linux-kernel - [PATCH] uio: fix finding mm index for vma

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Message-ID: <AANLkTim3jJi4ZMZHGztyS==wCJ5C-tLbRe99Qj0YnDe3@mail.gmail.com>
Date:	Sun, 27 Mar 2011 15:58:19 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	linux-kernel@...r.kernel.org
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 <dhillf@...il.com>
---

--- a/drivers/uio/uio.c	2011-01-05 08:50:20.000000000 +0800
+++ b/drivers/uio/uio.c	2011-03-27 14:33:02.000000000 +0800
@@ -587,14 +587,12 @@ static ssize_t uio_write(struct file *fi

 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;
 }
--
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