[PATCH 0/4] drm/omap: minor fixes

[PATCH 0/4] drm/omap: minor fixes

[Tomi Valkeinen]

Hi,

This series has some minor fixes found by a static analysis tool, and one for
missing linefeeds.  As far as I know, we have never hit any of those errors.

 Tomi

Tomi Valkeinen (4):
  drm/omap: check return value from soc_device_match
  drm/omap: handle error if scale coefs are not found
  drm/omap: add missing linefeeds to prints
  drm/omap: handle alloc failures in omap_connector

 drivers/gpu/drm/omapdrm/dss/dispc.c      | 20 +++++++++++++-------
 drivers/gpu/drm/omapdrm/dss/hdmi4_core.c |  7 ++++++-
 drivers/gpu/drm/omapdrm/omap_connector.c | 10 ++++++++++
 3 files changed, 29 insertions(+), 8 deletions(-)

-- 
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[PATCH 1/4] drm/omap: check return value from soc_device_match

[Tomi Valkeinen]

soc_device_match() can return NULL, so add a check and fail if
soc_device_match() fails.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/gpu/drm/omapdrm/dss/hdmi4_core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c b/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
index 35ed2add6189..813ba42f2753 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
@@ -922,8 +922,13 @@ int hdmi4_core_init(struct platform_device *pdev, struct hdmi_core_data *core)
 {
 	const struct hdmi4_features *features;
 	struct resource *res;
+	const struct soc_device_attribute *soc;
 
-	features = soc_device_match(hdmi4_soc_devices)->data;
+	soc = soc_device_match(hdmi4_soc_devices);
+	if (!soc)
+		return -ENODEV;
+
+	features = soc->data;
 	core->cts_swmode = features->cts_swmode;
 	core->audio_use_mclk = features->audio_use_mclk;
 
-- 
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[PATCH 2/4] drm/omap: handle error if scale coefs are not found

[Tomi Valkeinen]

If get_scale_coef functions fail, they return NULL, but we never check
the return value and could do a NULL deref. This should not happen as we
ought to validate the amount of scaling already earlier, but to be safe,
add the necessary check.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/gpu/drm/omapdrm/dss/dispc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/omapdrm/dss/dispc.c b/drivers/gpu/drm/omapdrm/dss/dispc.c
index 5e2e65e88847..b8fdb63e5bb3 100644
--- a/drivers/gpu/drm/omapdrm/dss/dispc.c
+++ b/drivers/gpu/drm/omapdrm/dss/dispc.c
@@ -828,6 +828,12 @@ static void dispc_ovl_set_scale_coef(struct dispc_device *dispc,
 	h_coef = dispc_ovl_get_scale_coef(fir_hinc, true);
 	v_coef = dispc_ovl_get_scale_coef(fir_vinc, five_taps);
 
+	if (!h_coef || !v_coef) {
+		dev_err(&dispc->pdev->dev, "%s: failed to find scale coefs\n",
+			__func__);
+		return;
+	}
+
 	for (i = 0; i < 8; i++) {
 		u32 h, hv;
 
-- 
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[PATCH 3/4] drm/omap: add missing linefeeds to prints

[Tomi Valkeinen]

A bunch of debug and error prints are missing linefeeds. Add those.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/gpu/drm/omapdrm/dss/dispc.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dispc.c b/drivers/gpu/drm/omapdrm/dss/dispc.c
index b8fdb63e5bb3..7f3ac6b13b56 100644
--- a/drivers/gpu/drm/omapdrm/dss/dispc.c
+++ b/drivers/gpu/drm/omapdrm/dss/dispc.c
@@ -2348,7 +2348,7 @@ static int dispc_ovl_calc_scaling_24xx(struct dispc_device *dispc,
 	}
 
 	if (in_width > maxsinglelinewidth) {
-		DSSERR("Cannot scale max input width exceeded");
+		DSSERR("Cannot scale max input width exceeded\n");
 		return -EINVAL;
 	}
 	return 0;
@@ -2430,13 +2430,13 @@ static int dispc_ovl_calc_scaling_34xx(struct dispc_device *dispc,
 	}
 
 	if (in_width > (maxsinglelinewidth * 2)) {
-		DSSERR("Cannot setup scaling");
-		DSSERR("width exceeds maximum width possible");
+		DSSERR("Cannot setup scaling\n");
+		DSSERR("width exceeds maximum width possible\n");
 		return -EINVAL;
 	}
 
 	if (in_width > maxsinglelinewidth && *five_taps) {
-		DSSERR("cannot setup scaling with five taps");
+		DSSERR("cannot setup scaling with five taps\n");
 		return -EINVAL;
 	}
 	return 0;
@@ -2478,7 +2478,7 @@ static int dispc_ovl_calc_scaling_44xx(struct dispc_device *dispc,
 			in_width > maxsinglelinewidth && ++*decim_x);
 
 	if (in_width > maxsinglelinewidth) {
-		DSSERR("Cannot scale width exceeds max line width");
+		DSSERR("Cannot scale width exceeds max line width\n");
 		return -EINVAL;
 	}
 
