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This reverts commit29a43dc130.29a43dc130("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 of29a43dc130is that when the FW643 is assigned to a VM, avoiding the SBR means we leak data out of the VM. Revert29a43dc130until we figure out a better solution. In the meantime, we can use the sysfs "reset_method" interface to restrict the available reset methods. Link: https://lore.kernel.org/r/20240328212302.1582483-1-helgaas@kernel.org Fixes:29a43dc130("PCI: Mark LSI FW643 to avoid bus reset") Reported-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20240325012135.36861-1-o-takashi@sakamocchi.jp Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>