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Message-Id: <1335539820-11232-7-git-send-email-jiang.liu@huawei.com>
Date: Fri, 27 Apr 2012 23:16:47 +0800
From: Jiang Liu <liuj97@...il.com>
To: Yinghai Lu <yinghai@...nel.org>,
Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Don Dutile <ddutile@...hat.com>,
Greg KH <gregkh@...uxfoundation.org>
Cc: Jiang Liu <jiang.liu@...wei.com>,
Keping Chen <chenkeping@...wei.com>,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
Jiang Liu <liuj97@...il.com>
Subject: [PATCH v2 06/19] PCI: prepare for serializing hotplug operations triggered by pciehp driver
From: Jiang Liu <jiang.liu@...wei.com>
Split pciehp_wq into two workqueues to avoid possible deadlock issues
when using PCI hotplug lock to serialize hotplug operations triggered
by pciehp driver.
Signed-off-by: Jiang Liu <liuj97@...il.com>
---
drivers/pci/hotplug/pciehp.h | 3 ++-
drivers/pci/hotplug/pciehp_core.c | 18 +++++++++++++-----
drivers/pci/hotplug/pciehp_ctrl.c | 8 ++++----
drivers/pci/hotplug/pciehp_hpc.c | 11 ++++++-----
4 files changed, 25 insertions(+), 15 deletions(-)
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index 4b7cce1..c8a1a27 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -44,7 +44,8 @@ extern bool pciehp_poll_mode;
extern int pciehp_poll_time;
extern bool pciehp_debug;
extern bool pciehp_force;
-extern struct workqueue_struct *pciehp_wq;
+extern struct workqueue_struct *pciehp_wq_event;
+extern struct workqueue_struct *pciehp_wq_power;
#define dbg(format, arg...) \
do { \
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 365c6b9..4ceefe3 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -42,7 +42,8 @@ bool pciehp_debug;
bool pciehp_poll_mode;
int pciehp_poll_time;
bool pciehp_force;
-struct workqueue_struct *pciehp_wq;
+struct workqueue_struct *pciehp_wq_event;
+struct workqueue_struct *pciehp_wq_power;
#define DRIVER_VERSION "0.4"
#define DRIVER_AUTHOR "Dan Zink <dan.zink@...paq.com>, Greg Kroah-Hartman <greg@...ah.com>, Dely Sy <dely.l.sy@...el.com>"
@@ -340,16 +341,22 @@ static int __init pcied_init(void)
{
int retval = 0;
- pciehp_wq = alloc_workqueue("pciehp", 0, 0);
- if (!pciehp_wq)
+ pciehp_wq_event = alloc_workqueue("pciehp_event", 0, 0);
+ if (!pciehp_wq_event)
return -ENOMEM;
+ pciehp_wq_power = alloc_workqueue("pciehp_power", 0, 0);
+ if (!pciehp_wq_power) {
+ destroy_workqueue(pciehp_wq_event);
+ return -ENOMEM;
+ }
pciehp_firmware_init();
retval = pcie_port_service_register(&hpdriver_portdrv);
dbg("pcie_port_service_register = %d\n", retval);
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
if (retval) {
- destroy_workqueue(pciehp_wq);
+ destroy_workqueue(pciehp_wq_event);
+ destroy_workqueue(pciehp_wq_power);
dbg("Failure to register service\n");
}
return retval;
@@ -359,7 +366,8 @@ static void __exit pcied_cleanup(void)
{
dbg("unload_pciehpd()\n");
pcie_port_service_unregister(&hpdriver_portdrv);
- destroy_workqueue(pciehp_wq);
+ destroy_workqueue(pciehp_wq_event);
+ destroy_workqueue(pciehp_wq_power);
info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
}
diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 27f4429..8f4d261 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -49,7 +49,7 @@ static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
info->p_slot = p_slot;
INIT_WORK(&info->work, interrupt_event_handler);
- queue_work(pciehp_wq, &info->work);
+ queue_work(pciehp_wq_event, &info->work);
return 0;
}
@@ -344,7 +344,7 @@ void pciehp_queue_pushbutton_work(struct work_struct *work)
kfree(info);
goto out;
}
- queue_work(pciehp_wq, &info->work);
+ queue_work(pciehp_wq_power, &info->work);
out:
mutex_unlock(&p_slot->lock);
}
@@ -377,7 +377,7 @@ static void handle_button_press_event(struct slot *p_slot)
if (ATTN_LED(ctrl))
pciehp_set_attention_status(p_slot, 0);
- queue_delayed_work(pciehp_wq, &p_slot->work, 5*HZ);
+ queue_delayed_work(pciehp_wq_event, &p_slot->work, 5*HZ);
break;
case BLINKINGOFF_STATE:
case BLINKINGON_STATE:
@@ -439,7 +439,7 @@ static void handle_surprise_event(struct slot *p_slot)
else
p_slot->state = POWERON_STATE;
- queue_work(pciehp_wq, &info->work);
+ queue_work(pciehp_wq_power, &info->work);
}
static void interrupt_event_handler(struct work_struct *work)
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 98b775f..d5c826d 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -894,14 +894,15 @@ static void pcie_cleanup_slot(struct controller *ctrl)
* Following workqueue flushing logic is to deal with the special
* call path:
* 1) pcie_isr() -> pciehp_handle_xxx() ->
- * queue_interrupt_event(pciehp_wq_event)->queue_work(pciehp_wq)
+ * queue_interrupt_event(pciehp_wq_event)->
+ * queue_work(pciehp_wq_event)
* 2) interrupt_event_handler() -> handle_button_press_event() ->
- * queue_delayed_work(pciehp_wq)
- * 3) pciehp_queue_pushbutton_work() -> queue_work(pciehp_wq)
+ * queue_delayed_work(pciehp_wq_event)
+ * 3) pciehp_queue_pushbutton_work() -> queue_work(pciehp_wq_power)
*/
- flush_workqueue(pciehp_wq);
+ flush_workqueue(pciehp_wq_event);
cancel_delayed_work_sync(&slot->work);
- flush_workqueue(pciehp_wq);
+ flush_workqueue(pciehp_wq_power);
kfree(slot);
}
--
1.7.5.4
--
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