From ecdde93962eacd9c417977a4eabd318dbb612c11 Mon Sep 17 00:00:00 2001 From: Mark Lord Date: Wed, 21 Nov 2007 15:07:55 -0800 Subject: [PATCH] PCIe: fix double initialization bug Earlier patches to split out the hardware init for PCIe hotplug resulted in some one-time initializations being redone on every resume cycle. Eg. irq/polling initialization. This patch splits the hardware init into two parts, and separates the one-time initializations from those so that they only ever get done once, as intended. Signed-off-by: Mark Lord Signed-off-by: Andrew Morton Signed-off-by: Kristen Carlson Accardi Signed-off-by: Greg Kroah-Hartman --- drivers/pci/hotplug/pciehp.h | 2 +- drivers/pci/hotplug/pciehp_core.c | 2 +- drivers/pci/hotplug/pciehp_hpc.c | 119 +++++++++++++++++------------- 3 files changed, 69 insertions(+), 54 deletions(-) diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h index e4ad00a344..288fc46891 100644 --- a/drivers/pci/hotplug/pciehp.h +++ b/drivers/pci/hotplug/pciehp.h @@ -163,7 +163,7 @@ extern void pciehp_queue_pushbutton_work(struct work_struct *work); int pcie_init(struct controller *ctrl, struct pcie_device *dev); int pciehp_enable_slot(struct slot *p_slot); int pciehp_disable_slot(struct slot *p_slot); -int pcie_init_hardware(struct controller *ctrl, struct pcie_device *dev); +int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev); static inline struct slot *pciehp_find_slot(struct controller *ctrl, u8 device) { diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c index ae3fe318b8..310223d037 100644 --- a/drivers/pci/hotplug/pciehp_core.c +++ b/drivers/pci/hotplug/pciehp_core.c @@ -521,7 +521,7 @@ static int pciehp_resume (struct pcie_device *dev) u8 status; /* reinitialize the chipset's event detection logic */ - pcie_init_hardware(ctrl, dev); + pcie_init_hardware_part2(ctrl, dev); t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset); diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 8b11d80bf6..8c2d6c9b92 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -1067,28 +1067,25 @@ int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev) } #endif -int pcie_init_hardware(struct controller *ctrl, struct pcie_device *dev) +static int pcie_init_hardware_part1(struct controller *ctrl, + struct pcie_device *dev) { int rc; u16 temp_word; - u16 intr_enable = 0; u32 slot_cap; u16 slot_status; - struct pci_dev *pdev; - - pdev = dev->port; rc = pciehp_readl(ctrl, SLOTCAP, &slot_cap); if (rc) { err("%s: Cannot read SLOTCAP register\n", __FUNCTION__); - goto abort_free_ctlr; + return -1; } /* Mask Hot-plug Interrupt Enable */ rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word); if (rc) { err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__); - goto abort_free_ctlr; + return -1; } dbg("%s: SLOTCTRL %x value read %x\n", @@ -1099,62 +1096,46 @@ int pcie_init_hardware(struct controller *ctrl, struct pcie_device *dev) rc = pciehp_writew(ctrl, SLOTCTRL, temp_word); if (rc) { err("%s: Cannot write to SLOTCTRL register\n", __FUNCTION__); - goto abort_free_ctlr; + return -1; } rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status); if (rc) { err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__); - goto abort_free_ctlr; + return -1; } temp_word = 0x1F; /* Clear all events */ rc = pciehp_writew(ctrl, SLOTSTATUS, temp_word); if (rc) { err("%s: Cannot write to SLOTSTATUS register\n", __FUNCTION__); - goto abort_free_ctlr; - } - - if (pciehp_poll_mode) { - /* Install interrupt polling timer. Start with 10 sec delay */ - init_timer(&ctrl->poll_timer); - start_int_poll_timer(ctrl, 10); - } else { - /* Installs the interrupt handler */ - rc = request_irq(ctrl->pci_dev->irq, pcie_isr, IRQF_SHARED, - MY_NAME, (void *)ctrl); - dbg("%s: request_irq %d for hpc%d (returns %d)\n", - __FUNCTION__, ctrl->pci_dev->irq, - atomic_read(&pciehp_num_controllers), rc); - if (rc) { - err("Can't get irq %d for the hotplug controller\n", - ctrl->pci_dev->irq); - goto abort_free_ctlr; - } + return -1; } - dbg("pciehp ctrl b:d:f:irq=0x%x:%x:%x:%x\n", pdev->bus->number, - PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), dev->irq); + return 0; +} - /* - * If this is the first controller to be initialized, - * initialize the pciehp work queue - */ - if (atomic_add_return(1, &pciehp_num_controllers) == 1) { - pciehp_wq = create_singlethread_workqueue("pciehpd"); - if (!pciehp_wq) { - rc = -ENOMEM; - goto abort_free_irq; - } - } +int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev) +{ + int rc; + u16 temp_word; + u16 intr_enable = 0; + u32 slot_cap; + u16 slot_status; rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word); if (rc) { err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__); - goto abort_free_irq; + goto abort; } intr_enable = intr_enable | PRSN_DETECT_ENABLE; + rc = pciehp_readl(ctrl, SLOTCAP, &slot_cap); + if (rc) { + err("%s: Cannot read SLOTCAP register\n", __FUNCTION__); + goto abort; + } + if (ATTN_BUTTN(slot_cap)) intr_enable = intr_enable | ATTN_BUTTN_ENABLE; @@ -1179,7 +1160,7 @@ int pcie_init_hardware(struct controller *ctrl, struct pcie_device *dev) rc = pciehp_writew(ctrl, SLOTCTRL, temp_word); if (rc) { err("%s: Cannot write to SLOTCTRL register\n", __FUNCTION__); - goto abort_free_irq; + goto abort; } rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status); if (rc) { @@ -1214,14 +1195,7 @@ abort_disable_intr: } if (rc) err("%s : disabling interrupts failed\n", __FUNCTION__); - -abort_free_irq: - if (pciehp_poll_mode) - del_timer_sync(&ctrl->poll_timer); - else - free_irq(ctrl->pci_dev->irq, ctrl); - -abort_free_ctlr: +abort: return -1; } @@ -1318,11 +1292,52 @@ int pcie_init(struct controller *ctrl, struct pcie_device *dev) ctrl->first_slot = slot_cap >> 19; ctrl->ctrlcap = slot_cap & 0x0000007f; - rc = pcie_init_hardware(ctrl, dev); + rc = pcie_init_hardware_part1(ctrl, dev); + if (rc) + goto abort; + + if (pciehp_poll_mode) { + /* Install interrupt polling timer. Start with 10 sec delay */ + init_timer(&ctrl->poll_timer); + start_int_poll_timer(ctrl, 10); + } else { + /* Installs the interrupt handler */ + rc = request_irq(ctrl->pci_dev->irq, pcie_isr, IRQF_SHARED, + MY_NAME, (void *)ctrl); + dbg("%s: request_irq %d for hpc%d (returns %d)\n", + __FUNCTION__, ctrl->pci_dev->irq, + atomic_read(&pciehp_num_controllers), rc); + if (rc) { + err("Can't get irq %d for the hotplug controller\n", + ctrl->pci_dev->irq); + goto abort; + } + } + dbg("pciehp ctrl b:d:f:irq=0x%x:%x:%x:%x\n", pdev->bus->number, + PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), dev->irq); + + /* + * If this is the first controller to be initialized, + * initialize the pciehp work queue + */ + if (atomic_add_return(1, &pciehp_num_controllers) == 1) { + pciehp_wq = create_singlethread_workqueue("pciehpd"); + if (!pciehp_wq) { + rc = -ENOMEM; + goto abort_free_irq; + } + } + + rc = pcie_init_hardware_part2(ctrl, dev); if (rc == 0) { ctrl->hpc_ops = &pciehp_hpc_ops; return 0; } +abort_free_irq: + if (pciehp_poll_mode) + del_timer_sync(&ctrl->poll_timer); + else + free_irq(ctrl->pci_dev->irq, ctrl); abort: return -1; } -- 2.39.5