[PATCH 1/5] PCI: Support PCIe devices with short cfg_size
Tim Gardner
tim.gardner at canonical.com
Fri Sep 16 14:23:10 UTC 2016
From: "Jason S. McMullan" <jason.mcmullan at netronome.com>
BugLink: http://bugs.launchpad.net/bugs/1624267
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 <jason.mcmullan at netronome.com>
[simon: edited changelog]
Signed-off-by: Simon Horman <simon.horman at netronome.com>
[bhelgaas: more changelog edits]
Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
(cherry picked from commit c20aecf6963d1273d8f6d61c042b4845441ca592)
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
---
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 6a02775..1719769 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1354,10 +1354,10 @@ 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;
@@ -1414,10 +1414,10 @@ 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;
}
@@ -1451,10 +1451,10 @@ 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);
--
2.7.4
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