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Date: Tue, 31 May 2011 12:24:03 +0200 (CEST)
From: Guennadi Liakhovetski <g.liakhovetski@....de>
To: Peter Hüwe <PeterHuewe@....de>
cc: Greg KH <gregkh@...e.de>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
Felipe Balbi <balbi@...com>
Subject: Re: [GIT PATCH] TTY/serial driver patches for .40
On Tue, 31 May 2011, Peter Hüwe wrote:
> Am Dienstag 31 Mai 2011, 00:04:24 schrieb Peter Hüwe:
> > Am Freitag 27 Mai 2011, 03:00:21 schrieb Greg KH:
> > > > > Felipe Balbi (1):
> > > > > tty: make receive_buf() return the amout of bytes received
> > > I think I'll be reverting this one.
> > maybe that's related to receive_buf returning an unsigned int, which is
> > obviously incompatible with -ENODEV, -EINVAL and the likes, which most of
> > the functions now return in case of error.
> > And unfortunately the return value is unfortunately not checked for errors
> > either - so the amount is totally screwed then ;)
> >
> > I could create a patch if desired.
>
> @Guennadi:
> Maybe you could try this patch?
Tested, doesn't help.
Thanks
Guennadi
> I know it's far from perfect ;)
>
> From b73b6ad336a702f26a47f05fb60aeafb6044b029 Mon Sep 17 00:00:00 2001
> From: Peter Huewe <peterhuewe@....de>
> Date: Tue, 31 May 2011 00:31:01 +0200
> Subject: [PATCH] tty: fix receive_buf return value for error handling
>
> This patch converts the return value of the receive_buf callbacks from
> unsigned int to int, thus enabling the use of negative values for error
> handling.
>
> Moreover checking the return code for receive_buf was added.
>
> And while at it the receive_buf callback in drivers/net/wan/x25_asy.c was fixed.
> (used to not return a value in case of error)
>
> Signed-off-by: Peter Huewe <peterhuewe@....de>
> ---
> Patch is against current Linus' git tree.
>
> drivers/bluetooth/hci_ldisc.c | 2 +-
> drivers/input/serio/serport.c | 2 +-
> drivers/isdn/gigaset/ser-gigaset.c | 2 +-
> drivers/misc/ti-st/st_core.c | 2 +-
> drivers/net/caif/caif_serial.c | 2 +-
> drivers/net/can/slcan.c | 2 +-
> drivers/net/hamradio/6pack.c | 2 +-
> drivers/net/hamradio/mkiss.c | 2 +-
> drivers/net/irda/irtty-sir.c | 2 +-
> drivers/net/ppp_async.c | 2 +-
> drivers/net/ppp_synctty.c | 2 +-
> drivers/net/slip.c | 2 +-
> drivers/net/wan/x25_asy.c | 4 ++--
> drivers/tty/n_gsm.c | 2 +-
> drivers/tty/n_hdlc.c | 4 ++--
> drivers/tty/n_r3964.c | 4 ++--
> drivers/tty/n_tty.c | 2 +-
> drivers/tty/tty_buffer.c | 3 +++
> drivers/tty/vt/selection.c | 9 +++++++--
> include/linux/tty_ldisc.h | 4 ++--
> 20 files changed, 32 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
> index b3f0199..d09b20d 100644
> --- a/drivers/bluetooth/hci_ldisc.c
> +++ b/drivers/bluetooth/hci_ldisc.c
> @@ -357,7 +357,7 @@ static void hci_uart_tty_wakeup(struct tty_struct *tty)
> *
> * Return Value: Number of bytes received
> */
> -static unsigned int hci_uart_tty_receive(struct tty_struct *tty,
> +static int hci_uart_tty_receive(struct tty_struct *tty,
> const u8 *data, char *flags, int count)
> {
> struct hci_uart *hu = (void *)tty->disc_data;
> diff --git a/drivers/input/serio/serport.c b/drivers/input/serio/serport.c
> index f369896..0f55699 100644
> --- a/drivers/input/serio/serport.c
> +++ b/drivers/input/serio/serport.c
> @@ -120,7 +120,7 @@ static void serport_ldisc_close(struct tty_struct *tty)
> * 'interrupt' routine.