@@ -2496,7 +2496,7 @@ static int dispc_ovl_calc_scaling_44xx(struct dispc_device *dispc,
 		 * bandwidth. Despite what theory says this appears to
 		 * be true also for 16-bit color formats.
 		 */
-		DSSERR("Not enough bandwidth, too much downscaling (x-decimation factor %d > 4)", *decim_x);
+		DSSERR("Not enough bandwidth, too much downscaling (x-decimation factor %d > 4)\n", *decim_x);
 
 		return -EINVAL;
 	}
@@ -4639,7 +4639,7 @@ static int dispc_errata_i734_wa_init(struct dispc_device *dispc)
 						i734_buf.size, &i734_buf.paddr,
 						GFP_KERNEL);
 	if (!i734_buf.vaddr) {
-		dev_err(&dispc->pdev->dev, "%s: dma_alloc_writecombine failed",
+		dev_err(&dispc->pdev->dev, "%s: dma_alloc_writecombine failed\n",
 			__func__);
 		return -ENOMEM;
 	}
-- 
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[PATCH 4/4] drm/omap: handle alloc failures in omap_connector

[Tomi Valkeinen]

Handle memory allocation failures in omap_connector to avoid NULL
derefs.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/gpu/drm/omapdrm/omap_connector.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/omapdrm/omap_connector.c b/drivers/gpu/drm/omapdrm/omap_connector.c
index a0d7b1d905e8..5cde26ac937b 100644
--- a/drivers/gpu/drm/omapdrm/omap_connector.c
+++ b/drivers/gpu/drm/omapdrm/omap_connector.c
@@ -121,6 +121,9 @@ static int omap_connector_get_modes(struct drm_connector *connector)
 	if (dssdrv->read_edid) {
 		void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
 
+		if (!edid)
+			return 0;
+
 		if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 				drm_edid_is_valid(edid)) {
 			drm_mode_connector_update_edid_property(
@@ -139,6 +142,9 @@ static int omap_connector_get_modes(struct drm_connector *connector)
 		struct drm_display_mode *mode = drm_mode_create(dev);
 		struct videomode vm = {0};
 
+		if (!mode)
+			return 0;
+
 		dssdrv->get_timings(dssdev, &vm);
 
 		drm_display_mode_from_videomode(&vm, mode);
@@ -200,6 +206,10 @@ static int omap_connector_mode_valid(struct drm_connector *connector,
 	if (!r) {
 		/* check if vrefresh is still valid */
 		new_mode = drm_mode_duplicate(dev, mode);
+
+		if (!new_mode)
+			return MODE_BAD;
+
 		new_mode->clock = vm.pixelclock / 1000;
 		new_mode->vrefresh = 0;
 		if (mode->vrefresh == drm_mode_vrefresh(new_mode))
-- 
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Re: [PATCH 0/4] drm/omap: minor fixes

[Peter Ujfalusi]

On 2018-05-02 12:11, Tomi Valkeinen wrote:
> Hi,
> 
> This series has some minor fixes found by a static analysis tool, and one for
> missing linefeeds.  As far as I know, we have never hit any of those errors.

To all:
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

> 
>  Tomi
> 
> Tomi Valkeinen (4):
>   drm/omap: check return value from soc_device_match
>   drm/omap: handle error if scale coefs are not found
>   drm/omap: add missing linefeeds to prints
>   drm/omap: handle alloc failures in omap_connector
> 
>  drivers/gpu/drm/omapdrm/dss/dispc.c      | 20 +++++++++++++-------
>  drivers/gpu/drm/omapdrm/dss/hdmi4_core.c |  7 ++++++-
>  drivers/gpu/drm/omapdrm/omap_connector.c | 10 ++++++++++
>  3 files changed, 29 insertions(+), 8 deletions(-)
> 

- Péter

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Re: [PATCH 0/4] drm/omap: minor fixes

[Benoit Parrot]

For the series,

Reviewed-by: Benoit Parrot <bparrot@ti.com>

Tomi Valkeinen <tomi.valkeinen@ti.com> wrote on Wed [2018-May-02 12:11:55 +0300]:
> Hi,
> 
> This series has some minor fixes found by a static analysis tool, and one for
> missing linefeeds.  As far as I know, we have never hit any of those errors.
> 
>  Tomi
> 
> Tomi Valkeinen (4):
>   drm/omap: check return value from soc_device_match
>   drm/omap: handle error if scale coefs are not found
>   drm/omap: add missing linefeeds to prints
>   drm/omap: handle alloc failures in omap_connector
> 
>  drivers/gpu/drm/omapdrm/dss/dispc.c      | 20 +++++++++++++-------
>  drivers/gpu/drm/omapdrm/dss/hdmi4_core.c |  7 ++++++-
>  drivers/gpu/drm/omapdrm/omap_connector.c | 10 ++++++++++
>  3 files changed, 29 insertions(+), 8 deletions(-)
> 
> -- 
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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