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H A D | eeh-powernv.c | 98fd32cd Tue Sep 03 05:15:58 CDT 2019 Oliver O'Halloran <oohall@gmail.com> powernv/eeh: Use generic code to handle hot resets
When we reset PCI devices managed by a hotplug driver the reset may generate spurious hotplug events that cause the PCI device we're resetting to be torn down accidently. This is a problem for EEH (when the driver is EEH aware) since we want to leave the OS PCI device state intact so that the device can be re-set without losing any resources (network, disks, etc) provided by the driver.
Generic PCI code provides the pci_bus_error_reset() function to handle resetting a PCI Device (or bus) by using the reset method provided by the hotplug slot driver. We can use this function if the EEH core has requested a hot reset (common case) without tripping over the hotplug driver.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190903101605.2890-8-oohall@gmail.com 98fd32cd Tue Sep 03 05:15:58 CDT 2019 Oliver O'Halloran <oohall@gmail.com> powernv/eeh: Use generic code to handle hot resets When we reset PCI devices managed by a hotplug driver the reset may generate spurious hotplug events that cause the PCI device we're resetting to be torn down accidently. This is a problem for EEH (when the driver is EEH aware) since we want to leave the OS PCI device state intact so that the device can be re-set without losing any resources (network, disks, etc) provided by the driver. Generic PCI code provides the pci_bus_error_reset() function to handle resetting a PCI Device (or bus) by using the reset method provided by the hotplug slot driver. We can use this function if the EEH core has requested a hot reset (common case) without tripping over the hotplug driver. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190903101605.2890-8-oohall@gmail.com
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