evie/android_kernel_oneplus_msm8998
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msm: mdss: fix deadlock between display and dsi status check thread

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The vsync handler in display thread holds ov_lock followed by
offlock. And the DSI status check thread for cmd mode panel holds
offlock followed by ovlock, causing a clear deadlock scenario.
Fix it by acquiring ov_lock before offlock in DSI status check
thread.

Change-Id: I54ef54b5ca7e4c87e909c510b28ff7770bb20a3b
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>
This commit is contained in:
Veera Sundaram Sankaran 2015-12-08 16:57:02 -08:00 • committed by David Keitel
parent 9732bbbbd3
commit e22c8ccbee
1 changed files with 3 additions and 3 deletions
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6
drivers/video/fbdev/msm/dsi_status_6g.c
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@ -126,15 +126,15 @@ void mdss_check_dsi_ctrl_status(struct work_struct *work, uint32_t interval)
*/
mutex_lock(&ctrl_pdata->mutex);
mutex_lock(&ctl->offlock);
if (mipi->mode == DSI_CMD_MODE)
mutex_lock(&mdp5_data->ov_lock);
mutex_lock(&ctl->offlock);
if (mdss_panel_is_power_off(pstatus_data->mfd->panel_power_state) ||
pstatus_data->mfd->shutdown_pending) {
mutex_unlock(&ctl->offlock);
if (mipi->mode == DSI_CMD_MODE)
mutex_unlock(&mdp5_data->ov_lock);
mutex_unlock(&ctl->offlock);
mutex_unlock(&ctrl_pdata->mutex);
pr_err("%s: DSI turning off, avoiding panel status check\n",
__func__);
@ -160,9 +160,9 @@ void mdss_check_dsi_ctrl_status(struct work_struct *work, uint32_t interval)
ret = ctrl_pdata->check_status(ctrl_pdata);
mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_OFF);
mutex_unlock(&ctl->offlock);
if (mipi->mode == DSI_CMD_MODE)
mutex_unlock(&mdp5_data->ov_lock);
mutex_unlock(&ctl->offlock);
mutex_unlock(&ctrl_pdata->mutex);
if ((pstatus_data->mfd->panel_power_state == MDSS_PANEL_POWER_ON)) {