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eeepc-laptop: use a mutex to serialize pci hotplug (resume vs. notify) 

Commit d0265f0 "eeepc-laptop: fix hot-unplug on resume" used a workqueue
to protect pci hotplug against multiple simultaneous calls during
resume.  It seems to work, but a mutex would be more appropriate.

This is in preparation to fix the potential pci hotplug race on unload.

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Alan Jenkins 2009-08-28 12:56:33 +00:00 committed by Len Brown
parent 6d41839e76
commit dcf443b581
1 changed files with 13 additions and 8 deletions
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21
drivers/platform/x86/eeepc-laptop.c
View File

@ -143,7 +143,7 @@ struct eeepc_hotk {
struct rfkill *bluetooth_rfkill;
struct rfkill *wwan3g_rfkill;
struct hotplug_slot *hotplug_slot;
struct work_struct hotplug_work;
struct mutex hotplug_lock;
};
/* The actual device the driver binds to */
@ -661,7 +661,7 @@ static int eeepc_get_adapter_status(struct hotplug_slot *hotplug_slot,
return 0;
}
static void eeepc_hotplug_work(struct work_struct *work)
static void eeepc_rfkill_hotplug(void)
{
struct pci_dev *dev;
struct pci_bus *bus;
@ -669,13 +669,15 @@ static void eeepc_hotplug_work(struct work_struct *work)
rfkill_set_sw_state(ehotk->wlan_rfkill, blocked);
mutex_lock(&ehotk->hotplug_lock);
if (ehotk->hotplug_slot == NULL)
return;
goto out_unlock;
bus = pci_find_bus(0, 1);
if (!bus) {
pr_warning("Unable to find PCI bus 1?\n");
return;
goto out_unlock;
}
if (!blocked) {
@ -683,7 +685,7 @@ static void eeepc_hotplug_work(struct work_struct *work)
if (dev) {
/* Device already present */
pci_dev_put(dev);
return;
goto out_unlock;
}
dev = pci_scan_single_device(bus, 0);
if (dev) {
@ -698,6 +700,9 @@ static void eeepc_hotplug_work(struct work_struct *work)
pci_dev_put(dev);
}
}
out_unlock:
mutex_unlock(&ehotk->hotplug_lock);
}
static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
@ -705,7 +710,7 @@ static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
if (event != ACPI_NOTIFY_BUS_CHECK)
return;
schedule_work(&ehotk->hotplug_work);
eeepc_rfkill_hotplug();
}
static void eeepc_hotk_notify(struct acpi_device *device, u32 event)
@ -896,7 +901,7 @@ static int eeepc_hotk_resume(struct acpi_device *device)
rfkill_set_sw_state(ehotk->wlan_rfkill, wlan != 1);
schedule_work(&ehotk->hotplug_work);
eeepc_rfkill_hotplug();
}
if (ehotk->bluetooth_rfkill)
@ -1097,7 +1102,7 @@ static int eeepc_rfkill_init(struct device *dev)
{
int result = 0;
INIT_WORK(&ehotk->hotplug_work, eeepc_hotplug_work);
mutex_init(&ehotk->hotplug_lock);
eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P6");
eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P7");