[PATCH] mm: incorrect VM_FAULT_OOM returns from drivers

Some drivers are returning OOM when it is not in response to a memory
shortage.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Dave Airlie <airlied@linux.ie>
Cc: Jaroslav Kysela <perex@suse.cz>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c
index b40ae43..ae26919 100644 (file)
--- a/drivers/char/drm/drm_vm.c
+++ b/drivers/char/drm/drm_vm.c
@@ -147,14 +147,14 @@ static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
        if (address > vma->vm_end)
                return NOPAGE_SIGBUS;   /* Disallow mremap */
        if (!map)
-               return NOPAGE_OOM;      /* Nothing allocated */
+               return NOPAGE_SIGBUS;   /* Nothing allocated */
 
        offset = address - vma->vm_start;
        i = (unsigned long)map->handle + offset;
        page = (map->type == _DRM_CONSISTENT) ?
                virt_to_page((void *)i) : vmalloc_to_page((void *)i);
        if (!page)
-               return NOPAGE_OOM;
+               return NOPAGE_SIGBUS;
        get_page(page);
 
        DRM_DEBUG("shm_nopage 0x%lx\n", address);
@@ -272,7 +272,7 @@ static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
        if (address > vma->vm_end)
                return NOPAGE_SIGBUS;   /* Disallow mremap */
        if (!dma->pagelist)
-               return NOPAGE_OOM;      /* Nothing allocated */
+               return NOPAGE_SIGBUS;   /* Nothing allocated */
 
        offset = address - vma->vm_start;       /* vm_[pg]off[set] should be 0 */
        page_nr = offset >> PAGE_SHIFT;
@@ -310,7 +310,7 @@ static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
        if (address > vma->vm_end)
                return NOPAGE_SIGBUS;   /* Disallow mremap */
        if (!entry->pagelist)
-               return NOPAGE_OOM;      /* Nothing allocated */
+               return NOPAGE_SIGBUS;   /* Nothing allocated */
 
        offset = address - vma->vm_start;
        map_offset = map->offset - (unsigned long)dev->sg->virtual;

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 66e24b5..6ea67b1 100644 (file)
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3027,7 +3027,7 @@ static struct page * snd_pcm_mmap_status_nopage(struct vm_area_struct *area,
        struct page * page;
        
        if (substream == NULL)
-               return NOPAGE_OOM;
+               return NOPAGE_SIGBUS;
        runtime = substream->runtime;
        page = virt_to_page(runtime->status);
        get_page(page);
@@ -3070,7 +3070,7 @@ static struct page * snd_pcm_mmap_control_nopage(struct vm_area_struct *area,
        struct page * page;
        
        if (substream == NULL)
-               return NOPAGE_OOM;
+               return NOPAGE_SIGBUS;
        runtime = substream->runtime;
        page = virt_to_page(runtime->control);
        get_page(page);
@@ -3131,18 +3131,18 @@ static struct page *snd_pcm_mmap_data_nopage(struct vm_area_struct *area,
        size_t dma_bytes;
        
        if (substream == NULL)
-               return NOPAGE_OOM;
+               return NOPAGE_SIGBUS;
        runtime = substream->runtime;
        offset = area->vm_pgoff << PAGE_SHIFT;
        offset += address - area->vm_start;
-       snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_OOM);
+       snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_SIGBUS);
        dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
        if (offset > dma_bytes - PAGE_SIZE)
                return NOPAGE_SIGBUS;
        if (substream->ops->page) {
                page = substream->ops->page(substream, offset);
                if (! page)
-                       return NOPAGE_OOM;
+                       return NOPAGE_OOM; /* XXX: is this really due to OOM? */
        } else {
                vaddr = runtime->dma_area + offset;
                page = virt_to_page(vaddr);

diff --git a/sound/oss/via82cxxx_audio.c b/sound/oss/via82cxxx_audio.c
index 17837d4..c96cc8c 100644 (file)
--- a/sound/oss/via82cxxx_audio.c
+++ b/sound/oss/via82cxxx_audio.c
@@ -2120,8 +2120,8 @@ static struct page * via_mm_nopage (struct vm_area_struct * vma,
                return NOPAGE_SIGBUS; /* Disallow mremap */
        }
         if (!card) {
-               DPRINTK ("EXIT, returning NOPAGE_OOM\n");
-               return NOPAGE_OOM;      /* Nothing allocated */
+               DPRINTK ("EXIT, returning NOPAGE_SIGBUS\n");
+               return NOPAGE_SIGBUS;   /* Nothing allocated */
        }
 
        pgoff = vma->vm_pgoff + ((address - vma->vm_start) >> PAGE_SHIFT);

diff --git a/sound/usb/usx2y/usX2Yhwdep.c b/sound/usb/usx2y/usX2Yhwdep.c
index 4b52d18..b76b3dd 100644 (file)
--- a/sound/usb/usx2y/usX2Yhwdep.c
+++ b/sound/usb/usx2y/usX2Yhwdep.c
@@ -48,7 +48,7 @@ static struct page * snd_us428ctls_vm_nopage(struct vm_area_struct *area, unsign
        
        offset = area->vm_pgoff << PAGE_SHIFT;
        offset += address - area->vm_start;
-       snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_OOM);
+       snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_SIGBUS);
        vaddr = (char*)((struct usX2Ydev *)area->vm_private_data)->us428ctls_sharedmem + offset;
        page = virt_to_page(vaddr);
        get_page(page);