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It wasn't obvious at first this was taking place since the callback sleeps while the caller (a different driver) called it in a threaded IRQ handler. Sakari Ailus (3): mei: vsc: Call wake_up() and event handler in a workqueue mei: vsc: Don't use sleeping condition in wait_event_timeout() mei: vsc: Assign pinfo fields in variable declaration drivers/misc/mei/vsc-tp.c | 64 ++++++++++++++++++++++++--------------- 1 file changed, 40 insertions(+), 24 deletions(-)