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[134.134.139.74]) by smtp.gmail.com with ESMTPSA id s6sm786171pfd.157.2020.10.13.16.45.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Oct 2020 16:45:12 -0700 (PDT) From: Kuppuswamy Sathyanarayanan X-Google-Original-From: Kuppuswamy Sathyanarayanan To: bhelgaas@google.com, okaya@kernel.org Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: [PATCH v5 1/2] PCI/ERR: Call pci_bus_reset() before calling ->slot_reset() callback Date: Tue, 13 Oct 2020 16:45:01 -0700 Message-Id: <162495c76c391de6e021919e2b69c5cd2dbbc22a.1602632140.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Signed-off-by: Kuppuswamy Sathyanarayanan Reviewed-by: Sinan Kaya --- 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); -- 2.17.1