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From:   Atul Gopinathan <atulgopinathan@gmail.com>
To:     gregkh@linuxfoundation.org
Cc:     abbotti@mev.co.uk, hsweeten@visionengravers.com,
        devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
        Atul Gopinathan <atulgopinathan@gmail.com>
Subject: [PATCH] staging: comedi: cast to (void __user *)
Date:   Thu, 18 Feb 2021 11:58:40 +0530
Message-Id: <20210218062839.32650-1-atulgopinathan@gmail.com>
MIME-Version: 1.0
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Resolve the following sparse warning:
drivers/staging//comedi/comedi_fops.c:2983:41: warning: incorrect type in argument 1 (different address spaces)
drivers/staging//comedi/comedi_fops.c:2983:41:    expected void [noderef] <asn:1> *uptr
drivers/staging//comedi/comedi_fops.c:2983:41:    got unsigned int *chanlist

cmd->chanlist is of type (unsigned int *) as defined in
"struct comedi_cmd" in file drivers/staging/comedi/comedi.h

The function "ptr_to_compat()" expects argument of type
(void __user *) as defined in include/linux/compat.h

Signed-off-by: Atul Gopinathan <atulgopinathan@gmail.com>
---
 drivers/staging/comedi/comedi_fops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index e85a99b68f31..db483cc698fd 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -2980,7 +2980,7 @@ static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32,
 	v32.stop_src = cmd->stop_src;
 	v32.stop_arg = cmd->stop_arg;
 	/* Assume chanlist pointer is unchanged. */
-	v32.chanlist = ptr_to_compat(cmd->chanlist);
+	v32.chanlist = ptr_to_compat((void __user *)cmd->chanlist);
 	v32.chanlist_len = cmd->chanlist_len;
 	v32.data = ptr_to_compat(cmd->data);
 	v32.data_len = cmd->data_len;
-- 
2.27.0