linux-kernel - [PATCH v4 02/15] fpga: dfl: fme: remove copy_to

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Message-Id: <1561610695-5414-3-git-send-email-hao.wu@intel.com>
Date:   Thu, 27 Jun 2019 12:44:42 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linux-api@...r.kernel.org, yilun.xu@...el.com, hao.wu@...el.com,
        gregkh@...uxfoundation.org, atull@...nel.org
Subject: [PATCH v4 02/15] fpga: dfl: fme: remove copy_to_user() in ioctl for PR

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>
---
v2: clean up code split from patch 2 in v1 patchset.
v3: no change.
v4: no change.
---
 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 d9ca955..6ec0f09 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;
 }
 
-- 
1.8.3.1