From a8499f20d30e0f9632017fd27a8f1d8c146a6a33 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Thu, 8 Sep 2016 17:30:38 -0500 Subject: [PATCH] PCI: pciehp: Rename pcie_isr() locals for clarity Rename "detected" and "intr_loc" to "status" and "events" for clarity. "status" is the value we read from the Slot Status register; "events" is the set of hot-plug events we need to process. No functional change intended. Tested-by: Lukas Wunner Signed-off-by: Bjorn Helgaas Reviewed-by: Mika Westerberg --- drivers/pci/hotplug/pciehp_hpc.c | 46 +++++++++++++++++--------------- 1 file changed, 25 insertions(+), 21 deletions(-) diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 08e84d61874e..264df360444c 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -542,7 +542,7 @@ static irqreturn_t pcie_isr(int irq, void *dev_id) struct pci_bus *subordinate = pdev->subordinate; struct pci_dev *dev; struct slot *slot = ctrl->slot; - u16 detected, intr_loc; + u16 status, events; u8 present; bool link; @@ -555,31 +555,35 @@ static irqreturn_t pcie_isr(int irq, void *dev_id) * serviced, we need to re-inspect Slot Status register after * clearing what is presumed to be the last pending interrupt. */ - intr_loc = 0; + events = 0; do { - pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &detected); - if (detected == (u16) ~0) { + pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &status); + if (status == (u16) ~0) { ctrl_info(ctrl, "%s: no response from device\n", __func__); return IRQ_HANDLED; } - detected &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD | - PCI_EXP_SLTSTA_PDC | - PCI_EXP_SLTSTA_CC | PCI_EXP_SLTSTA_DLLSC); - detected &= ~intr_loc; - intr_loc |= detected; - if (!intr_loc) + /* + * Slot Status contains plain status bits as well as event + * notification bits; right now we only want the event bits. + */ + status &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD | + PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_CC | + PCI_EXP_SLTSTA_DLLSC); + status &= ~events; + events |= status; + if (!events) return IRQ_NONE; - if (detected) + if (status) pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, - intr_loc); - } while (detected); + events); + } while (status); - ctrl_dbg(ctrl, "pending interrupts %#06x from Slot Status\n", intr_loc); + ctrl_dbg(ctrl, "pending interrupts %#06x from Slot Status\n", events); /* Check Command Complete Interrupt Pending */ - if (intr_loc & PCI_EXP_SLTSTA_CC) { + if (events & PCI_EXP_SLTSTA_CC) { ctrl->cmd_busy = 0; smp_mb(); wake_up(&ctrl->queue); @@ -589,24 +593,24 @@ static irqreturn_t pcie_isr(int irq, void *dev_id) list_for_each_entry(dev, &subordinate->devices, bus_list) { if (dev->ignore_hotplug) { ctrl_dbg(ctrl, "ignoring hotplug event %#06x (%s requested no hotplug)\n", - intr_loc, pci_name(dev)); + events, pci_name(dev)); return IRQ_HANDLED; } } } - if (!(intr_loc & ~PCI_EXP_SLTSTA_CC)) + if (!(events & ~PCI_EXP_SLTSTA_CC)) return IRQ_HANDLED; /* Check Attention Button Pressed */ - if (intr_loc & PCI_EXP_SLTSTA_ABP) { + if (events & PCI_EXP_SLTSTA_ABP) { ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(slot)); pciehp_queue_interrupt_event(slot, INT_BUTTON_PRESS); } /* Check Presence Detect Changed */ - if (intr_loc & PCI_EXP_SLTSTA_PDC) { + if (events & PCI_EXP_SLTSTA_PDC) { pciehp_get_adapter_status(slot, &present); ctrl_info(ctrl, "Card %spresent on Slot(%s)\n", present ? "" : "not ", slot_name(slot)); @@ -615,13 +619,13 @@ static irqreturn_t pcie_isr(int irq, void *dev_id) } /* Check Power Fault Detected */ - if ((intr_loc & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) { + if ((events & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) { ctrl->power_fault_detected = 1; ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(slot)); pciehp_queue_interrupt_event(slot, INT_POWER_FAULT); } - if (intr_loc & PCI_EXP_SLTSTA_DLLSC) { + if (events & PCI_EXP_SLTSTA_DLLSC) { link = pciehp_check_link_active(ctrl); ctrl_info(ctrl, "slot(%s): Link %s event\n", slot_name(slot), link ? "Up" : "Down"); -- 2.39.5