> */
>
> -static unsigned int serport_ldisc_receive(struct tty_struct *tty,
> +static int serport_ldisc_receive(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> struct serport *serport = (struct serport*) tty->disc_data;
> diff --git a/drivers/isdn/gigaset/ser-gigaset.c b/drivers/isdn/gigaset/ser-gigaset.c
> index 1d44d47..ed27f0f 100644
> --- a/drivers/isdn/gigaset/ser-gigaset.c
> +++ b/drivers/isdn/gigaset/ser-gigaset.c
> @@ -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 unsigned int
> +static int
> gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf,
> char *cflags, int count)
> {
> diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
> index 1a05fe0..eb63cc3 100644
> --- a/drivers/misc/ti-st/st_core.c
> +++ b/drivers/misc/ti-st/st_core.c
> @@ -747,7 +747,7 @@ static void st_tty_close(struct tty_struct *tty)
> pr_debug("%s: done ", __func__);
> }
>
> -static unsigned int st_tty_receive(struct tty_struct *tty,
> +static int st_tty_receive(struct tty_struct *tty,
> const unsigned char *data, char *tty_flags, int count)
> {
> #ifdef VERBOSE
> diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c
> index 73c7e03..51073b5 100644
> --- a/drivers/net/caif/caif_serial.c
> +++ b/drivers/net/caif/caif_serial.c
> @@ -167,7 +167,7 @@ static inline void debugfs_tx(struct ser_device *ser, const u8 *data, int size)
>
> #endif
>
> -static unsigned int ldisc_receive(struct tty_struct *tty,
> +static int ldisc_receive(struct tty_struct *tty,
> const u8 *data, char *flags, int count)
> {
> struct sk_buff *skb = NULL;
> diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c
> index 75622d5..89ccd90 100644
> --- a/drivers/net/can/slcan.c
> +++ b/drivers/net/can/slcan.c
> @@ -425,7 +425,7 @@ static void slc_setup(struct net_device *dev)
> * in parallel
> */
>
> -static unsigned int slcan_receive_buf(struct tty_struct *tty,
> +static int slcan_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> struct slcan *sl = (struct slcan *) tty->disc_data;
> diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
> index 9920896..cdd1fd8 100644
> --- a/drivers/net/hamradio/6pack.c
> +++ b/drivers/net/hamradio/6pack.c
> @@ -456,7 +456,7 @@ out:
> * a block of 6pack data has been received, which can now be decapsulated
> * and sent on to some IP layer for further processing.
> */
> -static unsigned int sixpack_receive_buf(struct tty_struct *tty,
> +static int sixpack_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> struct sixpack *sp;
> diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
> index 0e4f235..6a12b2d 100644
> --- a/drivers/net/hamradio/mkiss.c
> +++ b/drivers/net/hamradio/mkiss.c
> @@ -923,7 +923,7 @@ static long mkiss_compat_ioctl(struct tty_struct *tty, struct file *file,
> * a block of data has been received, which can now be decapsulated
> * and sent on to the AX.25 layer for further processing.
