linux-kernel - [PATCH v4 3/9] drivers/firewire/core-iso.c: Convert to use vm_map_pages

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Message-ID: <20190215024407.GA26389@jordon-HP-15-Notebook-PC>
Date:   Fri, 15 Feb 2019 08:14:07 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     akpm@...ux-foundation.org, willy@...radead.org, mhocko@...e.com,
        stefanr@...6.in-berlin.de, linux@...linux.org.uk,
        robin.murphy@....com
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        linux1394-devel@...ts.sourceforge.net
Subject: [PATCH v4 3/9] drivers/firewire/core-iso.c: Convert to use
 vm_map_pages_zero()

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 <jrdr.linux@...il.com>
---
 drivers/firewire/core-iso.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

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,
-- 
1.9.1