From shaohua.li@intel.com Mon Dec 17 17:57:46 2007 From: Shaohua Li Date: Tue, 18 Dec 2007 09:57:09 +0800 Subject: PCI: avoid save the same type of cap multiple times Cc: Andrew Morton , Greg KH Message-ID: <1197943029.17023.18.camel@sli10-desk.sh.intel.com> Avoid adding the same type of cap multiple times, otherwise we will see dead loop. Signed-off-by: Shaohua Li Signed-off-by: Greg Kroah-Hartman --- drivers/pci/pci.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -569,6 +569,7 @@ static int pci_save_pcie_state(struct pc 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 pc 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 pc 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 pc 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 pc 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 pc 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; }