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| author | K. Y. Srinivasan <kys@microsoft.com> | 2014-08-28 18:29:53 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-23 23:31:21 -0700 |
| commit | 2115b5617adf2eecca49e78f3810f359ddc5c396 (patch) | |
| tree | 78deae37a3debee67b4cd30b54d948ad3cc1c8ab /drivers/hv/channel.c | |
| parent | b29ef3546aecb253a5552b198cef23750d56e1e4 (diff) | |
| download | op-kernel-dev-2115b5617adf2eecca49e78f3810f359ddc5c396.zip op-kernel-dev-2115b5617adf2eecca49e78f3810f359ddc5c396.tar.gz | |
Drivers: hv: vmbus: Properly protect calls to smp_processor_id()
Disable preemption when sampling current processor ID when preemption
is otherwise possible.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/channel.c')
| -rw-r--r-- | drivers/hv/channel.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index 19bad59..433f72a 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -486,11 +486,14 @@ static int vmbus_close_internal(struct vmbus_channel *channel) channel->state = CHANNEL_OPEN_STATE; channel->sc_creation_callback = NULL; /* Stop callback and cancel the timer asap */ - if (channel->target_cpu != smp_processor_id()) + if (channel->target_cpu != get_cpu()) { + put_cpu(); smp_call_function_single(channel->target_cpu, reset_channel_cb, channel, true); - else + } else { reset_channel_cb(channel); + put_cpu(); + } /* Send a closing message */ |
