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authorIgor Mammedov <imammedo@redhat.com>2013-05-14 16:46:07 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-21 10:15:40 -0700
commit1c4e2d70afb132058bfe979f6854c1d0a732b556 (patch)
tree8d55e281a29fb7a9822b3e19ae9445664098caa4 /fs/xfs/xfs_log_cil.c
parentc055da9fbad4b63bb3169f2b1a8b7ad429270bd0 (diff)
downloadlinux-1c4e2d70afb132058bfe979f6854c1d0a732b556.tar.bz2
cpu: make sure that cpu/online file created before KOBJ_ADD is emitted
It fixes race between udev and hotplugged CPU registration by defining "online" attribute statically, so that device_add() would create it before notifying udev about new CPU. Original issue report is at https://lkml.org/lkml/2012/4/30/198 " > On Mon, Apr 30, 2012 at 11:36:23AM -0400, Konrad Rzeszutek Wilk wrote: > > Hey Greg, > > > > Hoping you can help with some guidance on how to fix this. > > > > The issue is with CPU hotplug is that when a CPU goes up > > it calls 'arch_register_cpu' which eventually calls > > register_cpu. That function does these two things: > > > > 251 error = device_register(&cpu->dev); > > 252 if (!error && cpu->hotpluggable) > > 253 register_cpu_control(cpu); > > > > and the device_register creates a nice little SysFS directory: > > > > /sys/devices/system/cpu/cpu2/ which at line 251 has the 'add' attribute > > but no 'online' attribute. udev then tries to echo 1 to the 'online' > > and it we get: > > udevd-work[2421]: error opening ATTR{/sys/devices/system/cpu/cpu2/online} for writing: No such file or directory > > > > Line 253 creates said 'online' and at that time udev [or the system admin] > > can write 1 to 'online' and the CPU goes up. > > > > So .. any thoughts? Is there some way to inhibit from uevent being sent > > until line 253 has run? " Signed-off-by: Igor Mammedov <imammedo@redhat.com> Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/xfs/xfs_log_cil.c')
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