If DMA is active during a shutdown, a delayed restore of the registers may be pending. The restore must be performed after the DMA is stopped, otherwise the delayed restore remains pending and will fire upon the first DMA TX complete of a totally different serial session.
Signed-off-by: John Ogness <[email protected]> --- drivers/tty/serial/8250/8250_omap.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 5b39892..25f6255 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -657,9 +657,15 @@ static void omap_8250_shutdown(struct uart_port *port) up->ier = 0; serial_out(up, UART_IER, 0); - if (up->dma) + if (up->dma) { serial8250_release_dma(up); + if (priv->delayed_restore) { + priv->delayed_restore = 0; + omap8250_restore_regs(up); + } + } + /* * Disable break condition and FIFOs */ -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
