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Message-Id: <20140604232547.222696051@linuxfoundation.org> Date: Wed, 4 Jun 2014 16:24:35 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Loic Poulain <loic.poulain@...el.com>, Heikki Krogerus <heikki.krogerus@...ux.intel.com> Subject: [PATCH 3.10 012/103] 8250_core: Fix unwanted TX chars write 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Loic Poulain <loic.poulain@...el.com> commit b08c9c317e3f7764a91d522cd031639ba42b98cc upstream. On transmit-hold-register empty, serial8250_tx_chars should be called only if we don't use DMA. DMA has its own tx cycle. Signed-off-by: Loic Poulain <loic.poulain@...el.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/tty/serial/8250/8250_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -1520,7 +1520,7 @@ int serial8250_handle_irq(struct uart_po status = serial8250_rx_chars(up, status); } serial8250_modem_status(up); - if (status & UART_LSR_THRE) + if (!up->dma && (status & UART_LSR_THRE)) serial8250_tx_chars(up); spin_unlock_irqrestore(&port->lock, flags); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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