Patch "drm/amd/display: use proper context for logging" has been added to the 6.12-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    drm/amd/display: use proper context for logging

to the 6.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-use-proper-context-for-logging.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From 114b42507b6a23d9d24e24e4ef165233332c64d4 Mon Sep 17 00:00:00 2001
From: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Date: Thu, 23 Jul 2026 06:25:48 +0200
Subject: drm/amd/display: use proper context for logging
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Jiri Slaby (SUSE) <jirislaby@kernel.org>

commit 114b42507b6a23d9d24e24e4ef165233332c64d4 upstream.

The same as the rest of the code, get_ss_info_from_atombios() uses
calc_pll_cs->ctx->logger for logging. But calc_pll_cs->ctx is
initialized only later in calc_pll_max_vco_construct(). Therefore, any
output using DC_LOG_SYNC() leads to a NULL pointer deference in
get_ss_info_from_atombios().

According to Sashiko, the very same problem exists in
dce112_get_pix_clk_dividers() and dcn3_get_pix_clk_dividers() too.

To avoid accessing the NULL context, use clk_src->base.ctx->logger
everywhere. That context in base is initialized earlier in
dce110_clk_src_construct() and dce112_clk_src_construct(). Before
get_ss_info_from_atombios() or Sashiko's get_pix_clk_dividers functions
above are actually called. This is done by redefining DC_LOGGER to
CTX->logger.

Before:
dce110_clk_src_construct() did:
 -> sets clk_src->base.ctx = ctx;
 -> ss_info_from_atombios_create()
   -> get_ss_info_from_atombios()   <- uses calc_pll_cs->ctx  # BOOM
 -> calc_pll_max_vco_construct()    <- sets calc_pll_cs->ctx

After:
dce110_clk_src_construct() does:
 -> sets clk_src->base.ctx = ctx;
 -> ss_info_from_atombios_create()
   -> get_ss_info_from_atombios()   <- uses clk_src->base.ctx

Closes: https://bugzilla.suse.com/show_bug.cgi?id=1271175
Closes: https://lore.kernel.org/all/a9ee54e6-2413-4156-9bde-d528ae3c63a3@kernel.org/
Fixes: 1296423bf23c ("drm/amd/display: define DC_LOGGER for logger")
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Lakha, Bhawanpreet <Bhawanpreet.Lakha@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Rodrigo Siqueira <siqueira@igalia.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 6f16fcbb0c46a87e3d9685407e906573d60104b0)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c |   20 ++++++++----------
 1 file changed, 9 insertions(+), 11 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
@@ -45,9 +45,7 @@
 	clk_src->base.ctx
 
 #define DC_LOGGER \
-	calc_pll_cs->ctx->logger
-#define DC_LOGGER_INIT() \
-	struct calc_pll_clock_source *calc_pll_cs = &clk_src->calc_pll
+	CTX->logger
 
 #undef FN
 #define FN(reg_name, field_name) \
@@ -291,6 +289,7 @@ static bool calc_pll_dividers_in_range(
 }
 
 static uint32_t calculate_pixel_clock_pll_dividers(
+		struct dce110_clk_src *clk_src,
 		struct calc_pll_clock_source *calc_pll_cs,
 		struct pll_settings *pll_settings)
 {
@@ -479,7 +478,7 @@ static uint32_t dce110_get_pix_clk_divid
 {
 	uint32_t field = 0;
 	uint32_t pll_calc_error = MAX_PLL_CALC_ERROR;
-	DC_LOGGER_INIT();
+
 	/* Check if reference clock is external (not pcie/xtalin)
 	* HW Dce80 spec:
 	* 00 - PCIE_REFCLK, 01 - XTALIN,    02 - GENERICA,    03 - GENERICB
@@ -522,12 +521,14 @@ static uint32_t dce110_get_pix_clk_divid
 		/*Calculate Dividers by HDMI object, no SS case or SS case */
 		pll_calc_error =
 			calculate_pixel_clock_pll_dividers(
+				        clk_src,
 					&clk_src->calc_pll_hdmi,
 					pll_settings);
 	else
 		/*Calculate Dividers by default object, no SS case or SS case */
 		pll_calc_error =
 			calculate_pixel_clock_pll_dividers(
+					clk_src,
 					&clk_src->calc_pll,
 					pll_settings);
 
