serial: mvebu-uart: free the IRQ in ->shutdown()

2016-08-16T07:33:20Z

commit c2c1659b4f8f9e19fe82a4fd06cca4b3d59090ce upstream. As suggested by the serial port infrastructure documentation, the IRQ is requested in ->startup(). However, it is never freed in the ->shutdown() hook. With simple systems that open the serial port once for all and always have at least one process that keep the serial port opened, there was no problem. But with a more complicated system (*cough* systemd *cough*), the serial port is opened/closed many times, which at some point no processes having the serial port open at all. Due to this ->startup() gets called again, tries to request_irq() again, which fails. Fixes: 30530791a7a0 ("serial: mvebu-uart: initial support for Armada-3700 serial port") Cc: Ofer Heifetz Signed-off-by: Thomas Petazzoni Signed-off-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman

serial: mvebu-uart: initial support for Armada-3700 serial port

2016-03-08T00:11:14Z

Armada-3700's uart is a simple serial port, which doesn't support. Configuring the modem control lines. The uart port has a 32 bytes Tx FIFO and a 64 bytes Rx FIFO The uart driver implements the uart core operations. It also support the system (early) console based on Armada-3700's serial port. Known Issue: The uart driver currently doesn't support clock programming, which means the baud-rate stays with the default value configured by the bootloader at boot time [gregory.clement@free-electrons.com: Rewrite many part which are too long to enumerate] Signed-off-by: Wilson Ding Signed-off-by: Nadav Haklai Signed-off-by: Gregory CLEMENT Acked-by: Rob Herring Signed-off-by: Greg Kroah-Hartman

kernel/drivers/tty/serial/mvebu-uart.c, branch linux-4.6.y

serial: mvebu-uart: free the IRQ in ->shutdown()

serial: mvebu-uart: initial support for Armada-3700 serial port