On Friday, June 14, 2013 10:05:47 PM Jiang Liu wrote:
> On 06/14/2013 02:28 AM, Rafael J. Wysocki wrote:
> > On Friday, June 14, 2013 12:32:28 AM Jiang Liu wrote:
> >> All dock device related data structures are created during driver
> >> initialization, so kill the redundant spin lock in dock device object.
> >
> > As a cleanup, it definitely makes sense, but does it fix anything?
> >
> > Rafael
> Patch 3-9 are code cleanup only, I will resend them as separate patchset
> later.
Cool, thanks!
Rafael
> >> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
> >> Cc: Shaohua Li <shaohua.li@xxxxxxxxx>
> >> Cc: Len Brown <lenb@xxxxxxxxxx>
> >> Cc: "Rafael J. Wysocki" <rjw@xxxxxxx>
> >> Cc: linux-acpi@xxxxxxxxxxxxxxx
> >> Cc: linux-kernel@xxxxxxxxxxxxxxx
> >> ---
> >> drivers/acpi/dock.c | 15 +++------------
> >> 1 file changed, 3 insertions(+), 12 deletions(-)
> >>
> >> diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
> >> index 8e578aa..cd2d5df 100644
> >> --- a/drivers/acpi/dock.c
> >> +++ b/drivers/acpi/dock.c
> >> @@ -57,7 +57,6 @@ struct dock_station {
> >> acpi_handle handle;
> >> unsigned long last_dock_time;
> >> u32 flags;
> >> - spinlock_t dd_lock;
> >> struct mutex hp_lock;
> >> struct task_struct *owner;
> >> struct list_head dependent_devices;
> >> @@ -107,10 +106,7 @@ add_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
> >> dd->handle = handle;
> >> INIT_LIST_HEAD(&dd->list);
> >> INIT_LIST_HEAD(&dd->hotplug_list);
> >> -
> >> - spin_lock(&ds->dd_lock);
> >> list_add_tail(&dd->list, &ds->dependent_devices);
> >> - spin_unlock(&ds->dd_lock);
> >>
> >> return 0;
> >> }
> >> @@ -168,14 +164,10 @@ find_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
> >> {
> >> struct dock_dependent_device *dd;
> >>
> >> - spin_lock(&ds->dd_lock);
> >> - list_for_each_entry(dd, &ds->dependent_devices, list) {
> >> - if (handle == dd->handle) {
> >> - spin_unlock(&ds->dd_lock);
> >> + list_for_each_entry(dd, &ds->dependent_devices, list)
> >> + if (handle == dd->handle)
> >> return dd;
> >> - }
> >> - }
> >> - spin_unlock(&ds->dd_lock);
> >> +
> >> return NULL;
> >> }
> >>
> >> @@ -964,7 +956,6 @@ static int __init dock_add(acpi_handle handle)
> >> dock_station->last_dock_time = jiffies - HZ;
> >>
> >> mutex_init(&dock_station->hp_lock);
> >> - spin_lock_init(&dock_station->dd_lock);
> >> INIT_LIST_HEAD(&dock_station->sibling);
> >> INIT_LIST_HEAD(&dock_station->hotplug_devices);
> >> INIT_LIST_HEAD(&dock_station->dependent_devices);
> >>
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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