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| author | Hugh Dickins <hugh@veritas.com> | 2005-11-22 06:32:13 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-22 18:13:42 +0100 |
| commit | 1cdca61bf8537043edde8ef784ce1a1351361dac (patch) | |
| tree | db9d45f8616240758cea40f5f657879f47f058fe /sound/usb/usx2y | |
| parent | [PATCH] unpaged: private write VM_RESERVED (diff) | |
| download | linux-1cdca61bf8537043edde8ef784ce1a1351361dac.tar.xz linux-1cdca61bf8537043edde8ef784ce1a1351361dac.zip | |
[PATCH] unpaged: sound nopage get_page
Something noticed when studying use of VM_RESERVED in different drivers:
snd_usX2Y_hwdep_pcm_vm_nopage omitted to get_page: fixed.
And how did this work before? Aargh! That nopage is returning a page from
within a buffer allocated by snd_malloc_pages, which allocates a high-order
page, then does SetPageReserved on each 0-order page within.
That would have worked in 2.6.14, because when the area was unmapped,
PageReserved inhibited put_page. 2.6.15-rc1 removed that inhibition (while
leaving ineffective PageReserveds around for now), but it hasn't caused
trouble because.. we've not been freeing from VM_RESERVED at all.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'sound/usb/usx2y')
| -rw-r--r-- | sound/usb/usx2y/usx2yhwdeppcm.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/usb/usx2y/usx2yhwdeppcm.c b/sound/usb/usx2y/usx2yhwdeppcm.c index 0dc828ff9e94..c9136a98755f 100644 --- a/sound/usb/usx2y/usx2yhwdeppcm.c +++ b/sound/usb/usx2y/usx2yhwdeppcm.c @@ -691,6 +691,7 @@ static struct page * snd_usX2Y_hwdep_pcm_vm_nopage(struct vm_area_struct *area, snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_OOM); vaddr = (char*)((usX2Ydev_t*)area->vm_private_data)->hwdep_pcm_shm + offset; page = virt_to_page(vaddr); + get_page(page); if (type) *type = VM_FAULT_MINOR; |