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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
commit b1c43f82c5
20 changed files with 125 additions and 113 deletions
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10
drivers/input/serio/serport.c
View file

@ -120,17 +120,21 @@ static void serport_ldisc_close(struct tty_struct *tty)
* 'interrupt' routine.
*/
static void serport_ldisc_receive(struct tty_struct *tty, const unsigned char *cp, char *fp, int count)
static unsigned int serport_ldisc_receive(struct tty_struct *tty,
const unsigned char *cp, char *fp, int count)
{
struct serport *serport = (struct serport*) tty->disc_data;
unsigned long flags;
unsigned int ch_flags;
int ret = 0;
int i;
spin_lock_irqsave(&serport->lock, flags);
if (!test_bit(SERPORT_ACTIVE, &serport->flags))
if (!test_bit(SERPORT_ACTIVE, &serport->flags)) {
ret = -EINVAL;
goto out;
}
for (i = 0; i < count; i++) {
switch (fp[i]) {
@ -152,6 +156,8 @@ static void serport_ldisc_receive(struct tty_struct *tty, const unsigned char *c
out:
spin_unlock_irqrestore(&serport->lock, flags);
return ret == 0 ? count : ret;
}
/*