diff options
| author | Felipe Balbi <balbi@ti.com> | 2011-03-21 12:25:08 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-22 17:31:53 -0700 |
| commit | b1c43f82c5aa265442f82dba31ce985ebb7aa71c (patch) | |
| tree | 8b344d8d5355b30e8deff901180edc708a653227 /include/linux/tty_ldisc.h | |
| parent | e9a470f445271eb157ee860a93b062324402fc3a (diff) | |
| download | lwn-b1c43f82c5aa265442f82dba31ce985ebb7aa71c.tar.gz lwn-b1c43f82c5aa265442f82dba31ce985ebb7aa71c.zip | |
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 'include/linux/tty_ldisc.h')
| -rw-r--r-- | include/linux/tty_ldisc.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h index ff7dc08696a8..5b07792ccb46 100644 --- a/include/linux/tty_ldisc.h +++ b/include/linux/tty_ldisc.h @@ -76,7 +76,7 @@ * tty device. It is solely the responsibility of the line * discipline to handle poll requests. * - * void (*receive_buf)(struct tty_struct *, const unsigned char *cp, + * unsigned int (*receive_buf)(struct tty_struct *, const unsigned char *cp, * char *fp, int count); * * This function is called by the low-level tty driver to send @@ -84,7 +84,8 @@ * processing. <cp> is a pointer to the buffer of input * character received by the device. <fp> is a pointer to a * pointer of flag bytes which indicate whether a character was - * received with a parity error, etc. + * received with a parity error, etc. Returns the amount of bytes + * received. * * void (*write_wakeup)(struct tty_struct *); * @@ -140,8 +141,8 @@ struct tty_ldisc_ops { /* * The following routines are called from below. */ - void (*receive_buf)(struct tty_struct *, const unsigned char *cp, - char *fp, int count); + unsigned int (*receive_buf)(struct tty_struct *, + const unsigned char *cp, char *fp, int count); void (*write_wakeup)(struct tty_struct *); void (*dcd_change)(struct tty_struct *, unsigned int, struct pps_event_time *); |