From ab2b9d85ce2d2a9b8eb6dff5c1b6c747b2ef3ddf Mon Sep 17 00:00:00 2001
From: "Jason S. McMullan" <jason.mcmullan@netronome.com>
Date: Wed, 30 Sep 2015 15:35:05 +0900
Subject: [PATCH] PCI: Support PCIe devices with short cfg_size

[ Upstream commit c20aecf6963d1273d8f6d61c042b4845441ca592 ]

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@netronome.com>
[simon: edited changelog]
Signed-off-by: Simon Horman <simon.horman@netronome.com>
[bhelgaas: more changelog edits]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Signed-off-by: Sasha Levin <alexander.levin@verizon.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 eb1543841e39..795d800deef2 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1363,10 +1363,10 @@ 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;
 
@@ -1418,10 +1418,10 @@ int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
 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;
 }
@@ -1455,10 +1455,10 @@ 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);
 
-- 
2.30.9