X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=drivers%2Fxen%2Fprivcmd.c;h=aa8ca58e6efc551c263297991a95e20ebe070c49;hb=a0c34d225183fd4aca61dccb50e5783fa2f26db1;hp=a250d118144a094a6d124d363499c34404610f98;hpb=91fa58840ae22cbf6d7c505ce6564c4c48f29af3;p=linux-2.6-microblaze.git

diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index a250d118144a..aa8ca58e6efc 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -580,13 +580,13 @@ out_unlock:
 
 static int lock_pages(
 	struct privcmd_dm_op_buf kbufs[], unsigned int num,
-	struct page *pages[], unsigned int nr_pages)
+	struct page *pages[], unsigned int nr_pages, unsigned int *pinned)
 {
 	unsigned int i;
 
 	for (i = 0; i < num; i++) {
 		unsigned int requested;
-		int pinned;
+		int page_count;
 
 		requested = DIV_ROUND_UP(
 			offset_in_page(kbufs[i].uptr) + kbufs[i].size,
@@ -594,14 +594,15 @@ static int lock_pages(
 		if (requested > nr_pages)
 			return -ENOSPC;
 
-		pinned = get_user_pages_fast(
+		page_count = get_user_pages_fast(
 			(unsigned long) kbufs[i].uptr,
 			requested, FOLL_WRITE, pages);
-		if (pinned < 0)
-			return pinned;
+		if (page_count < 0)
+			return page_count;
 
-		nr_pages -= pinned;
-		pages += pinned;
+		*pinned += page_count;
+		nr_pages -= page_count;
+		pages += page_count;
 	}
 
 	return 0;
@@ -611,12 +612,10 @@ static void unlock_pages(struct page *pages[], unsigned int nr_pages)
 {
 	unsigned int i;
 
-	if (!pages)
-		return;
-
 	for (i = 0; i < nr_pages; i++) {
-		if (pages[i])
-			put_page(pages[i]);
+		if (!PageDirty(pages[i]))
+			set_page_dirty_lock(pages[i]);
+		put_page(pages[i]);
 	}
 }
 
@@ -630,6 +629,7 @@ static long privcmd_ioctl_dm_op(struct file *file, void __user *udata)
 	struct xen_dm_op_buf *xbufs = NULL;
 	unsigned int i;
 	long rc;
+	unsigned int pinned = 0;
 
 	if (copy_from_user(&kdata, udata, sizeof(kdata)))
 		return -EFAULT;
@@ -683,9 +683,11 @@ static long privcmd_ioctl_dm_op(struct file *file, void __user *udata)
 		goto out;
 	}
 
-	rc = lock_pages(kbufs, kdata.num, pages, nr_pages);
-	if (rc)
+	rc = lock_pages(kbufs, kdata.num, pages, nr_pages, &pinned);
+	if (rc < 0) {
+		nr_pages = pinned;
 		goto out;
+	}
 
 	for (i = 0; i < kdata.num; i++) {
 		set_xen_guest_handle(xbufs[i].h, kbufs[i].uptr);