> */
> -static unsigned int mkiss_receive_buf(struct tty_struct *tty,
> +static int mkiss_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> struct mkiss *ax = mkiss_get(tty);
> diff --git a/drivers/net/irda/irtty-sir.c b/drivers/net/irda/irtty-sir.c
> index 035861d..17d0dfa 100644
> --- a/drivers/net/irda/irtty-sir.c
> +++ b/drivers/net/irda/irtty-sir.c
> @@ -216,7 +216,7 @@ static int irtty_do_write(struct sir_dev *dev, const unsigned char *ptr, size_t
> * usbserial: urb-complete-interrupt / softint
> */
>
> -static unsigned int irtty_receive_buf(struct tty_struct *tty,
> +static int irtty_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> struct sir_dev *dev;
> diff --git a/drivers/net/ppp_async.c b/drivers/net/ppp_async.c
> index 53872d7..078ef8b 100644
> --- a/drivers/net/ppp_async.c
> +++ b/drivers/net/ppp_async.c
> @@ -340,7 +340,7 @@ ppp_asynctty_poll(struct tty_struct *tty, struct file *file, poll_table *wait)
> }
>
> /* May sleep, don't call from interrupt level or with interrupts disabled */
> -static unsigned int
> +static int
> ppp_asynctty_receive(struct tty_struct *tty, const unsigned char *buf,
> char *cflags, int count)
> {
> diff --git a/drivers/net/ppp_synctty.c b/drivers/net/ppp_synctty.c
> index 0815790..1a2dc65 100644
> --- a/drivers/net/ppp_synctty.c
> +++ b/drivers/net/ppp_synctty.c
> @@ -381,7 +381,7 @@ ppp_sync_poll(struct tty_struct *tty, struct file *file, poll_table *wait)
> }
>
> /* May sleep, don't call from interrupt level or with interrupts disabled */
> -static unsigned int
> +static int
> ppp_sync_receive(struct tty_struct *tty, const unsigned char *buf,
> char *cflags, int count)
> {
> diff --git a/drivers/net/slip.c b/drivers/net/slip.c
> index 584809c..992dca7 100644
> --- a/drivers/net/slip.c
> +++ b/drivers/net/slip.c
> @@ -670,7 +670,7 @@ static void sl_setup(struct net_device *dev)
> * in parallel
> */
>
> -static unsigned int slip_receive_buf(struct tty_struct *tty,
> +static int slip_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> struct slip *sl = tty->disc_data;
> diff --git a/drivers/net/wan/x25_asy.c b/drivers/net/wan/x25_asy.c
> index 40398bf..33fa920 100644
> --- a/drivers/net/wan/x25_asy.c
> +++ b/drivers/net/wan/x25_asy.c
> @@ -517,14 +517,14 @@ static int x25_asy_close(struct net_device *dev)
> * and sent on to some IP layer for further processing.
> */
>
> -static unsigned int x25_asy_receive_buf(struct tty_struct *tty,
> +static int x25_asy_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> struct x25_asy *sl = tty->disc_data;
> int bytes = count;
>
> if (!sl || sl->magic != X25_ASY_MAGIC || !netif_running(sl->dev))
> - return;
> + return -ENODEV;
>
>
> /* Read the characters out of the buffer */
> diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
> index a4c42a7..96ed3eb 100644
> --- a/drivers/tty/n_gsm.c
> +++ b/drivers/tty/n_gsm.c
> @@ -2128,7 +2128,7 @@ static void gsmld_detach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
> gsm->tty = NULL;
> }
>
> -static unsigned int gsmld_receive_buf(struct tty_struct *tty,
> +static int gsmld_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> struct gsm_mux *gsm = tty->disc_data;
> diff --git a/drivers/tty/n_hdlc.c b/drivers/tty/n_hdlc.c
> index cac6663..1c40879 100644
> --- a/drivers/tty/n_hdlc.c
> +++ b/drivers/tty/n_hdlc.c
> @@ -188,7 +188,7 @@ static unsigned int n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp,
> poll_table *wait);
> static int n_hdlc_tty_open(struct tty_struct *tty);
> static void n_hdlc_tty_close(struct tty_struct *tty);
> -static unsigned int n_hdlc_tty_receive(struct tty_struct *tty,
> +static int n_hdlc_tty_receive(struct tty_struct *tty,
> const __u8 *cp, char *fp, int count);
> static void n_hdlc_tty_wakeup(struct tty_struct *tty);
>
> @@ -509,7 +509,7 @@ static void n_hdlc_tty_wakeup(struct tty_struct *tty)
> * Called by tty low level driver when receive data is available. Data is
> * interpreted as one HDLC frame.
