linux-kernel - [PATCH 02/15] fpga: dfl: fme: remove copy_to

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Message-Id: <20190628004951.6202-3-mdf@kernel.org>
Date:   Thu, 27 Jun 2019 17:49:38 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     linux-fpga@...r.kernel.org, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Wu Hao <hao.wu@...el.com>, Xu Yilun <yilun.xu@...el.com>,
        Moritz Fischer <mdf@...nel.org>, Alan Tull <atull@...nel.org>
Subject: [PATCH 02/15] fpga: dfl: fme: remove copy_to_user() in ioctl for PR

From: Wu Hao <hao.wu@...el.com>

This patch removes copy_to_user() code in partial reconfiguration
ioctl, as it's useless as user never needs to read the data
structure after ioctl.

Signed-off-by: Xu Yilun <yilun.xu@...el.com>
Signed-off-by: Wu Hao <hao.wu@...el.com>
Acked-by: Moritz Fischer <mdf@...nel.org>
Acked-by: Alan Tull <atull@...nel.org>
Signed-off-by: Moritz Fischer <mdf@...nel.org>
---
 drivers/fpga/dfl-fme-pr.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/fpga/dfl-fme-pr.c b/drivers/fpga/dfl-fme-pr.c
index d9ca9554844a..6ec0f09e5994 100644
--- a/drivers/fpga/dfl-fme-pr.c
+++ b/drivers/fpga/dfl-fme-pr.c
@@ -159,9 +159,6 @@ static int fme_pr(struct platform_device *pdev, unsigned long arg)
 	mutex_unlock(&pdata->lock);
 free_exit:
 	vfree(buf);
-	if (copy_to_user((void __user *)arg, &port_pr, minsz))
-		return -EFAULT;
-
 	return ret;
 }
 
-- 
2.22.0