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serial: sc16is7xx: dynamically allocate tx/rx buffer 

This fixes the warnings:

   drivers/tty/serial/sc16is7xx.c: In function 'sc16is7xx_handle_rx':
>> drivers/tty/serial/sc16is7xx.c:548:1: warning: 'sc16is7xx_handle_rx' uses dynamic stack allocation [enabled by default]
   drivers/tty/serial/sc16is7xx.c: In function 'sc16is7xx_handle_tx':
>> drivers/tty/serial/sc16is7xx.c:589:1: warning: 'sc16is7xx_handle_tx' uses dynamic stack allocation [enabled by default]

Signed-off-by: Jon Ringle <jringle@gridpoint.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jon Ringle 2014-04-25 20:11:07 -04:00 committed by Greg Kroah-Hartman
parent 3df5adb23f
commit beb04a9f04
1 changed files with 8 additions and 9 deletions
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17
drivers/tty/serial/sc16is7xx.c
View File

@ -317,6 +317,7 @@ struct sc16is7xx_port {
#ifdef CONFIG_GPIOLIB
struct gpio_chip gpio;
#endif
unsigned char buf[SC16IS7XX_FIFO_SIZE];
struct sc16is7xx_one p[0];
};
@ -471,16 +472,15 @@ static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen,
{
struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
unsigned int lsr = 0, ch, flag, bytes_read, i;
u8 buf[port->fifosize];
bool read_lsr = (iir == SC16IS7XX_IIR_RLSE_SRC) ? true : false;
if (unlikely(rxlen >= port->fifosize)) {
if (unlikely(rxlen >= sizeof(s->buf))) {
dev_warn_ratelimited(port->dev,
"Port %i: Possible RX FIFO overrun: %d\n",
port->line, rxlen);
port->icount.buf_overrun++;
/* Ensure sanity of RX level */
rxlen = port->fifosize;
rxlen = sizeof(s->buf);
}
while (rxlen) {
@ -493,12 +493,12 @@ static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen,
lsr = 0;
if (read_lsr) {
buf[0] = sc16is7xx_port_read(port, SC16IS7XX_RHR_REG);
s->buf[0] = sc16is7xx_port_read(port, SC16IS7XX_RHR_REG);
bytes_read = 1;
} else {
regcache_cache_bypass(s->regmap, true);
regmap_raw_read(s->regmap, SC16IS7XX_RHR_REG,
buf, rxlen);
s->buf, rxlen);
regcache_cache_bypass(s->regmap, false);
bytes_read = rxlen;
}
@ -532,7 +532,7 @@ static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen,
}
for (i = 0; i < bytes_read; ++i) {
ch = buf[i];
ch = s->buf[i];
if (uart_handle_sysrq_char(port, ch))
continue;
@ -553,7 +553,6 @@ static void sc16is7xx_handle_tx(struct uart_port *port)
struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
struct circ_buf *xmit = &port->state->xmit;
unsigned int txlen, to_send, i;
u8 buf[port->fifosize];
if (unlikely(port->x_char)) {
sc16is7xx_port_write(port, SC16IS7XX_THR_REG, port->x_char);
@ -577,11 +576,11 @@ static void sc16is7xx_handle_tx(struct uart_port *port)
/* Convert to linear buffer */
for (i = 0; i < to_send; ++i) {
buf[i] = xmit->buf[xmit->tail];
s->buf[i] = xmit->buf[xmit->tail];
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
}
regcache_cache_bypass(s->regmap, true);
regmap_raw_write(s->regmap, SC16IS7XX_THR_REG, buf, to_send);
regmap_raw_write(s->regmap, SC16IS7XX_THR_REG, s->buf, to_send);
regcache_cache_bypass(s->regmap, false);
}