> */
> -static unsigned int n_hdlc_tty_receive(struct tty_struct *tty,
> +static int n_hdlc_tty_receive(struct tty_struct *tty,
> const __u8 *data, char *flags, int count)
> {
> register struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
> diff --git a/drivers/tty/n_r3964.c b/drivers/tty/n_r3964.c
> index a4bc39c..43384b3 100644
> --- a/drivers/tty/n_r3964.c
> +++ b/drivers/tty/n_r3964.c
> @@ -139,7 +139,7 @@ static int r3964_ioctl(struct tty_struct *tty, struct file *file,
> static void r3964_set_termios(struct tty_struct *tty, struct ktermios *old);
> static unsigned int r3964_poll(struct tty_struct *tty, struct file *file,
> struct poll_table_struct *wait);
> -static unsigned int r3964_receive_buf(struct tty_struct *tty,
> +static int r3964_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count);
>
> static struct tty_ldisc_ops tty_ldisc_N_R3964 = {
> @@ -1239,7 +1239,7 @@ static unsigned int r3964_poll(struct tty_struct *tty, struct file *file,
> return result;
> }
>
> -static unsigned int r3964_receive_buf(struct tty_struct *tty,
> +static int r3964_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> struct r3964_info *pInfo = tty->disc_data;
> diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
> index 95d0a9c..ced315a 100644
> --- a/drivers/tty/n_tty.c
> +++ b/drivers/tty/n_tty.c
> @@ -1327,7 +1327,7 @@ static void n_tty_write_wakeup(struct tty_struct *tty)
> * calls one at a time and in order (or using flush_to_ldisc)
> */
>
> -static unsigned int n_tty_receive_buf(struct tty_struct *tty,
> +static int n_tty_receive_buf(struct tty_struct *tty,
> const unsigned char *cp, char *fp, int count)
> {
> const unsigned char *p;
> diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
> index 46de2e0..38d25f5 100644
> --- a/drivers/tty/tty_buffer.c
> +++ b/drivers/tty/tty_buffer.c
> @@ -448,6 +448,9 @@ static void flush_to_ldisc(struct work_struct *work)
> spin_unlock_irqrestore(&tty->buf.lock, flags);
> copied = disc->ops->receive_buf(tty, char_buf,
> flag_buf, count);
> + if (copied < 0)
> + break; //ERROR
> +
> spin_lock_irqsave(&tty->buf.lock, flags);
>
> head->read += copied;
> diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
> index 67b1d0d..67c7650 100644
> --- a/drivers/tty/vt/selection.c
> +++ b/drivers/tty/vt/selection.c
> @@ -308,6 +308,7 @@ int paste_selection(struct tty_struct *tty)
> int pasted = 0;
> unsigned int count;
> struct tty_ldisc *ld;
> + int retval = 0;
> DECLARE_WAITQUEUE(wait, current);
>
> /* always called with BTM from vt_ioctl */
> @@ -331,14 +332,18 @@ int paste_selection(struct tty_struct *tty)
> schedule();
> continue;
> }
> - count = sel_buffer_lth - pasted;
> + count = sel_buffer_lth - pasted; // USELESS?
> count = tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted,
> NULL, count);
> + if (count < 0) {
> + retval = count;
> + break;
> + }
> pasted += count;
> }
> remove_wait_queue(&vc->paste_wait, &wait);
> __set_current_state(TASK_RUNNING);
>
> tty_ldisc_deref(ld);
> - return 0;
> + return retval;
> }
> diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
> index 5b07792..e251028 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.
> *
> - * unsigned int (*receive_buf)(struct tty_struct *, const unsigned char *cp,
> + * 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
> @@ -141,7 +141,7 @@ struct tty_ldisc_ops {
> /*
> * The following routines are called from below.
> */
> - unsigned int (*receive_buf)(struct tty_struct *,
> + 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,
> --
> 1.7.3.4
>
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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