[media] s5p-mfc: Use printk_ratelimited for reporting ioctl errors

Some applications don't check error codes from QBUF/DQBUF ioctls,
so don't spam kernel log with errors if they fall into endless loop
trying to queue next buffer after a failure.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/s5p-mfc/s5p_mfc_debug.h

@@ -39,6 +39,12 @@ extern int mfc_debug_level;
 		       __func__, __LINE__, ##args);	\
 	} while (0)
 
+#define mfc_err_limited(fmt, args...)			\
+	do {						\
+		printk_ratelimited(KERN_ERR "%s:%d: " fmt,	\
+		       __func__, __LINE__, ##args);	\
+	} while (0)
+
 #define mfc_info(fmt, args...)				\
 	do {						\
 		printk(KERN_INFO "%s:%d: " fmt,		\

drivers/media/platform/s5p-mfc/s5p_mfc_dec.c

@@ -642,7 +642,7 @@ static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 	int ret;
 
 	if (ctx->state == MFCINST_ERROR) {
-		mfc_err("Call on DQBUF after unrecoverable error\n");
+		mfc_err_limited("Call on DQBUF after unrecoverable error\n");
 		return -EIO;
 	}
 

drivers/media/platform/s5p-mfc/s5p_mfc_enc.c

@@ -1268,7 +1268,7 @@ static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 	int ret;
 
 	if (ctx->state == MFCINST_ERROR) {
-		mfc_err("Call on DQBUF after unrecoverable error\n");
+		mfc_err_limited("Call on DQBUF after unrecoverable error\n");
 		return -EIO;
 	}
 	if (buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {