Messages in this thread Patch in this message | | | Date | Thu, 17 Nov 2005 19:31:36 +0000 (GMT) | From | Hugh Dickins <> | Subject | [PATCH 03/11] 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> ---
sound/usb/usx2y/usx2yhwdeppcm.c | 1 + 1 files changed, 1 insertion(+)
--- unpaged02/sound/usb/usx2y/usx2yhwdeppcm.c 2005-11-12 09:01:30.000000000 +0000 +++ unpaged03/sound/usb/usx2y/usx2yhwdeppcm.c 2005-11-17 15:10:34.000000000 +0000 @@ -691,6 +691,7 @@ static struct page * snd_usX2Y_hwdep_pcm 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; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |