From 93de6901766c6821538b74a092e47780a9120fac Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Thu, 3 Dec 2015 13:18:18 -0600 Subject: [PATCH] PCI: Check for PCI_HEADER_TYPE_BRIDGE equality, not bitmask Bit 7 of the "Header Type" register indicates a multi-function device when set. Bits 0-6 contain encoded values, where 0x1 indicates a PCI-PCI bridge. It is incorrect to test this as though it were a mask. For example, while the PCI 3.0 spec only defines values 0x0, 0x1, and 0x2, it's conceivable that a future spec could define 0x3 to mean something else; then tests for "(hdr_type & 0x7f) & PCI_HEADER_TYPE_BRIDGE" would incorrectly succeed for this new 0x3 header type. Test bits 0-6 of the Header Type for equality with PCI_HEADER_TYPE_BRIDGE. Signed-off-by: Bjorn Helgaas --- arch/powerpc/kernel/eeh_driver.c | 2 +- drivers/pci/hotplug/ibmphp_pci.c | 2 +- drivers/pci/pcie/aer/aerdrv_core.c | 10 +++++----- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c index 80dfe89..44bca78 100644 --- a/arch/powerpc/kernel/eeh_driver.c +++ b/arch/powerpc/kernel/eeh_driver.c @@ -400,7 +400,7 @@ static void *eeh_rmv_device(void *data, void *userdata) * support EEH. So we just care about PCI devices for * simplicity here. */ - if (!dev || (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) + if (!dev || (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) return NULL; /* diff --git a/drivers/pci/hotplug/ibmphp_pci.c b/drivers/pci/hotplug/ibmphp_pci.c index 814cea2..5824df5 100644 --- a/drivers/pci/hotplug/ibmphp_pci.c +++ b/drivers/pci/hotplug/ibmphp_pci.c @@ -1119,7 +1119,7 @@ static struct res_needed *scan_behind_bridge (struct pci_func *func, u8 busno) pci_bus_read_config_dword (ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class); debug ("hdr_type behind the bridge is %x\n", hdr_type); - if (hdr_type & PCI_HEADER_TYPE_BRIDGE) { + if ((hdr_type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) { err ("embedded bridges not supported for hot-plugging.\n"); amount->not_correct = 1; return amount; diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c index fba785e..7123925 100644 --- a/drivers/pci/pcie/aer/aerdrv_core.c +++ b/drivers/pci/pcie/aer/aerdrv_core.c @@ -246,7 +246,7 @@ static int report_error_detected(struct pci_dev *dev, void *data) !dev->driver->err_handler || !dev->driver->err_handler->error_detected) { if (result_data->state == pci_channel_io_frozen && - !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) { + dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { /* * In case of fatal recovery, if one of down- * stream device has no driver. We might be @@ -269,7 +269,7 @@ static int report_error_detected(struct pci_dev *dev, void *data) * without recovery. */ - if (!(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) + if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) vote = PCI_ERS_RESULT_NO_AER_DRIVER; else vote = PCI_ERS_RESULT_NONE; @@ -369,7 +369,7 @@ static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, else result_data.result = PCI_ERS_RESULT_RECOVERED; - if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) { + if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { /* * If the error is reported by a bridge, we think this error * is related to the downstream link of the bridge, so we @@ -440,7 +440,7 @@ static pci_ers_result_t reset_link(struct pci_dev *dev) pci_ers_result_t status; struct pcie_port_service_driver *driver; - if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) { + if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { /* Reset this port for all subordinates */ udev = dev; } else { @@ -660,7 +660,7 @@ static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info) &info->mask); if (!(info->status & ~info->mask)) return 0; - } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE || + } else if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || info->severity == AER_NONFATAL) { /* Link is still healthy for IO reads */ -- 2.7.4