linux-kernel - [PATCH AUTOSEL 4.14 44/95] media: cec: integrate cec_validate_phys

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Date:   Tue,  7 May 2019 01:37:33 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>,
        linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 44/95] media: cec: integrate cec_validate_phys_addr() in cec-api.c

From: Hans Verkuil <hans.verkuil@...co.com>

[ Upstream commit e81bff39489a06384822bb38ce7a59f9e365bbe9 ]

The cec_phys_addr_validate() function will be moved to V4L2,
so use a simplified variant of that function in cec-api.c.
cec now no longer calls cec_phys_addr_validate() and it can
be safely moved to V4L2.

Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Cc: <stable@...r.kernel.org>      # for v4.17 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/media/cec/cec-api.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/media/cec/cec-api.c b/drivers/media/cec/cec-api.c
index a079f7fe018c..21a5f45e0259 100644
--- a/drivers/media/cec/cec-api.c
+++ b/drivers/media/cec/cec-api.c
@@ -113,6 +113,23 @@ static long cec_adap_g_phys_addr(struct cec_adapter *adap,
 	return 0;
 }
 
+static int cec_validate_phys_addr(u16 phys_addr)
+{
+	int i;
+
+	if (phys_addr == CEC_PHYS_ADDR_INVALID)
+		return 0;
+	for (i = 0; i < 16; i += 4)
+		if (phys_addr & (0xf << i))
+			break;
+	if (i == 16)
+		return 0;
+	for (i += 4; i < 16; i += 4)
+		if ((phys_addr & (0xf << i)) == 0)
+			return -EINVAL;
+	return 0;
+}
+
 static long cec_adap_s_phys_addr(struct cec_adapter *adap, struct cec_fh *fh,
 				 bool block, __u16 __user *parg)
 {
@@ -124,7 +141,7 @@ static long cec_adap_s_phys_addr(struct cec_adapter *adap, struct cec_fh *fh,
 	if (copy_from_user(&phys_addr, parg, sizeof(phys_addr)))
 		return -EFAULT;
 
-	err = cec_phys_addr_validate(phys_addr, NULL, NULL);
+	err = cec_validate_phys_addr(phys_addr);
 	if (err)
 		return err;
 	mutex_lock(&adap->lock);
-- 
2.20.1