This is an update to a previous RFC [1], to fix a problem observed by the qemu community that causes serial input to hang when booting a simulated system with data already queued in the UART FIFO [2]. This patch could cause problems for people that are actually relying on chars queued in the PL011 RX FIFO during boot or while the UART is closed. There are no guarantees about such things working in general. In either case, there is no protection against RX FIFO overflow or reprogramming of the UART parameters while Linux is not actively receiving chars. Cheers ---Dave [1] [RFC PATCH v4] tty: pl011: Avoid spuriously stuck-off interrupts http://lists.infradead.org/pipermail/linux-arm-kernel/2018-April/574033.html [2] [Qemu-devel] [Qemu-arm] [PATCH] pl011: do not put into fifo before enabled the interruption https://lists.gnu.org/archive/html/qemu-devel/2018-01/msg06446.html Dave Martin (1): tty: pl011: Avoid spuriously stuck-off interrupts drivers/tty/serial/amba-pl011.c | 10 ++++++++++ 1 file changed, 10 insertions(+) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
