linux-kernel - Re: [PATCH] Revert "PCI: Mark LSI FW643 to avoid bus reset"

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Date: Fri, 29 Mar 2024 17:04:00 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: linux-pci@...r.kernel.org, Edmund Raile <edmund.raile@...ton.me>,
	Alex Williamson <alex.williamson@...hat.com>,
	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux1394-devel@...ts.sourceforge.net
Subject: Re: [PATCH] Revert "PCI: Mark LSI FW643 to avoid bus reset"

On Thu, Mar 28, 2024 at 04:23:02PM -0500, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> This reverts commit 29a43dc130ce65d365a8ea9e1cc4bc51005a353e.
> 
> 29a43dc130ce ("PCI: Mark LSI FW643 to avoid bus reset") by Edmund was based
> on the assumption that the LSI / Agere FW643 has a defect such that it
> can't recover after a Secondary Bus Reset (SBR).
> 
> But Takashi Sakamoto reported that SBR works fine on this same FW643 device
> in an AMD Ryzen 5 2400G system, so apparently there is some other aspect of
> Edmund's system that accounts for the issue.
> 
> The down side of 29a43dc130ce is that when the FW643 is assigned to a VM,
> avoiding the SBR means we leak data out of the VM.
> 
> Revert 29a43dc130ce until we figure out a better solution.  In the
> meantime, we can use the sysfs "reset_method" interface to restrict the
> available reset methods.
> 
> Fixes: 29a43dc130ce ("PCI: Mark LSI FW643 to avoid bus reset")
> Reported-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
> Link: https://lore.kernel.org/r/20240325012135.36861-1-o-takashi@sakamocchi.jp
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  drivers/pci/quirks.c | 8 --------
>  1 file changed, 8 deletions(-)

Reviewed-by: Takashi Sakamoto <o-takashi@...amocchi.jp>

Thank you for the revert patch, and I apologize for the delay in catching
up with the change. Please feel free to add me or the linux1394-devel list
to CC of these kind of changes.


Thanks

Takashi Sakamoto