linux-kernel - [PATCH 4.19 63/84] media: v4l: cadence: Fix how unsued lanes are handled in csi2rx

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Message-Id: <20200116231721.075335811@linuxfoundation.org>
Date:   Fri, 17 Jan 2020 00:18:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: [PATCH 4.19 63/84] media: v4l: cadence: Fix how unsued lanes are handled in csi2rx_start()

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>

commit 2eca8e4c1df4864b937752c3aa2f7925114f4806 upstream.

The 2nd parameter of 'find_first_zero_bit()' is a number of bits, not of
bytes. So use 'csi2rx->max_lanes' instead of 'sizeof(lanes_used)'.

Fixes: 1fc3b37f34f6 ("media: v4l: cadence: Add Cadence MIPI-CSI2 RX driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/platform/cadence/cdns-csi2rx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -129,7 +129,7 @@ static int csi2rx_start(struct csi2rx_pr
 	 */
 	for (i = csi2rx->num_lanes; i < csi2rx->max_lanes; i++) {
 		unsigned int idx = find_first_zero_bit(&lanes_used,
-						       sizeof(lanes_used));
+						       csi2rx->max_lanes);
 		set_bit(idx, &lanes_used);
 		reg |= CSI2RX_STATIC_CFG_DLANE_MAP(i, i + 1);
 	}