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drm/msm/dp: fix runtime PM leak on connect failure 

commit e86750b01a upstream.

Make sure to balance the runtime PM usage counter (and suspend) before
returning on connect failures (e.g. DPCD read failures after a spurious
connect event or if link training fails).

Fixes: 5814b8bf08 ("drm/msm/dp: incorporate pm_runtime framework into DP driver")
Cc: stable@vger.kernel.org      # 6.8
Cc: Kuogee Hsieh <quic_khsieh@quicinc.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/582746/
Link: https://lore.kernel.org/r/20240313164306.23133-3-johan+linaro@kernel.org
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2024-03-13 17:43:06 +01:00 committed by Greg Kroah-Hartman
parent 416558ca97
commit 2ce20f2d43
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/msm/dp/dp_display.c
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@ -598,6 +598,7 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
ret = dp_display_usbpd_configure_cb(&pdev->dev);
if (ret) { /* link train failed */
dp->hpd_state = ST_DISCONNECTED;
pm_runtime_put_sync(&pdev->dev);
} else {
dp->hpd_state = ST_MAINLINK_READY;
}