[media] lirc: use kfifo_initialized() on lirc_buffer's fifo

We can use kfifo_initialized() to check if the fifo in lirc_buffer is
initialized or not. There's no need to have a dedicated fifo status
variable in lirc_buffer.

[m.chehab@samsung.com: add the same change to lirc_zilog, to avoid
 breaking compilation of staging drivers]
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

2 files changed, 3 insertions, 7 deletions

diff --git a/drivers/staging/media/lirc/lirc_zilog.c b/drivers/staging/media/lirc/lirc_zilog.c
index 567feba0011c..1ccf6262ab36 100644
--- a/drivers/staging/media/lirc/lirc_zilog.c
+++ b/drivers/staging/media/lirc/lirc_zilog.c
@@ -199,7 +199,7 @@ static void release_ir_device(struct kref *ref)
                 lirc_unregister_driver(ir->l.minor);
                 ir->l.minor = MAX_IRCTL_DEVICES;
         }
-        if (ir->rbuf.fifo_initialized)
+        if (kfifo_initialized(&ir->rbuf.fifo))
                 lirc_buffer_free(&ir->rbuf);
         list_del(&ir->list);
         kfree(ir);
diff --git a/include/media/lirc_dev.h b/include/media/lirc_dev.h
index 78f0637ca68d..05e7ad5d2c8b 100644
--- a/include/media/lirc_dev.h
+++ b/include/media/lirc_dev.h
@@ -29,14 +29,13 @@ struct lirc_buffer {
         /* Using chunks instead of bytes pretends to simplify boundary checking
          * And should allow for some performance fine tunning later */
         struct kfifo fifo;
-        u8 fifo_initialized;
 };
 
 static inline void lirc_buffer_clear(struct lirc_buffer *buf)
 {
         unsigned long flags;
 
-        if (buf->fifo_initialized) {
+        if (kfifo_initialized(&buf->fifo)) {
                 spin_lock_irqsave(&buf->fifo_lock, flags);
                 kfifo_reset(&buf->fifo);
                 spin_unlock_irqrestore(&buf->fifo_lock, flags);
@@ -56,17 +55,14 @@ static inline int lirc_buffer_init(struct lirc_buffer *buf,
         buf->chunk_size = chunk_size;
         buf->size = size;
         ret = kfifo_alloc(&buf->fifo, size * chunk_size, GFP_KERNEL);
-        if (ret == 0)
-                buf->fifo_initialized = 1;
 
         return ret;
 }
 
 static inline void lirc_buffer_free(struct lirc_buffer *buf)
 {
-        if (buf->fifo_initialized) {
+        if (kfifo_initialized(&buf->fifo)) {
                 kfifo_free(&buf->fifo);
-                buf->fifo_initialized = 0;
         } else
                 WARN(1, "calling %s on an uninitialized lirc_buffer\n",
                      __func__);