PCI: avoid save the same type of cap multiple times

Avoid adding the same type of cap multiple times, otherwise we will see dead loop.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 342857c555de..7248e9fb12bd 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -569,6 +569,7 @@ static int pci_save_pcie_state(struct pci_dev *dev)
         int pos, i = 0;
         struct pci_cap_saved_state *save_state;
         u16 *cap;
+        int found = 0;
 
         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
         if (pos <= 0)
@@ -577,6 +578,8 @@ static int pci_save_pcie_state(struct pci_dev *dev)
         save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
         if (!save_state)
                 save_state = kzalloc(sizeof(*save_state) + sizeof(u16) * 4, GFP_KERNEL);
+        else
+                found = 1;
         if (!save_state) {
                 dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
                 return -ENOMEM;
@@ -588,7 +591,8 @@ static int pci_save_pcie_state(struct pci_dev *dev)
         pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
         pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
         save_state->cap_nr = PCI_CAP_ID_EXP;
-        pci_add_saved_cap(dev, save_state);
+        if (!found)
+                pci_add_saved_cap(dev, save_state);
         return 0;
 }
 
@@ -616,6 +620,7 @@ static int pci_save_pcix_state(struct pci_dev *dev)
         int pos, i = 0;
         struct pci_cap_saved_state *save_state;
         u16 *cap;
+        int found = 0;
 
         pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
         if (pos <= 0)
@@ -624,6 +629,8 @@ static int pci_save_pcix_state(struct pci_dev *dev)
         save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
         if (!save_state)
                 save_state = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL);
+        else
+                found = 1;
         if (!save_state) {
                 dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
                 return -ENOMEM;
@@ -632,7 +639,8 @@ static int pci_save_pcix_state(struct pci_dev *dev)
 
         pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
         save_state->cap_nr = PCI_CAP_ID_PCIX;
-        pci_add_saved_cap(dev, save_state);
+        if (!found)
+                pci_add_saved_cap(dev, save_state);
         return 0;
 }