conditional alloc_ctx type based on kernel version

diff --git a/vdummy.c b/vdummy.c
index b434b6f..240d4f8 100644 (file)
--- a/vdummy.c
+++ b/vdummy.c
@@ -5,6 +5,7 @@
 #include <linux/slab.h>
 #include <linux/hrtimer.h>
 #include <linux/ktime.h>
+#include <linux/version.h>
 #include <asm/uaccess.h>
 #include <linux/videodev2.h>
 #include <media/videobuf2-vmalloc.h>
@@ -32,8 +33,15 @@ static int ioctl_get_parm(struct file *file, void *fh, struct v4l2_streamparm *f
 static int ioctl_set_parm(struct file *file, void *fh, struct v4l2_streamparm *fmt);
 static int ioctl_queryctl(struct file *file, void *fh, struct v4l2_queryctrl *ctl);
 
+/* TODO find out exact version where this switched over */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,7,0)
+#define ALLOC_CTX_TYPE void
+#else
+#define ALLOC_CTX_TYPE struct device
+#endif
+
 static int queue_setup(struct vb2_queue *vbq, unsigned int *nbuf,
-               unsigned int *nplanes, unsigned int *sizes, struct device **alloc_ctx);
+               unsigned int *nplanes, unsigned int *sizes, ALLOC_CTX_TYPE **alloc_ctx);
 static int buf_prepare(struct vb2_buffer *vb);
 static void buf_queue(struct vb2_buffer *vb);
 static int start_streaming(struct vb2_queue *vbq, unsigned int count);
@@ -301,7 +309,7 @@ static int ioctl_queryctl(struct file *file, void *fh, struct v4l2_queryctrl *ct
 }
 
 static int queue_setup(struct vb2_queue *vbq, unsigned int *nbuf,
-               unsigned int *nplanes, unsigned int *sizes, struct device **alloc_ctx)
+               unsigned int *nplanes, unsigned int *sizes, ALLOC_CTX_TYPE **alloc_ctx)
 {
        if(vbq->num_buffers + *nbuf < 2) {
                *nbuf = 2 - vbq->num_buffers;