From c20aecf6963d1273d8f6d61c042b4845441ca592 Mon Sep 17 00:00:00 2001 From: "Jason S. McMullan" Date: Wed, 30 Sep 2015 15:35:05 +0900 Subject: [PATCH] PCI: Support PCIe devices with short cfg_size If a device quirk modifies the pci_dev->cfg_size to be less than PCI_CFG_SPACE_EXP_SIZE (4096), but greater than PCI_CFG_SPACE_SIZE (256), the PCI sysfs interface truncates the readable size to PCI_CFG_SPACE_SIZE. Allow sysfs access to config space up to cfg_size, even if the device doesn't support the entire 4096-byte PCIe config space. Note that pci_read_config() and pci_write_config() limit access to dev->cfg_size even though pcie_config_attr contains 4096 (the maximum size). Signed-off-by: Jason S. McMullan [simon: edited changelog] Signed-off-by: Simon Horman [bhelgaas: more changelog edits] Signed-off-by: Bjorn Helgaas --- drivers/pci/pci-sysfs.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 92618686604c..9cd27b703dd6 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1369,10 +1369,10 @@ int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev) if (!sysfs_initialized) return -EACCES; - if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) - retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); - else + if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); + else + retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); if (retval) goto err; @@ -1424,10 +1424,10 @@ err_rom_file: err_resource_files: pci_remove_resource_files(pdev); err_config_file: - if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) - sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); - else + if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); + else + sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); err: return retval; } @@ -1461,10 +1461,10 @@ void pci_remove_sysfs_dev_files(struct pci_dev *pdev) pci_remove_capabilities_sysfs(pdev); - if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) - sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); - else + if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); + else + sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); pci_remove_resource_files(pdev);