[PATCH] host1x: cdma: use completion instead of semaphore

[Arnd Bergmann]

In this usage, the two are completely equivalent, but the
completion documents better what is going on, and we generally
try to avoid semaphores these days.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/gpu/host1x/cdma.c | 6 +++---
 drivers/gpu/host1x/cdma.h | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/host1x/cdma.c b/drivers/gpu/host1x/cdma.c
index 6bfb3e6f43d7..bdc80a303cec 100644
--- a/drivers/gpu/host1x/cdma.c
+++ b/drivers/gpu/host1x/cdma.c
@@ -204,7 +204,7 @@ unsigned int host1x_cdma_wait_locked(struct host1x_cdma 
*cdma,
                cdma->event = event;
 
                mutex_unlock(&cdma->lock);
-               down(&cdma->sem);
+               wait_for_completion(&cdma->complete);
                mutex_lock(&cdma->lock);
        }
 
@@ -308,7 +308,7 @@ static void update_cdma_locked(struct host1x_cdma *cdma)
 
        if (signal) {
                cdma->event = CDMA_EVENT_NONE;
-               up(&cdma->sem);
+               complete(&cdma->complete);
        }
 }
 
@@ -410,7 +410,7 @@ int host1x_cdma_init(struct host1x_cdma *cdma)
        int err;
 
        mutex_init(&cdma->lock);
-       sema_init(&cdma->sem, 0);
+       init_completion(&cdma->complete);
 
        INIT_LIST_HEAD(&cdma->sync_queue);
 
diff --git a/drivers/gpu/host1x/cdma.h b/drivers/gpu/host1x/cdma.h
index c628070b94d7..ba790f9bfebc 100644
--- a/drivers/gpu/host1x/cdma.h
+++ b/drivers/gpu/host1x/cdma.h
@@ -20,7 +20,7 @@
 #define __HOST1X_CDMA_H
 
 #include <linux/sched.h>
-#include <linux/semaphore.h>
+#include <linux/completion.h>
 #include <linux/list.h>
 
 struct host1x_syncpt;
@@ -70,7 +70,7 @@ enum cdma_event {
 
 struct host1x_cdma {
        struct mutex lock;              /* controls access to shared state */
-       struct semaphore sem;           /* signalled when event occurs */
+       struct completion complete;     /* signalled when event occurs */
        enum cdma_event event;          /* event that sem is waiting for */
        unsigned int slots_used;        /* pb slots used in current submit */
        unsigned int slots_free;        /* pb slots free in current submit */
-- 
2.20.0

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