From f0c554fddd3be561542cd37acdb3adc9ec5483ee Mon Sep 17 00:00:00 2001 From: Hillf Danton Date: Mon, 28 Mar 2011 23:33:26 +0200 Subject: [PATCH] uio: fix finding mm index for vma When finding mm index for vma it looks more flexible that the mm could be sparse, and both the size of mm and the pgoff of vma could give correct selection. Signed-off-by: Hillf Danton Signed-off-by: Hans J. Koch Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 51fe1795d5a8..10a029b24159 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -587,14 +587,12 @@ static ssize_t uio_write(struct file *filep, const char __user *buf, static int uio_find_mem_index(struct vm_area_struct *vma) { - int mi; struct uio_device *idev = vma->vm_private_data; - for (mi = 0; mi < MAX_UIO_MAPS; mi++) { - if (idev->info->mem[mi].size == 0) + if (vma->vm_pgoff < MAX_UIO_MAPS) { + if (idev->info->mem[vma->vm_pgoff].size == 0) return -1; - if (vma->vm_pgoff == mi) - return mi; + return (int)vma->vm_pgoff; } return -1; } -- 2.20.1