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Staging: ipack/devices/ipoctal: read more than one character from RX FIFO. 

The RX FIFO has a size of 3 characters. Check if when we are picking the
oldest one, we have more to read.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Samuel Iglesias Gonsalvez 2012-09-12 14:55:43 +02:00 committed by Greg Kroah-Hartman
parent 9c1d784afc
commit ab0a71f06d
1 changed files with 34 additions and 22 deletions
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16
drivers/staging/ipack/devices/ipoctal.c
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@ -134,9 +134,12 @@ static int ipoctal_get_icount(struct tty_struct *tty,
static void ipoctal_irq_rx(struct ipoctal_channel *channel,
struct tty_struct *tty, u8 sr)
{
unsigned char value = ioread8(&channel->regs->r.rhr);
unsigned char value;
unsigned char flag = TTY_NORMAL;
u8 isr;
do {
value = ioread8(&channel->regs->r.rhr);
/* Error: count statistics */
if (sr & SR_ERROR) {
iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
@ -159,8 +162,17 @@ static void ipoctal_irq_rx(struct ipoctal_channel *channel,
flag = TTY_BREAK;
}
}
tty_insert_flip_char(tty, value, flag);
/* Check if there are more characters in RX FIFO
* If there are more, the isr register for this channel
* has enabled the RxRDY|FFULL bit.
*/
isr = ioread8(&channel->block_regs->r.isr);
sr = ioread8(&channel->regs->r.sr);
} while (isr & channel->isr_rx_rdy_mask);
tty_flip_buffer_push(tty);
}
static void ipoctal_irq_tx(struct ipoctal_channel *channel)