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authorFelipe Balbi <balbi@ti.com>2011-03-21 12:25:08 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-04-22 17:31:53 -0700
commitb1c43f82c5aa265442f82dba31ce985ebb7aa71c (patch)
tree8b344d8d5355b30e8deff901180edc708a653227 /drivers/net/slip.c
parente9a470f445271eb157ee860a93b062324402fc3a (diff)
tty: make receive_buf() return the amout of bytes received
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>
Diffstat (limited to 'drivers/net/slip.c')
-rw-r--r--drivers/net/slip.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/net/slip.c b/drivers/net/slip.c
index 86cbb9ea2f2..86718d35839 100644
--- a/drivers/net/slip.c
+++ b/drivers/net/slip.c
@@ -670,16 +670,17 @@ static void sl_setup(struct net_device *dev)
* in parallel
*/
-static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
- char *fp, int count)
+static unsigned int slip_receive_buf(struct tty_struct *tty,
+ const unsigned char *cp, char *fp, int count)
{
struct slip *sl = tty->disc_data;
+ int bytes = count;
if (!sl || sl->magic != SLIP_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++;
@@ -693,6 +694,8 @@ static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
#endif
slip_unesc(sl, *cp++);
}
+
+ return count;
}
/************************************