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SubjectRe: [PATCH 03/16] tty: serial: 8250_core: read only RX if there is something in the FIFO
On 02/10/2015 12:34 AM, Peter Hurley wrote:
> The "too much work" message means serial8250_handle_irq() is returning 0,
> ie., not handled. Which in turn means IIR indicates no interrupt is pending
> (UART_IIR_NO_INT == 1).

The OMAP UART for instance have two possible TX-IRQ handling. The
default is to fire the interrupt once there is room for at least one
byte in the FIFO. I set the OMAP_UART_SCR_TX_EMPTY bit to get the same
behavior as the 8250 driver expects (interrupt while the FIFO is empty).
Without this bit set I've seen the message from time to time.


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