[RESEND,v4,3/9] drivers/firewire/core-iso.c: Convert to use vm_map_pages_zero()

Commit Message

Souptick Joarder March 19, 2019, 2:25 a.m. UTC

Convert to use vm_map_pages_zero() to map range of kernel memory
to user vma.

This driver has ignored vm_pgoff and mapped the entire pages. We
could later "fix" these drivers to behave according to the normal
vm_pgoff offsetting simply by removing the _zero suffix on the
function name and if that causes regressions, it gives us an easy
way to revert.

Signed-off-by: Souptick Joarder <[e-mail]>
---
 drivers/firewire/core-iso.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

Patch

diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index 35e784c..5414eb1 100644
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -107,19 +107,8 @@  int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
 int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
 			  struct vm_area_struct *vma)
 {
-	unsigned long uaddr;
-	int i, err;
-
-	uaddr = vma->vm_start;
-	for (i = 0; i < buffer->page_count; i++) {
-		err = vm_insert_page(vma, uaddr, buffer->pages[i]);
-		if (err)
-			return err;
-
-		uaddr += PAGE_SIZE;
-	}
-
-	return 0;
+	return vm_map_pages_zero(vma, buffer->pages,
+					buffer->page_count);
 }
 
 void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,