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authorVitaly Kuznetsov <vkuznets@redhat.com>2016-01-28 09:29:35 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-08 08:34:12 +0300
commit415719160de3fae3bb9cbc617664649919cd00d0 (patch)
treebf877b7cbe41b2e137b52ab584310e3c1605597b /include/video/pmagb-b-fb.h
parent79fd8e706637a5c7c41f9498fe0fbfb437abfdc8 (diff)
downloadlinux-415719160de3fae3bb9cbc617664649919cd00d0.tar.xz
Drivers: hv: vmbus: avoid scheduling in interrupt context in vmbus_initiate_unload()
We have to call vmbus_initiate_unload() on crash to make kdump work but the crash can also be happening in interrupt (e.g. Sysrq + c results in such) where we can't schedule or the following will happen: [ 314.905786] bad: scheduling from the idle thread! Just skipping the wait (and even adding some random wait here) won't help: to make host-side magic working we're supposed to receive CHANNELMSG_UNLOAD (and actually confirm the fact that we received it) but we can't use interrupt-base path (vmbus_isr()-> vmbus_on_msg_dpc()). Implement a simple busy wait ignoring all the other messages and use it if we're in an interrupt context. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/video/pmagb-b-fb.h')
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