amba-pl011​/dma: Add check for the residue in DMA callback

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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>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Chanho Min 2012-02-20 10:24:40 +09:00 • committed by Greg Kroah-Hartman

parent b26469a8b1

commit 6dc01aa653

1 changed files with 16 additions and 1 deletions

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drivers/tty/serial/amba-pl011.c

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