Merge branch 'topic/nomm' into for-linus
[linux-2.6.git] / sound / core / pcm_native.c
index b9517f3..4c3edc1 100644 (file)
@@ -3440,14 +3440,28 @@ out:
 #endif /* CONFIG_SND_SUPPORT_OLD_API */
 
 #ifndef CONFIG_MMU
-unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
-                                     unsigned long len, unsigned long pgoff,
-                                     unsigned long flags)
-{
-       return 0;
+static unsigned long snd_pcm_get_unmapped_area(struct file *file,
+                                              unsigned long addr,
+                                              unsigned long len,
+                                              unsigned long pgoff,
+                                              unsigned long flags)
+{
+       struct snd_pcm_file *pcm_file = file->private_data;
+       struct snd_pcm_substream *substream = pcm_file->substream;
+       struct snd_pcm_runtime *runtime = substream->runtime;
+       unsigned long offset = pgoff << PAGE_SHIFT;
+
+       switch (offset) {
+       case SNDRV_PCM_MMAP_OFFSET_STATUS:
+               return (unsigned long)runtime->status;
+       case SNDRV_PCM_MMAP_OFFSET_CONTROL:
+               return (unsigned long)runtime->control;
+       default:
+               return (unsigned long)runtime->dma_area + offset;
+       }
 }
 #else
-# define dummy_get_unmapped_area NULL
+# define snd_pcm_get_unmapped_area NULL
 #endif
 
 /*
@@ -3467,7 +3481,7 @@ const struct file_operations snd_pcm_f_ops[2] = {
                .compat_ioctl =         snd_pcm_ioctl_compat,
                .mmap =                 snd_pcm_mmap,
                .fasync =               snd_pcm_fasync,
-               .get_unmapped_area =    dummy_get_unmapped_area,
+               .get_unmapped_area =    snd_pcm_get_unmapped_area,
        },
        {
                .owner =                THIS_MODULE,
@@ -3481,6 +3495,6 @@ const struct file_operations snd_pcm_f_ops[2] = {
                .compat_ioctl =         snd_pcm_ioctl_compat,
                .mmap =                 snd_pcm_mmap,
                .fasync =               snd_pcm_fasync,
-               .get_unmapped_area =    dummy_get_unmapped_area,
+               .get_unmapped_area =    snd_pcm_get_unmapped_area,
        }
 };