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authorDexuan Cui <decui@microsoft.com>2020-01-26 08:49:44 +0300
committerSasha Levin <sashal@kernel.org>2020-01-27 06:10:17 +0300
commit54e19d34011fea26d39aa74781131de0ce642a01 (patch)
tree3d0913466b3f1cc1f90338f44bc635d73d8809f0 /Documentation/devicetree/bindings/gpio/ibm,ppc4xx-gpio.txt
parentffd1d4a49336b7f0078f45332fa4b93d25720f6c (diff)
downloadlinux-54e19d34011fea26d39aa74781131de0ce642a01.tar.xz
hv_utils: Add the support of hibernation
Add util_pre_suspend() and util_pre_resume() for some hv_utils devices (e.g. kvp/vss/fcopy), because they need special handling before util_suspend() calls vmbus_close(). For kvp, all the possible pending work items should be cancelled. For vss and fcopy, some extra clean-up needs to be done, i.e. fake a THAW message for hv_vss_daemon and fake a CANCEL_FCOPY message for hv_fcopy_daemon, otherwise when the VM resums back, the daemons can end up in an inconsistent state (i.e. the file systems are frozen but will never be thawed; the file transmitted via fcopy may not be complete). Note: there is an extra patch for the daemons: "Tools: hv: Reopen the devices if read() or write() returns errors", because the hv_utils driver can not guarantee the whole transaction finishes completely once util_suspend() starts to run (at this time, all the userspace processes are frozen). util_probe() disables channel->callback_event to avoid the race with the channel callback. Signed-off-by: Dexuan Cui <decui@microsoft.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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