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authorRajat Jain <rajatxjain@gmail.com>2014-02-04 18:31:11 -0800
committerBjorn Helgaas <bhelgaas@google.com>2014-02-11 16:13:16 -0700
commit50b52fdee050745935d92e7026373edea2647e60 (patch)
tree0739f5a0135b070c7626542ffd593074341d950b /drivers/pci
parentc4f2f5e4981073a5aa0739f93b6733060cd37648 (diff)
downloadop-kernel-dev-50b52fdee050745935d92e7026373edea2647e60.zip
op-kernel-dev-50b52fdee050745935d92e7026373edea2647e60.tar.gz
PCI: pciehp: Add hotplug_lock to serialize hotplug events
Today it is there is no protection around pciehp_enable_slot() and pciehp_disable_slot() to ensure that they complete before another hot-plug operation can be done on that particular slot. This patch introduces the slot->hotplug_lock to ensure that any hotplug operations (add / remove) complete before another hotplug event can begin processing on that particular slot. Signed-off-by: Rajat Jain <rajatxjain@gmail.com> Signed-off-by: Rajat Jain <rajatjain@juniper.net> Signed-off-by: Guenter Roeck <groeck@juniper.net> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/hotplug/pciehp.h1
-rw-r--r--drivers/pci/hotplug/pciehp_core.c7
-rw-r--r--drivers/pci/hotplug/pciehp_ctrl.c17
-rw-r--r--drivers/pci/hotplug/pciehp_hpc.c1
4 files changed, 23 insertions, 3 deletions
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index d8d03361..8a66866 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -76,6 +76,7 @@ struct slot {
struct hotplug_slot *hotplug_slot;
struct delayed_work work; /* work for button event */
struct mutex lock;
+ struct mutex hotplug_lock;
struct workqueue_struct *wq;
};
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 53b58de..23b4bde 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -283,8 +283,11 @@ static int pciehp_probe(struct pcie_device *dev)
slot = ctrl->slot;
pciehp_get_adapter_status(slot, &occupied);
pciehp_get_power_status(slot, &poweron);
- if (occupied && pciehp_force)
+ if (occupied && pciehp_force) {
+ mutex_lock(&slot->hotplug_lock);
pciehp_enable_slot(slot);
+ mutex_unlock(&slot->hotplug_lock);
+ }
/* If empty slot's power status is on, turn power off */
if (!occupied && poweron && POWER_CTRL(ctrl))
pciehp_power_off_slot(slot);
@@ -328,10 +331,12 @@ static int pciehp_resume (struct pcie_device *dev)
/* Check if slot is occupied */
pciehp_get_adapter_status(slot, &status);
+ mutex_lock(&slot->hotplug_lock);
if (status)
pciehp_enable_slot(slot);
else
pciehp_disable_slot(slot);
+ mutex_unlock(&slot->hotplug_lock);
return 0;
}
#endif /* PM */
diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 3e40ec0..fec99a1 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -293,6 +293,7 @@ static void pciehp_power_thread(struct work_struct *work)
struct power_work_info *info =
container_of(work, struct power_work_info, work);
struct slot *p_slot = info->p_slot;
+ int ret;
switch (info->req) {
case DISABLE_REQ:
@@ -300,7 +301,9 @@ static void pciehp_power_thread(struct work_struct *work)
"Disabling domain:bus:device=%04x:%02x:00\n",
pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
p_slot->ctrl->pcie->port->subordinate->number);
+ mutex_lock(&p_slot->hotplug_lock);
pciehp_disable_slot(p_slot);
+ mutex_unlock(&p_slot->hotplug_lock);
mutex_lock(&p_slot->lock);
p_slot->state = STATIC_STATE;
mutex_unlock(&p_slot->lock);
@@ -310,7 +313,10 @@ static void pciehp_power_thread(struct work_struct *work)
"Enabling domain:bus:device=%04x:%02x:00\n",
pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
p_slot->ctrl->pcie->port->subordinate->number);
- if (pciehp_enable_slot(p_slot))
+ mutex_lock(&p_slot->hotplug_lock);
+ ret = pciehp_enable_slot(p_slot);
+ mutex_unlock(&p_slot->hotplug_lock);
+ if (ret)
pciehp_green_led_off(p_slot);
mutex_lock(&p_slot->lock);
p_slot->state = STATIC_STATE;
@@ -546,6 +552,9 @@ static void interrupt_event_handler(struct work_struct *work)
kfree(info);
}
+/*
+ * Note: This function must be called with slot->hotplug_lock held
+ */
int pciehp_enable_slot(struct slot *p_slot)
{
u8 getstatus = 0;
@@ -584,7 +593,9 @@ int pciehp_enable_slot(struct slot *p_slot)
return rc;
}
-
+/*
+ * Note: This function must be called with slot->hotplug_lock held
+ */
int pciehp_disable_slot(struct slot *p_slot)
{
u8 getstatus = 0;
@@ -617,7 +628,9 @@ int pciehp_sysfs_enable_slot(struct slot *p_slot)
case STATIC_STATE:
p_slot->state = POWERON_STATE;
mutex_unlock(&p_slot->lock);
+ mutex_lock(&p_slot->hotplug_lock);
retval = pciehp_enable_slot(p_slot);
+ mutex_unlock(&p_slot->hotplug_lock);
mutex_lock(&p_slot->lock);
p_slot->state = STATIC_STATE;
break;
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 6433e73..da4b020 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -686,6 +686,7 @@ static int pcie_init_slot(struct controller *ctrl)
slot->ctrl = ctrl;
mutex_init(&slot->lock);
+ mutex_init(&slot->hotplug_lock);
INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
ctrl->slot = slot;
return 0;
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