@@ -572,7 +573,6 @@ static uint32_t dce110_get_pix_clk_divid
 {
 	struct dce110_clk_src *clk_src = TO_DCE110_CLK_SRC(cs);
 	uint32_t pll_calc_error = MAX_PLL_CALC_ERROR;
-	DC_LOGGER_INIT();
 
 	if (pix_clk_params == NULL || pll_settings == NULL
 			|| pix_clk_params->requested_pix_clk_100hz == 0) {
@@ -604,7 +604,6 @@ static uint32_t dce112_get_pix_clk_divid
 		struct pll_settings *pll_settings)
 {
 	struct dce110_clk_src *clk_src = TO_DCE110_CLK_SRC(cs);
-	DC_LOGGER_INIT();
 
 	if (pix_clk_params == NULL || pll_settings == NULL
 			|| pix_clk_params->requested_pix_clk_100hz == 0) {
@@ -1366,8 +1365,6 @@ static uint32_t dcn3_get_pix_clk_divider
 	unsigned long long actual_pix_clk_100Hz = pix_clk_params ? pix_clk_params->requested_pix_clk_100hz : 0;
 	struct dce110_clk_src *clk_src = TO_DCE110_CLK_SRC(cs);
 
-	DC_LOGGER_INIT();
-
 	if (pix_clk_params == NULL || pll_settings == NULL
 			|| pix_clk_params->requested_pix_clk_100hz == 0) {
 		DC_LOG_ERROR(
@@ -1437,7 +1434,6 @@ static const struct clock_source_funcs d
 	.get_pixel_clk_frequency_100hz = get_pixel_clk_frequency_100hz
 };
 
-
 static void get_ss_info_from_atombios(
 		struct dce110_clk_src *clk_src,
 		enum as_signal_type as_signal,
@@ -1450,7 +1446,7 @@ static void get_ss_info_from_atombios(
 	struct spread_spectrum_info *ss_info_cur;
 	struct spread_spectrum_data *ss_data_cur;
 	uint32_t i;
-	DC_LOGGER_INIT();
+
 	if (ss_entries_num == NULL) {
 		DC_LOG_SYNC(
 			"Invalid entry !!!\n");
@@ -1585,6 +1581,7 @@ static void ss_info_from_atombios_create
 }
 
 static bool calc_pll_max_vco_construct(
+			struct dce110_clk_src *clk_src,
 			struct calc_pll_clock_source *calc_pll_cs,
 			struct calc_pll_clock_source_init_data *init_data)
 {
@@ -1736,6 +1733,7 @@ bool dce110_clk_src_construct(
 	ss_info_from_atombios_create(clk_src);
 
 	if (!calc_pll_max_vco_construct(
+			clk_src,
 			&clk_src->calc_pll,
 			&calc_pll_cs_init_data)) {
 		ASSERT_CRITICAL(false);
@@ -1750,7 +1748,7 @@ bool dce110_clk_src_construct(
 
 
 	if (!calc_pll_max_vco_construct(
-			&clk_src->calc_pll_hdmi, &calc_pll_cs_init_data_hdmi)) {
+			clk_src, &clk_src->calc_pll_hdmi, &calc_pll_cs_init_data_hdmi)) {
 		ASSERT_CRITICAL(false);
 		goto unexpected_failure;
 	}


Patches currently in stable-queue which might be from jirislaby@kernel.org are

queue-6.12/drm-amd-display-use-proper-context-for-logging.patch