diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/video/videobuf-vmalloc.c | 36 |
1 files changed, 27 insertions, 9 deletions
diff --git a/drivers/media/video/videobuf-vmalloc.c b/drivers/media/video/videobuf-vmalloc.c index 075acdf6b7c..73627d380f0 100644 --- a/drivers/media/video/videobuf-vmalloc.c +++ b/drivers/media/video/videobuf-vmalloc.c @@ -57,19 +57,20 @@ videobuf_vm_open(struct vm_area_struct *vma) map->count++; } -static void -videobuf_vm_close(struct vm_area_struct *vma) +static void videobuf_vm_close(struct vm_area_struct *vma) { struct videobuf_mapping *map = vma->vm_private_data; struct videobuf_queue *q = map->q; int i; - dprintk(2,"vm_close %p [count=%u,vma=%08lx-%08lx]\n",map, - map->count,vma->vm_start,vma->vm_end); + dprintk(2,"vm_close %p [count=%u,vma=%08lx-%08lx]\n", map, + map->count, vma->vm_start, vma->vm_end); map->count--; if (0 == map->count) { - dprintk(1,"munmap %p q=%p\n",map,q); + struct videobuf_vmalloc_memory *mem; + + dprintk(1, "munmap %p q=%p\n", map, q); mutex_lock(&q->vb_lock); for (i = 0; i < VIDEO_MAX_FRAME; i++) { if (NULL == q->bufs[i]) @@ -78,6 +79,18 @@ videobuf_vm_close(struct vm_area_struct *vma) if (q->bufs[i]->map != map) continue; + mem = q->bufs[i]->priv; + if (mem) { + /* This callback is called only if kernel has + allocated memory and this memory is mmapped. + In this case, memory should be freed, + in order to do memory unmap. + */ + MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); + vfree(mem->vmalloc); + mem->vmalloc = NULL; + } + q->bufs[i]->map = NULL; q->bufs[i]->baddr = 0; } @@ -390,6 +403,15 @@ void videobuf_vmalloc_free (struct videobuf_buffer *buf) { struct videobuf_vmalloc_memory *mem = buf->priv; + /* mmapped memory can't be freed here, otherwise mmapped region + would be released, while still needed. In this case, the memory + release should happen inside videobuf_vm_close(). + So, it should free memory only if the memory were allocated for + read() operation. + */ + if ((buf->memory != V4L2_MEMORY_USERPTR) || (buf->baddr == 0)) + return; + if (!mem) return; @@ -398,10 +420,6 @@ void videobuf_vmalloc_free (struct videobuf_buffer *buf) vfree(mem->vmalloc); mem->vmalloc = NULL; - - - /* FIXME: need to do buf->priv = NULL? */ - return; } EXPORT_SYMBOL_GPL(videobuf_vmalloc_free); |