Fix possible endless loop in pcie_isr. Current pcie_isr function (interrupt service routine of pciehp) has a possibility to get into endless loop in the case that bits in Slot Status register is set again immediately after cleared. According to the past discussion (see below URL) in the following pcihpd-discuss ML, this case can happen power fault detected bit. http://sourceforge.net/mailarchive/message.php?msg_id=20051130135409.A14918%40unix-os.sc.intel.com Signed-off-by: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx> --- drivers/pci/hotplug/pciehp_hpc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: 20090130/drivers/pci/hotplug/pciehp_hpc.c =================================================================== --- 20090130.orig/drivers/pci/hotplug/pciehp_hpc.c +++ 20090130/drivers/pci/hotplug/pciehp_hpc.c @@ -672,10 +672,11 @@ static irqreturn_t pcie_isr(int irq, voi detected &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD | PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_CC); + detected &= ~intr_loc; intr_loc |= detected; if (!intr_loc) return IRQ_NONE; - if (detected && pciehp_writew(ctrl, PCI_EXP_SLTSTA, detected)) { + if (detected && pciehp_writew(ctrl, PCI_EXP_SLTSTA, intr_loc)) { ctrl_err(ctrl, "%s: Cannot write to SLOTSTATUS\n", __func__); return IRQ_NONE; -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
