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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 <[email protected]>
Tested-by: Toby Gray <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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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8
drivers/isdn/gigaset/ser-gigaset.c
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@ -674,7 +674,7 @@ gigaset_tty_ioctl(struct tty_struct *tty, struct file *file,
* cflags buffer containing error flags for received characters (ignored)
* count number of received characters
*/
static void
static unsigned int
gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf,
char *cflags, int count)
{
@ -683,12 +683,12 @@ gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf,
struct inbuf_t *inbuf;
if (!cs)
return;
return -ENODEV;
inbuf = cs->inbuf;
if (!inbuf) {
dev_err(cs->dev, "%s: no inbuf\n", __func__);
cs_put(cs);
return;
return -EINVAL;
}
tail = inbuf->tail;
@ -725,6 +725,8 @@ gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf,
gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
gigaset_schedule_event(cs);
cs_put(cs);
return count;
}
/*