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SubjectRe: [PATCH v8 1/2] PCI/ERR: Call pci_bus_reset() before calling ->slot_reset() callback
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Hi Bjorn,

On 10/26/20 12:37 PM, Kuppuswamy Sathyanarayanan wrote:
> Currently if report_error_detected() or report_mmio_enabled()
> functions requests PCI_ERS_RESULT_NEED_RESET, current
> pcie_do_recovery() implementation does not do the requested
> explicit device reset, but instead just calls the
> report_slot_reset() on all affected devices. Notifying about the
> reset via report_slot_reset() without doing the actual device
> reset is incorrect. So call pci_bus_reset() before triggering
> ->slot_reset() callback.
Any comments on this series?
>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> Reviewed-by: Sinan Kaya <okaya@kernel.org>
> Reviewed-by: Ashok Raj <ashok.raj@intel.com>
> ---
> Changes since v7:
> * Rebased on top of v5.10-rc1.
>
> Changes since v6:
> * None.
>
> Changes since v5:
> * Added Ashok's Reviewed-by tag.
>
> Changes since v4:
> * Added check for pci_reset_bus() return value.
>
> drivers/pci/pcie/err.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
> index c543f419d8f9..315a4d559c4c 100644
> --- a/drivers/pci/pcie/err.c
> +++ b/drivers/pci/pcie/err.c
> @@ -152,6 +152,7 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
> {
> pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
> struct pci_bus *bus;
> + int ret;
>
> /*
> * Error recovery runs on all subordinates of the first downstream port.
> @@ -181,11 +182,12 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
> }
>
> if (status == PCI_ERS_RESULT_NEED_RESET) {
> - /*
> - * TODO: Should call platform-specific
> - * functions to reset slot before calling
> - * drivers' slot_reset callbacks?
> - */
> + ret = pci_reset_bus(dev);
> + if (ret < 0) {
> + pci_err(dev, "Failed to reset %d\n", ret);
> + status = PCI_ERS_RESULT_DISCONNECT;
> + goto failed;
> + }
> status = PCI_ERS_RESULT_RECOVERED;
> pci_dbg(dev, "broadcast slot_reset message\n");
> pci_walk_bus(bus, report_slot_reset, &status);
>

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer

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