From: Wei Hu <w...@microsoft.com> Sent: Friday, July 17, 2020 8:48 PM
> To: KY Srinivasan <k...@microsoft.com>; Haiyang Zhang
> <haiya...@microsoft.com>;
> Stephen Hemminger <sthem...@microsoft.com>; wei....@kernel.org;
> lorenzo.pieral...@arm.com; r...@kernel.org; bhelg...@google.com; linux-
> hyp...@vger.kernel.org; linux-...@vger.kernel.org;
> linux-kernel@vger.kernel.org; Dexuan
> Cui <de...@microsoft.com>; Michael Kelley <mikel...@microsoft.com>
> Cc: Wei Hu <w...@microsoft.com>
> Subject: [PATCH v3] PCI: hv: Fix a timing issue which causes kdump to fail
> occasionally
>
> Kdump could fail sometime on Hyper-V guest over Accelerated Network
> interface. This is because the retry in hv_pci_enter_d0() relies on
> an asynchronous host event arriving before the guest calls
> hv_send_resources_allocated(). Fix the problem by moving retry
> to hv_pci_probe(), removing this dependency and making the calling
> sequence synchronous.
>
> Fixes: c81992e7f4aa ("PCI: hv: Retry PCI bus D0 entry on invalid device
> state")
> Signed-off-by: Wei Hu <w...@microsoft.com>
> ---
> v2: Adding Fixes tag according to Michael Kelley's review comment.
> v3: Fix couple typos and reword commit message to make it clearer.
> Thanks the comments from Bjorn Helgaas.
>
> drivers/pci/controller/pci-hyperv.c | 66 ++++++++++++++---------------
> 1 file changed, 32 insertions(+), 34 deletions(-)
>
I gave my Reviewed-by on the earlier v1 of this patch, but reiterating it
here:
Reviewed-by: Michael Kelley <mikel...@microsoft.com>
