Hello Yakir Yang,
The patch 7b4b7a8db439: "drm: bridge: analogix/dp: Fix the possible dead lock in bridge disable time" from Feb 15, 2016, leads to the following static checker warning:
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c:875 analogix_dp_irq_thread() warn: bitwise AND condition is false here
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c 869 static irqreturn_t analogix_dp_irq_thread(int irq, void *arg) 870 { 871 struct analogix_dp_device *dp = arg; 872 enum dp_irq_type irq_type; 873 874 irq_type = analogix_dp_get_irq_type(dp); 875 if (irq_type & DP_IRQ_TYPE_HP_CABLE_IN || ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This is never true. Maybe test_bit() for these?
876 irq_type & DP_IRQ_TYPE_HP_CABLE_OUT) { 877 dev_dbg(dp->dev, "Detected cable status changed!\n"); 878 if (dp->drm_dev) 879 drm_helper_hpd_irq_event(dp->drm_dev); 880 } 881 882 if (irq_type != DP_IRQ_TYPE_UNKNOWN) { 883 analogix_dp_clear_hotplug_interrupts(dp); 884 analogix_dp_unmute_hpd_interrupt(dp); 885 } 886 887 return IRQ_HANDLED; 888 }
regards, dan carpenter