From: Qipan Li Date: Sat, 21 Sep 2013 01:02:10 +0000 (+0800) Subject: serial: sirf: don't submit dma desc after timeout irqs occur X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=59f8a62c25b9c2a53e7c359ba9ca611639a4c0b0;p=deliverable%2Flinux.git serial: sirf: don't submit dma desc after timeout irqs occur In rx timeout ISR and tasklet, we don't issue new dma desc as rx_done ISR will do that. Signed-off-by: Qipan Li Signed-off-by: Barry Song Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c index 61c1ad03db5b..f186a8fb8887 100644 --- a/drivers/tty/serial/sirfsoc_uart.c +++ b/drivers/tty/serial/sirfsoc_uart.c @@ -529,7 +529,7 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param) while (sirfport->rx_completed != sirfport->rx_issued) { sirfsoc_uart_insert_rx_buf_to_tty(sirfport, SIRFSOC_RX_DMA_BUF_SIZE); - sirfsoc_rx_submit_one_dma_desc(port, sirfport->rx_completed++); + sirfport->rx_completed++; sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT; } count = CIRC_CNT(sirfport->rx_dma_items[sirfport->rx_issued].xmit.head, @@ -706,12 +706,19 @@ static void sirfsoc_uart_rx_dma_complete_tl(unsigned long param) { struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param; struct uart_port *port = &sirfport->port; + struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; + struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; unsigned long flags; spin_lock_irqsave(&sirfport->rx_lock, flags); while (sirfport->rx_completed != sirfport->rx_issued) { sirfsoc_uart_insert_rx_buf_to_tty(sirfport, SIRFSOC_RX_DMA_BUF_SIZE); - sirfsoc_rx_submit_one_dma_desc(port, sirfport->rx_completed++); + if (rd_regl(port, ureg->sirfsoc_int_en_reg) & + uint_en->sirfsoc_rx_timeout_en) + sirfsoc_rx_submit_one_dma_desc(port, + sirfport->rx_completed++); + else + sirfport->rx_completed++; sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT; } spin_unlock_irqrestore(&sirfport->rx_lock, flags);