linux-kernel - [PATCH 2/2] media: qcom: camss: Fix overflows in clock rate calculations

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Message-Id: <20210214213404.8373-3-andrey.konovalov@linaro.org>
Date:   Mon, 15 Feb 2021 00:34:04 +0300
From:   Andrey Konovalov <andrey.konovalov@...aro.org>
To:     junak.pub@...il.com, robert.foss@...aro.org,
        sakari.ailus@...ux.intel.com
Cc:     todor.too@...il.com, agross@...nel.org, bjorn.andersson@...aro.org,
        mchehab@...nel.org, laurent.pinchart@...asonboard.com,
        jacopo@...ndi.org, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andrey Konovalov <andrey.konovalov@...aro.org>
Subject: [PATCH 2/2] media: qcom: camss: Fix overflows in clock rate calculations

From: Vladimir Lypak <junak.pub@...il.com>

Because of u32 type being used to store pixel clock rate, expression used
to calculate pipeline clocks (pixel_clock * bpp) produces wrong value due
to integer overflow. This patch changes data type used to store, pass and
retrieve pixel_clock from u32 to u64 to make this mistake less likely to
be repeated in the future.

Signed-off-by: Vladimir Lypak <junak.pub@...il.com>
Acked-by: Robert Foss <robert.foss@...aro.org>
Signed-off-by: Andrey Konovalov <andrey.konovalov@...aro.org>
---
 drivers/media/platform/qcom/camss/camss-vfe.c | 4 ++--
 drivers/media/platform/qcom/camss/camss.c     | 2 +-
 drivers/media/platform/qcom/camss/camss.h     | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
index fae2b513b2f9..b2c95b46ce66 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe.c
@@ -1112,7 +1112,7 @@ static inline void vfe_isr_halt_ack(struct vfe_device *vfe)
 static int vfe_set_clock_rates(struct vfe_device *vfe)
 {
 	struct device *dev = vfe->camss->dev;
-	u32 pixel_clock[MSM_VFE_LINE_NUM];
+	u64 pixel_clock[MSM_VFE_LINE_NUM];
 	int i, j;
 	int ret;
 
@@ -1194,7 +1194,7 @@ static int vfe_set_clock_rates(struct vfe_device *vfe)
  */
 static int vfe_check_clock_rates(struct vfe_device *vfe)
 {
-	u32 pixel_clock[MSM_VFE_LINE_NUM];
+	u64 pixel_clock[MSM_VFE_LINE_NUM];
 	int i, j;
 	int ret;
 
diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c
index 2888c7ef2303..ea17f5997dc6 100644
--- a/drivers/media/platform/qcom/camss/camss.c
+++ b/drivers/media/platform/qcom/camss/camss.c
@@ -578,7 +578,7 @@ s64 camss_get_link_freq(struct media_entity *entity, unsigned int bpp,
  *
  * Return 0 on success or a negative error code otherwise
  */
-int camss_get_pixel_clock(struct media_entity *entity, u32 *pixel_clock)
+int camss_get_pixel_clock(struct media_entity *entity, u64 *pixel_clock)
 {
 	struct media_entity *sensor;
 	struct v4l2_subdev *subdev;
diff --git a/drivers/media/platform/qcom/camss/camss.h b/drivers/media/platform/qcom/camss/camss.h
index 86cdc25189eb..e29466d07ad2 100644
--- a/drivers/media/platform/qcom/camss/camss.h
+++ b/drivers/media/platform/qcom/camss/camss.h
@@ -110,7 +110,7 @@ void camss_disable_clocks(int nclocks, struct camss_clock *clock);
 struct media_entity *camss_find_sensor(struct media_entity *entity);
 s64 camss_get_link_freq(struct media_entity *entity, unsigned int bpp,
 			unsigned int lanes);
-int camss_get_pixel_clock(struct media_entity *entity, u32 *pixel_clock);
+int camss_get_pixel_clock(struct media_entity *entity, u64 *pixel_clock);
 int camss_pm_domain_on(struct camss *camss, int id);
 void camss_pm_domain_off(struct camss *camss, int id);
 void camss_delete(struct camss *camss);
-- 
2.17.1