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>
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 342857c..7248e9f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -569,6 +569,7 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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;
}