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The msm/dsi host drivers calls drm_helper_hpd_irq_event in the mipi_dsi_host attach/detatch callbacks. mipi_dsi_attach()/mipi_dsi_detach() from a panel/bridge driver could be called from a context where the drm_device's mode_config.mutex is already held, resulting in a deadlock. Queue it as work instead. Signed-off-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Rob Clark <robdclark@gmail.com>