Patch "PCI: Support PCIe devices with short cfg_size" has been added to the 3.14-stable tree

This is a note to let you know that I've just added the patch titled

PCI: Support PCIe devices with short cfg_size

to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
pci-support-pcie-devices-with-short-cfg_size.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: "Jason S. McMullan" <[email protected]>
Date: Wed, 30 Sep 2015 15:35:05 +0900
Subject: PCI: Support PCIe devices with short cfg_size

From: Jason S. McMullan <[email protected]>

commit c20aecf6963d1273d8f6d61c042b4845441ca592 upstream.

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).

---
 drivers/pci/pci-sysfs.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

@@ -1349,10 +1349,10 @@ int __must_check pci_create_sysfs_dev_fi
 	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;
 

@@ -1409,10 +1409,10 @@ 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;
 }

@@ -1446,10 +1446,10 @@ void pci_remove_sysfs_dev_files(struct p
 
 	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);
 

Patches currently in stable-queue which might be from [email protected] are

queue-3.14/pci-limit-config-space-size-for-netronome-nfp6000-family.patch queue-3.14/pci-support-pcie-devices-with-short-cfg_size.patch queue-3.14/pci-add-netronome-vendor-and-device-ids.patch