diff options
| author | Alan Jenkins <alan-jenkins@tuffmail.co.uk> | 2009-08-28 14:56:33 +0200 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-08-28 21:21:11 +0200 |
| commit | dcf443b5813074031a45b05ad9c57da98bcae329 (patch) | |
| tree | a5f9174917244e639efab172f9cab1552c7dac7c | |
| parent | eeepc-laptop: don't touch the pci slot if it was claimed by a different driver (diff) | |
| download | linux-dcf443b5813074031a45b05ad9c57da98bcae329.tar.xz linux-dcf443b5813074031a45b05ad9c57da98bcae329.zip | |
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>
| -rw-r--r-- | drivers/platform/x86/eeepc-laptop.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c index 69d73ed2c8ab..179010386981 100644 --- a/drivers/platform/x86/eeepc-laptop.c +++ b/drivers/platform/x86/eeepc-laptop.c @@ -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"); |