[media] vb2-dma-sg: add debug module option

This prevents the kernel log from being spammed with these messages.
By turning on the debug option you will see them again.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c
index 952776fafe2ca91ccd58c50853a8843f871ed085..59522b2ebae1027e88282dc40904f1df11ac898e 100644 (file)
--- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
@@ -21,6 +21,15 @@
 #include <media/videobuf2-memops.h>
 #include <media/videobuf2-dma-sg.h>
 
+static int debug;
+module_param(debug, int, 0644);
+
+#define dprintk(level, fmt, arg...)                                    \
+       do {                                                            \
+               if (debug >= level)                                     \
+                       printk(KERN_DEBUG "vb2-dma-sg: " fmt, ## arg);  \
+       } while (0)
+
 struct vb2_dma_sg_buf {
        void                            *vaddr;
        struct page                     **pages;
@@ -74,7 +83,7 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, gfp_t gfp_fla
 
        atomic_inc(&buf->refcount);
 
-       printk(KERN_DEBUG "%s: Allocated buffer of %d pages\n",
+       dprintk(1, "%s: Allocated buffer of %d pages\n",
                __func__, buf->sg_desc.num_pages);
        return buf;
 
@@ -97,7 +106,7 @@ static void vb2_dma_sg_put(void *buf_priv)
        int i = buf->sg_desc.num_pages;
 
        if (atomic_dec_and_test(&buf->refcount)) {
-               printk(KERN_DEBUG "%s: Freeing buffer of %d pages\n", __func__,
+               dprintk(1, "%s: Freeing buffer of %d pages\n", __func__,
                        buf->sg_desc.num_pages);
                if (buf->vaddr)
                        vm_unmap_ram(buf->vaddr, buf->sg_desc.num_pages);
@@ -163,7 +172,7 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,
        return buf;
 
 userptr_fail_get_user_pages:
-       printk(KERN_DEBUG "get_user_pages requested/got: %d/%d]\n",
+       dprintk(1, "get_user_pages requested/got: %d/%d]\n",
               num_pages_from_user, buf->sg_desc.num_pages);
        while (--num_pages_from_user >= 0)
                put_page(buf->pages[num_pages_from_user]);
@@ -186,7 +195,7 @@ static void vb2_dma_sg_put_userptr(void *buf_priv)
        struct vb2_dma_sg_buf *buf = buf_priv;
        int i = buf->sg_desc.num_pages;
 
-       printk(KERN_DEBUG "%s: Releasing userspace buffer of %d pages\n",
+       dprintk(1, "%s: Releasing userspace buffer of %d pages\n",
               __func__, buf->sg_desc.num_pages);
        if (buf->vaddr)
                vm_unmap_ram(buf->vaddr, buf->sg_desc.num_pages);