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disp: msm: dsi: Fix potential data race in ctrl isr

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Use atomic operations for shared variables to ensure
safe concurrent access from both ISR and task context.

Change-Id: I02d4bde88692d0be7027b158648a3ab8a5704b2d
Signed-off-by: Gopi Botlagunta <botlagun@qti.qualcomm.com>
This commit is contained in:
Gopi Botlagunta 2026-01-07 15:37:06 +05:30
commit df582cc15a
2 changed files with 8 additions and 7 deletions
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10
msm/dsi/dsi_ctrl.c
View file

@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
*/
#include <linux/of_device.h>
@ -229,10 +229,10 @@ static ssize_t debugfs_line_count_read(struct file *file,
dsi_ctrl->cmd_trigger_frame);
len += scnprintf((buf + len), max_len - len,
"Command successful at line: %04x\n",
dsi_ctrl->cmd_success_line);
atomic_read(&dsi_ctrl->cmd_success_line));
len += scnprintf((buf + len), max_len - len,
"Command successful at frame: %04x\n",
dsi_ctrl->cmd_success_frame);
atomic_read(&dsi_ctrl->cmd_success_frame));
mutex_unlock(&dsi_ctrl->ctrl_lock);
@ -2891,8 +2891,8 @@ static irqreturn_t dsi_ctrl_isr(int irq, void *ptr)
if (dsi_ctrl->enable_cmd_dma_stats) {
u32 reg = dsi_ctrl->hw.ops.log_line_count(&dsi_ctrl->hw,
dsi_ctrl->cmd_mode);
dsi_ctrl->cmd_success_line = (reg & 0xFFFF);
dsi_ctrl->cmd_success_frame = ((reg >> 16) & 0xFFFF);
atomic_set(&dsi_ctrl->cmd_success_line, (reg & 0xFFFF));
atomic_set(&dsi_ctrl->cmd_success_frame, ((reg >> 16) & 0xFFFF));
SDE_EVT32(dsi_ctrl->cell_index, SDE_EVTLOG_FUNC_CASE1,
dsi_ctrl->cmd_success_line,
dsi_ctrl->cmd_success_frame);

5
msm/dsi/dsi_ctrl.h
View file

@ -1,5 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
* Copyright (c) 2015-2020, The Linux Foundation. All rights reserved.
*/
@ -309,8 +310,8 @@ struct dsi_ctrl {
bool cmd_mode;
u32 cmd_trigger_line;
u32 cmd_trigger_frame;
u32 cmd_success_line;
u32 cmd_success_frame;
atomic_t cmd_success_line;
atomic_t cmd_success_frame;
};
/**