Drivers: hv: vmbus: serialize process_chn_event() and vmbus_close_internal()

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[ Upstream commit 63d55b2aeb ]

process_chn_event(), running in the tasklet, can race with
vmbus_close_internal() in the case of SMP guest, e.g., when the former is
accessing channel->inbound.ring_buffer, the latter could be freeing the
ring_buffer pages.

To resolve the race, we can serialize them by disabling the tasklet when
the latter is running here.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Dexuan Cui 2015-12-14 16:01:47 -08:00 • committed by Greg Kroah-Hartman

parent bf59c816fb

commit ff83d7914b

1 changed files with 19 additions and 2 deletions

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drivers/hv/channel.c

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