[PATCH linux dev-4.10 v4 20/31] drivers: fsi: occ: Remove early user buffer checking

[Eddie James]

From: "Edward A. James" <eajames at us.ibm.com>

We check user buffer access when we copy the data in read()/write()
anyway.

Signed-off-by: Edward A. James <eajames at us.ibm.com>
Reviewed-by: Andrew Jeffery <andrew at aj.id.au>
---
 drivers/fsi/occ.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/drivers/fsi/occ.c b/drivers/fsi/occ.c
index 322af5a..7e2b770 100644
--- a/drivers/fsi/occ.c
+++ b/drivers/fsi/occ.c
@@ -252,12 +252,6 @@ static ssize_t occ_read(struct file *file, char __user *buf, size_t len,
 {
 	struct occ_client *client = file->private_data;
 
-	/* check this ahead of time so we don't go changing the xfr state
-	 * needlessly
-	 */
-	if (!access_ok(VERIFY_WRITE, buf, len))
-		return -EFAULT;
-
 	return occ_read_common(client, buf, NULL, len);
 }
 
@@ -326,12 +320,6 @@ static ssize_t occ_write(struct file *file, const char __user *buf,
 {
 	struct occ_client *client = file->private_data;
 
-	/* check this ahead of time so we don't go changing the xfr state
-	 * needlessly
-	 */
-	if (!access_ok(VERIFY_READ, buf, len))
-		return -EFAULT;
-
 	return occ_write_common(client, buf, NULL, len);
 }
 
-- 
1.8.3.1