From: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Fri, 18 Feb 2022 10:03:47 +0000 (+0200)
Subject: drm/bridge: Use drm_mode_copy()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d008bc331fb135ea1a5cddc3c4e283ba74596ad2;p=linux.git

drm/bridge: Use drm_mode_copy()

struct drm_display_mode embeds a list head, so overwriting
the full struct with another one will corrupt the list
(if the destination mode is on a list). Use drm_mode_copy()
instead which explicitly preserves the list head of
the destination mode.

Even if we know the destination mode is not on any list
using drm_mode_copy() seems decent as it sets a good
example. Bad examples of not using it might eventually
get copied into code where preserving the list head
actually matters.

Obviously one case not covered here is when the mode
itself is embedded in a larger structure and the whole
structure is copied. But if we are careful when copying
into modes embedded in structures I think we can be a
little more reassured that bogus list heads haven't been
propagated in.

@is_mode_copy@
@@
drm_mode_copy(...)
{
...
}

@depends on !is_mode_copy@
struct drm_display_mode *mode;
expression E, S;
@@
(
- *mode = E
+ drm_mode_copy(mode, &E)
|
- memcpy(mode, E, S)
+ drm_mode_copy(mode, E)
)

@depends on !is_mode_copy@
struct drm_display_mode mode;
expression E;
@@
(
- mode = E
+ drm_mode_copy(&mode, &E)
|
- memcpy(&mode, E, S)
+ drm_mode_copy(&mode, E)
)

@@
struct drm_display_mode *mode;
@@
- &*mode
+ mode

Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220218100403.7028-7-ville.syrjala@linux.intel.com
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---

diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index 14c763e1fa6fa..e34fb09b90b9c 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -855,7 +855,7 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
 	/* Save the new desired phy config */
 	memcpy(&dsi->phy_cfg, &new_cfg, sizeof(new_cfg));
 
-	memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
+	drm_mode_copy(&dsi->mode, adjusted_mode);
 	drm_mode_debug_printmodeline(adjusted_mode);
 
 	if (pm_runtime_resume_and_get(dev) < 0)
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 4befc104d2200..a563460f8d209 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2830,7 +2830,7 @@ static void dw_hdmi_bridge_mode_set(struct drm_bridge *bridge,
 	mutex_lock(&hdmi->mutex);
 
 	/* Store the display mode for plugin/DKMS poweron events */
-	memcpy(&hdmi->previous_mode, mode, sizeof(hdmi->previous_mode));
+	drm_mode_copy(&hdmi->previous_mode, mode);
 
 	mutex_unlock(&hdmi->mutex);
 }
diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index c23e0abc65e8f..7f9574b17caa4 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1312,7 +1312,7 @@ static void tc_bridge_mode_set(struct drm_bridge *bridge,
 {
 	struct tc_data *tc = bridge_to_tc(bridge);
 
-	tc->mode = *mode;
+	drm_mode_copy(&tc->mode, mode);
 }
 
 static struct edid *tc_get_edid(struct drm_bridge *bridge,