vm: convert snd_pcm_lib_mmap_iomem() to vm_iomap_memory() helper

This is my example conversion of a few existing mmap users.  The pcm
mmap case is one of the more straightforward ones.

Acked-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 10 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 71ae86ca64ac..eb560fa32321 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3222,18 +3222,10 @@ EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
                            struct vm_area_struct *area)
 {
-        long size;
-        unsigned long offset;
+        struct snd_pcm_runtime *runtime = substream->runtime;;
 
         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
-        area->vm_flags |= VM_IO;
-        size = area->vm_end - area->vm_start;
-        offset = area->vm_pgoff << PAGE_SHIFT;
-        if (io_remap_pfn_range(area, area->vm_start,
-                                (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
-                                size, area->vm_page_prot))
-                return -EAGAIN;
-        return 0;
+        return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
 }
 
 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);