[PATCH 3/3] staging: comedi: add __user tag to chanlist

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This reverts "staging: comedi: comedi.h: remove __user tag from
chanlist" by H Hartley Sweeten on 2012-09-18 (committed by Greg
Kroah-Hartman on Wed Sep 19 09:36:44 2012 +0100), and also removes a
couple of `__user` casts that are now unnecessary and a couple of
`__force` casts that are now wrong.

The `chanlist` member of `struct comedi_cmd` is used by the `COMEDI_CMD`
and `COMEDI_CMDTEST` ioctls where it points to a channel list in user
memory (but it may be `NULL` for the `COMEDI_CMDTEST` ioctl).
Previously, the `chanlist` member pointed to a kernel copy of the
channel list in other contexts, but that is no longer the case.

Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
---
v2: Reordered patch sequence.  Combined original patches 1 and 2 to
    avoid introducing sparse warnings.
---
 drivers/staging/comedi/comedi.h      | 2 +-
 drivers/staging/comedi/comedi_fops.c | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/comedi/comedi.h b/drivers/staging/comedi/comedi.h
index 133f013..76cdb2c 100644
--- a/drivers/staging/comedi/comedi.h
+++ b/drivers/staging/comedi/comedi.h
@@ -365,7 +365,7 @@ struct comedi_cmd {
 	unsigned int stop_src;
 	unsigned int stop_arg;
 
-	unsigned int *chanlist;	/* channel/range list */
+	unsigned int __user *chanlist;	/* channel/range list */
 	unsigned int chanlist_len;
 
 	short __user *data; /* data list, size depends on subd flags */
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 41dbe68..9433aae 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1145,7 +1145,7 @@ static int do_cmd_ioctl(struct comedi_device *dev,
 		return -EFAULT;
 	}
 	/* save user's chanlist pointer so it can be restored later */
-	user_chanlist = (unsigned int __user *)cmd.chanlist;
+	user_chanlist = cmd.chanlist;
 
 	if (cmd.subdev >= dev->n_subdevices) {
 		DPRINTK("%d no such subdevice\n", cmd.subdev);
@@ -1229,7 +1229,7 @@ static int do_cmd_ioctl(struct comedi_device *dev,
 		DPRINTK("test returned %d\n", ret);
 		cmd = async->cmd;
 		/* restore chanlist pointer before copying back */
-		cmd.chanlist = (unsigned int __force *)user_chanlist;
+		cmd.chanlist = user_chanlist;
 		cmd.data = NULL;
 		if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
 			DPRINTK("fault writing cmd\n");
@@ -1295,7 +1295,7 @@ static int do_cmdtest_ioctl(struct comedi_device *dev,
 		return -EFAULT;
 	}
 	/* save user's chanlist pointer so it can be restored later */
-	user_chanlist = (unsigned int __user *)cmd.chanlist;
+	user_chanlist = cmd.chanlist;
 
 	if (cmd.subdev >= dev->n_subdevices) {
 		DPRINTK("%d no such subdevice\n", cmd.subdev);
@@ -1351,7 +1351,7 @@ static int do_cmdtest_ioctl(struct comedi_device *dev,
 	ret = s->do_cmdtest(dev, s, &cmd, chanlist);
 
 	/* restore chanlist pointer before copying back */
-	cmd.chanlist = (unsigned int __force *)user_chanlist;
+	cmd.chanlist = user_chanlist;
 	if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
 		DPRINTK("bad cmd address\n");
 		ret = -EFAULT;
-- 
1.7.12

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