Messages in this thread | | | From | "Michael Kelley (EOSG)" <> | Subject | RE: [PATCH] Drivers: hv: vmbus: Reset the channel callback in vmbus_onoffer_rescind() | Date | Fri, 13 Jul 2018 13:59:53 +0000 |
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From: Dexuan Cui Sent: Thursday, July 12, 2018 10:53 PM > > Before setting channel->rescind in vmbus_rescind_cleanup(), we should make > sure the channel callback won't run any more, otherwise a high-level > driver like pci_hyperv, which may be infinitely waiting for the host VSP's > response and notices the channel has been rescinded, can't safely give > up: e.g., in hv_pci_protocol_negotiation() -> wait_for_response(), it's > unsafe to exit from wait_for_response() and proceed with the on-stack > variable "comp_pkt" popped. The issue was originally spotted by > Michael Kelley <mikelley@microsoft.com>. > > In vmbus_close_internal(), the patch also minimizes the range protected by > disabling/enabling channel->callback_event: we don't really need that for > the whole function. > > Signed-off-by: Dexuan Cui <decui@microsoft.com> > Cc: stable@vger.kernel.org > Cc: K. Y. Srinivasan <kys@microsoft.com> > Cc: Stephen Hemminger <sthemmin@microsoft.com> > Cc: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
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