'arch/sparc/kernel')
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