linux-kernel - [PATCH v2 1/2] staging: comedi: cast function output to assigned variable type

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Message-Id: <20210218084404.16591-1-atulgopinathan@gmail.com>
Date:   Thu, 18 Feb 2021 14:14:03 +0530
From:   Atul Gopinathan <atulgopinathan@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     abbotti@....co.uk, hsweeten@...ionengravers.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Atul Gopinathan <atulgopinathan@...il.com>
Subject: [PATCH v2 1/2] staging: comedi: cast function output to assigned variable type

Fix the following warning generated by sparse:

drivers/staging//comedi/comedi_fops.c:2956:23: warning: incorrect type in assignment (different address spaces)
drivers/staging//comedi/comedi_fops.c:2956:23:    expected unsigned int *chanlist
drivers/staging//comedi/comedi_fops.c:2956:23:    got void [noderef] <asn:1> *

compat_ptr() has a return type of "void __user *"
as defined in "include/linux/compat.h"

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

Signed-off-by: Atul Gopinathan <atulgopinathan@...il.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..fc4ec38012b4 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -2953,7 +2953,7 @@ static int get_compat_cmd(struct comedi_cmd *cmd,
 	cmd->scan_end_arg = v32.scan_end_arg;
 	cmd->stop_src = v32.stop_src;
 	cmd->stop_arg = v32.stop_arg;
-	cmd->chanlist = compat_ptr(v32.chanlist);
+	cmd->chanlist = (unsigned int __force *)compat_ptr(v32.chanlist);
 	cmd->chanlist_len = v32.chanlist_len;
 	cmd->data = compat_ptr(v32.data);
 	cmd->data_len = v32.data_len;
-- 
2.27.0