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tty: make receive_buf() return the amout of bytes received

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it makes it simpler to keep track of the amount of
bytes received and simplifies how flush_to_ldisc counts
the remaining bytes. It also fixes a bug of lost bytes
on n_tty when flushing too many bytes via the USB
serial gadget driver.

Tested-by: Stefan Bigler <stefan.bigler@keymile.com>
Tested-by: Toby Gray <toby.gray@realvnc.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Felipe Balbi
2011-03-21 12:25:08 +02:00
committed by Greg Kroah-Hartman
parent e9a470f445
commit b1c43f82c5
20 changed files with 125 additions and 113 deletions
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9
drivers/net/can/slcan.c
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@@ -425,16 +425,17 @@ static void slc_setup(struct net_device *dev)
* in parallel
*/
static void slcan_receive_buf(struct tty_struct *tty,
static unsigned int slcan_receive_buf(struct tty_struct *tty,
const unsigned char *cp, char *fp, int count)
{
struct slcan *sl = (struct slcan *) tty->disc_data;
int bytes = count;
if (!sl || sl->magic != SLCAN_MAGIC || !netif_running(sl->dev))
return;
return -ENODEV;
/* Read the characters out of the buffer */
while (count--) {
while (bytes--) {
if (fp && *fp++) {
if (!test_and_set_bit(SLF_ERROR, &sl->flags))
sl->dev->stats.rx_errors++;
@@ -443,6 +444,8 @@ static void slcan_receive_buf(struct tty_struct *tty,
}
slcan_unesc(sl, *cp++);
}
return count;
}
/************************************