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serial: sh-sci: Handle DMA init failures inside sci_request_dma()

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Let sci_request_dma() handle failures to initialize DMA itself.
This way sci_tx_dma_release() and sci_rx_dma_release() don't have to
consider partial initialization, and thus don't need to reset DMA
addresses to DMA_ERROR_CODE, which is not 100% portable access
architectures.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2015-08-21 20:02:39 +02:00 committed by Greg Kroah-Hartman
parent f5835c1d0e
commit b925802026
1 changed files with 7 additions and 5 deletions
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12
drivers/tty/serial/sh-sci.c
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@ -1371,9 +1371,8 @@ static void sci_rx_dma_release(struct sci_port *s, bool enable_pio)
s->chan_rx = NULL;
s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL;
dma_release_channel(chan);
if (sg_dma_address(&s->sg_rx[0]))
dma_free_coherent(port->dev, s->buf_len_rx * 2,
sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0]));
dma_free_coherent(port->dev, s->buf_len_rx * 2,
sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0]));
if (enable_pio)
sci_start_rx(port);
}
@ -1709,7 +1708,8 @@ static void sci_request_dma(struct uart_port *port)
nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE);
if (!nent) {
dev_warn(port->dev, "Failed mapping Tx DMA descriptor\n");
sci_tx_dma_release(s, false);
dma_release_channel(chan);
s->chan_tx = NULL;
} else {
dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n",
__func__,
@ -1743,7 +1743,9 @@ static void sci_request_dma(struct uart_port *port)
if (!buf[0]) {
dev_warn(port->dev,
"Failed to allocate Rx dma buffer, using PIO\n");
sci_rx_dma_release(s, true);
dma_release_channel(chan);
s->chan_rx = NULL;
sci_start_rx(port);
return;
}