[Xen-devel] [PATCH 1/2] xen-pciback: Fix error return in bar_write() and rom_write()

[Marek Marczykowski-Górecki]

From: Dwayne Litzenberger <dl...@dlitz.net>

Signed-off-by: Dwayne Litzenberger <dl...@dlitz.net>
---
 drivers/xen/xen-pciback/conf_space_header.c | 24 ++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/xen/xen-pciback/conf_space_header.c 
b/drivers/xen/xen-pciback/conf_space_header.c
index 10ae24b..697d0a8 100644
--- a/drivers/xen/xen-pciback/conf_space_header.c
+++ b/drivers/xen/xen-pciback/conf_space_header.c
@@ -135,6 +135,7 @@ static int command_write(struct pci_dev *dev, int offset, 
u16 value, void *data)
 
 static int rom_write(struct pci_dev *dev, int offset, u32 value, void *data)
 {
+       int err = 0;
        struct pci_bar_info *bar = data;
 
        if (unlikely(!bar)) {
@@ -150,17 +151,22 @@ static int rom_write(struct pci_dev *dev, int offset, u32 
value, void *data)
                bar->which = 1;
        else {
                u32 tmpval;
-               pci_read_config_dword(dev, offset, &tmpval);
+               err = pci_read_config_dword(dev, offset, &tmpval);
+               if (err)
+                       goto out;
                if (tmpval != bar->val && value == bar->val) {
                        /* Allow restoration of bar value. */
-                       pci_write_config_dword(dev, offset, bar->val);
+                       err = pci_write_config_dword(dev, offset, bar->val);
+                       if (err)
+                               goto out;
                }
                bar->which = 0;
        }
 
        /* Do we need to support enabling/disabling the rom address here? */
 
-       return 0;
+out:
+       return err;
 }
 
 /* For the BARs, only allow writes which write ~0 or
@@ -169,6 +175,7 @@ static int rom_write(struct pci_dev *dev, int offset, u32 
value, void *data)
  */
 static int bar_write(struct pci_dev *dev, int offset, u32 value, void *data)
 {
+       int err = 0;
        struct pci_bar_info *bar = data;
        unsigned int pos = (offset - PCI_BASE_ADDRESS_0) / 4;
        const struct resource *res = dev->resource;
@@ -193,15 +200,20 @@ static int bar_write(struct pci_dev *dev, int offset, u32 
value, void *data)
                bar->which = 1;
        else {
                u32 tmpval;
-               pci_read_config_dword(dev, offset, &tmpval);
+               err = pci_read_config_dword(dev, offset, &tmpval);
+               if (err)
+                       goto out;
                if (tmpval != bar->val && value == bar->val) {
                        /* Allow restoration of bar value. */
-                       pci_write_config_dword(dev, offset, bar->val);
+                       err = pci_write_config_dword(dev, offset, bar->val);
+                       if (err)
+                               goto out;
                }
                bar->which = 0;
        }
 
-       return 0;
+out:
+       return err;
 }
 
 static int bar_read(struct pci_dev *dev, int offset, u32 * value, void *data)
-- 
git-series 0.9.1

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