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82c454a794
Regenerate the kernel patches from https://github.com/rneugeba/linux-stable/ Note, the last two 4.9 patches are no properly cherry-picked from linux-next. We previously had 0011-Drivers-hv-vmbus-Use-all... from an email. 0012-Drivers-hv-Log-the... is new, but may further aid debugging version mismatch issues. Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
43 lines
1.5 KiB
Diff
43 lines
1.5 KiB
Diff
From 67ed51a12d61aeb16148d1e524fc6a530edb057b Mon Sep 17 00:00:00 2001
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From: Dexuan Cui <decui@microsoft.com>
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Date: Mon, 14 Dec 2015 16:01:48 -0800
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Subject: [PATCH 19/44] Drivers: hv: vmbus: do sanity check of channel state in
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vmbus_close_internal()
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This fixes an incorrect assumption of channel state in the function.
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Signed-off-by: Dexuan Cui <decui@microsoft.com>
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Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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(cherry picked from commit 64b7faf903dae2df94d89edf2c688b16751800e4)
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---
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drivers/hv/channel.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
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index 1ef37c727572..2889d97c03b1 100644
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--- a/drivers/hv/channel.c
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+++ b/drivers/hv/channel.c
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@@ -512,6 +512,18 @@ static int vmbus_close_internal(struct vmbus_channel *channel)
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tasklet = hv_context.event_dpc[channel->target_cpu];
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tasklet_disable(tasklet);
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+ /*
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+ * In case a device driver's probe() fails (e.g.,
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+ * util_probe() -> vmbus_open() returns -ENOMEM) and the device is
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+ * rescinded later (e.g., we dynamically disble an Integrated Service
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+ * in Hyper-V Manager), the driver's remove() invokes vmbus_close():
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+ * here we should skip most of the below cleanup work.
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+ */
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+ if (channel->state != CHANNEL_OPENED_STATE) {
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+ ret = -EINVAL;
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+ goto out;
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+ }
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+
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channel->state = CHANNEL_OPEN_STATE;
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channel->sc_creation_callback = NULL;
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/* Stop callback and cancel the timer asap */
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--
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2.11.0
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