dma-buf/sw-sync: Reduce irqsave/irqrestore from known context

If we know the context under which we are called, then we can use the
simpler form of spin_lock_irq (saving the save/restore).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170629125930.821-4-chris@chris-wilson.co.uk

2 files changed, 15 insertions, 14 deletions

diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c
index 0e676d08aa70..fc733621987d 100644
--- a/drivers/dma-buf/sw_sync.c
+++ b/drivers/dma-buf/sw_sync.c
@@ -135,12 +135,11 @@ static void sync_timeline_put(struct sync_timeline *obj)
  */
 static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc)
 {
-        unsigned long flags;
         struct sync_pt *pt, *next;
 
         trace_sync_timeline(obj);
 
-        spin_lock_irqsave(&obj->child_list_lock, flags);
+        spin_lock_irq(&obj->child_list_lock);
 
         obj->value += inc;
 
@@ -150,7 +149,7 @@ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc)
                         list_del_init(&pt->active_list);
         }
 
-        spin_unlock_irqrestore(&obj->child_list_lock, flags);
+        spin_unlock_irq(&obj->child_list_lock);
 }
 
 /**
@@ -167,7 +166,6 @@ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc)
 static struct sync_pt *sync_pt_create(struct sync_timeline *obj, int size,
                              unsigned int value)
 {
-        unsigned long flags;
         struct sync_pt *pt;
 
         if (size < sizeof(*pt))
@@ -177,13 +175,16 @@ static struct sync_pt *sync_pt_create(struct sync_timeline *obj, int size,
         if (!pt)
                 return NULL;
 
-        spin_lock_irqsave(&obj->child_list_lock, flags);
+        spin_lock_irq(&obj->child_list_lock);
+
         sync_timeline_get(obj);
         dma_fence_init(&pt->base, &timeline_fence_ops, &obj->child_list_lock,
                        obj->context, value);
         list_add_tail(&pt->child_list, &obj->child_list_head);
         INIT_LIST_HEAD(&pt->active_list);
-        spin_unlock_irqrestore(&obj->child_list_lock, flags);
+
+        spin_unlock_irq(&obj->child_list_lock);
+
         return pt;
 }
 
@@ -206,9 +207,11 @@ static void timeline_fence_release(struct dma_fence *fence)
         unsigned long flags;
 
         spin_lock_irqsave(fence->lock, flags);
+
         list_del(&pt->child_list);
         if (!list_empty(&pt->active_list))
                 list_del(&pt->active_list);
+
         spin_unlock_irqrestore(fence->lock, flags);
 
         sync_timeline_put(parent);
diff --git a/drivers/dma-buf/sync_debug.c b/drivers/dma-buf/sync_debug.c
index 82a6e7f6d37f..0e91632248ba 100644
--- a/drivers/dma-buf/sync_debug.c
+++ b/drivers/dma-buf/sync_debug.c
@@ -116,17 +116,16 @@ static void sync_print_fence(struct seq_file *s,
 static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
 {
         struct list_head *pos;
-        unsigned long flags;
 
         seq_printf(s, "%s: %d\n", obj->name, obj->value);
 
-        spin_lock_irqsave(&obj->child_list_lock, flags);
+        spin_lock_irq(&obj->child_list_lock);
         list_for_each(pos, &obj->child_list_head) {
                 struct sync_pt *pt =
                         container_of(pos, struct sync_pt, child_list);
                 sync_print_fence(s, &pt->base, false);
         }
-        spin_unlock_irqrestore(&obj->child_list_lock, flags);
+        spin_unlock_irq(&obj->child_list_lock);
 }
 
 static void sync_print_sync_file(struct seq_file *s,
@@ -151,12 +150,11 @@ static void sync_print_sync_file(struct seq_file *s,
 
 static int sync_debugfs_show(struct seq_file *s, void *unused)
 {
-        unsigned long flags;
         struct list_head *pos;
 
         seq_puts(s, "objs:\n--------------\n");
 
-        spin_lock_irqsave(&sync_timeline_list_lock, flags);
+        spin_lock_irq(&sync_timeline_list_lock);
         list_for_each(pos, &sync_timeline_list_head) {
                 struct sync_timeline *obj =
                         container_of(pos, struct sync_timeline,
@@ -165,11 +163,11 @@ static int sync_debugfs_show(struct seq_file *s, void *unused)
                 sync_print_obj(s, obj);
                 seq_putc(s, '\n');
         }
-        spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
+        spin_unlock_irq(&sync_timeline_list_lock);
 
         seq_puts(s, "fences:\n--------------\n");
 
-        spin_lock_irqsave(&sync_file_list_lock, flags);
+        spin_lock_irq(&sync_file_list_lock);
         list_for_each(pos, &sync_file_list_head) {
                 struct sync_file *sync_file =
                         container_of(pos, struct sync_file, sync_file_list);
@@ -177,7 +175,7 @@ static int sync_debugfs_show(struct seq_file *s, void *unused)
                 sync_print_sync_file(s, sync_file);
                 seq_putc(s, '\n');
         }
-        spin_unlock_irqrestore(&sync_file_list_lock, flags);
+        spin_unlock_irq(&sync_file_list_lock);
         return 0;
 }