[v2,19/34] fsl_hypervisor: convert put_page() to put_user_page*()
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Message ID 20190804224915.28669-20-jhubbard@nvidia.com
State New
Headers show
Series
  • put_user_pages(): miscellaneous call sites
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Commit Message

john.hubbard@gmail.com Aug. 4, 2019, 10:49 p.m. UTC
From: John Hubbard <jhubbard@nvidia.com>

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").

This changes the release code slightly, because each page slot in the
page_list[] array is no longer checked for NULL. However, that check
was wrong anyway, because the get_user_pages() pattern of usage here
never allowed for NULL entries within a range of pinned pages.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kees Cook <keescook@chromium.org>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 drivers/virt/fsl_hypervisor.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

Patch
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diff --git a/drivers/virt/fsl_hypervisor.c b/drivers/virt/fsl_hypervisor.c
index 93d5bebf9572..a8f78d572c45 100644
--- a/drivers/virt/fsl_hypervisor.c
+++ b/drivers/virt/fsl_hypervisor.c
@@ -292,11 +292,8 @@  static long ioctl_memcpy(struct fsl_hv_ioctl_memcpy __user *p)
 		virt_to_phys(sg_list), num_pages);
 
 exit:
-	if (pages) {
-		for (i = 0; i < num_pages; i++)
-			if (pages[i])
-				put_page(pages[i]);
-	}
+	if (pages)
+		put_user_pages(pages, num_pages);
 
 	kfree(sg_list_unaligned);
 	kfree(pages);