On Mon, Feb 20, 2012 at 2:24 AM, Chanho Min [off-list ref] wrote:

In DMA-operated uart, I found that rx data can be taken by the UART
interrupts during the DMA irq handler. pl011_int is occurred just
before it goes inside spin_lock_irq. When it returns to the callback,
DMA buffer already has been flushed. Then, pl011_dma_rx_chars gets
invalid data. So I add check for the residue as the patch bellow.

Signed-off-by: Chanho Min <chanho.min@lge.com>

Looks correct!
Acked-by: Linus Walleij <redacted>

Thanks,
Linus Walleij