From: Peter Hurley <peter@hurleysoftware.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>,
linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org,
Peter Hurley <peter@hurleysoftware.com>
Subject: [PATCH v2 6/9] tty: Unify receive_buf() code paths
Date: Sun, 10 Jan 2016 20:36:13 -0800 [thread overview]
Message-ID: <1452486976-7594-7-git-send-email-peter@hurleysoftware.com> (raw)
In-Reply-To: <1452486976-7594-1-git-send-email-peter@hurleysoftware.com>
Instead of two distinct code branches for receive_buf() handling,
use tty_ldisc_receive_buf() as the single code path.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/tty/tty_buffer.c | 39 ++++++++++++++++++++++++++++-----------
include/linux/tty.h | 16 ++--------------
2 files changed, 30 insertions(+), 25 deletions(-)
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 3cd31e0..a946e49 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -435,25 +435,42 @@ int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
}
EXPORT_SYMBOL_GPL(tty_prepare_flip_string);
+/**
+ * tty_ldisc_receive_buf - forward data to line discipline
+ * @ld: line discipline to process input
+ * @p: char buffer
+ * @f: TTY_* flags buffer
+ * @count: number of bytes to process
+ *
+ * Callers other than flush_to_ldisc() need to exclude the kworker
+ * from concurrent use of the line discipline, see paste_selection().
+ *
+ * Returns the number of bytes not processed
+ */
+int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
+ char *f, int count)
+{
+ if (ld->ops->receive_buf2)
+ count = ld->ops->receive_buf2(ld->tty, p, f, count);
+ else {
+ count = min_t(int, count, ld->tty->receive_room);
+ if (count && ld->ops->receive_buf)
+ ld->ops->receive_buf(ld->tty, p, f, count);
+ }
+ return count;
+}
+EXPORT_SYMBOL_GPL(tty_ldisc_receive_buf);
static int
-receive_buf(struct tty_struct *tty, struct tty_buffer *head, int count)
+receive_buf(struct tty_ldisc *ld, struct tty_buffer *head, int count)
{
- struct tty_ldisc *disc = tty->ldisc;
unsigned char *p = char_buf_ptr(head, head->read);
char *f = NULL;
if (~head->flags & TTYB_NORMAL)
f = flag_buf_ptr(head, head->read);
- if (disc->ops->receive_buf2)
- count = disc->ops->receive_buf2(tty, p, f, count);
- else {
- count = min_t(int, count, tty->receive_room);
- if (count && disc->ops->receive_buf)
- disc->ops->receive_buf(tty, p, f, count);
- }
- return count;
+ return tty_ldisc_receive_buf(ld, p, f, count);
}
/**
@@ -514,7 +531,7 @@ static void flush_to_ldisc(struct work_struct *work)
continue;
}
- count = receive_buf(tty, head, count);
+ count = receive_buf(disc, head, count);
if (!count)
break;
head->read += count;
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 03e4015..3b09f23 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -571,20 +571,8 @@ extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
extern void tty_ldisc_release(struct tty_struct *tty);
extern void tty_ldisc_init(struct tty_struct *tty);
extern void tty_ldisc_deinit(struct tty_struct *tty);
-
-static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
- char *f, int count)
-{
- if (ld->ops->receive_buf2)
- count = ld->ops->receive_buf2(ld->tty, p, f, count);
- else {
- count = min_t(int, count, ld->tty->receive_room);
- if (count && ld->ops->receive_buf)
- ld->ops->receive_buf(ld->tty, p, f, count);
- }
- return count;
-}
-
+extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
+ char *f, int count);
/* n_tty.c */
extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
--
2.7.0
next prev parent reply other threads:[~2016-01-11 4:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-11 4:36 [PATCH v2 0/9] Misc tty fixes & cleanups Peter Hurley
2016-01-11 4:36 ` [PATCH v2 1/9] tty: rocket: Remove private close_wait Peter Hurley
2016-01-11 4:36 ` [PATCH v2 2/9] n_tty: Ignore all read data when closing Peter Hurley
2016-01-11 4:36 ` [PATCH v2 3/9] ia64: Pin controlling tty for unaligned fault message Peter Hurley
2016-01-11 4:36 ` [PATCH v2 4/9] staging: dgap: Remove redundant write_wait wakeups Peter Hurley
2016-01-11 4:36 ` [PATCH v2 5/9] tty: Fix GPF in flush_to_ldisc(), part 2 Peter Hurley
2016-01-11 4:36 ` Peter Hurley [this message]
2016-01-11 4:36 ` [PATCH v2 7/9] tty: Allow unreadable mess to be > 80 chars Peter Hurley
2016-01-11 4:36 ` [PATCH v2 8/9] tty: Use termios c_*flag macros Peter Hurley
2016-01-19 14:38 ` Johan Hovold
2016-01-11 4:36 ` [PATCH v2 9/9] tty: Use test_bit() with tty->flags Peter Hurley
2016-01-28 22:13 ` Greg Kroah-Hartman
2016-01-28 22:19 ` Peter Hurley
2016-01-28 22:22 ` Greg Kroah-Hartman
2016-04-10 0:06 ` [PATCH] tty: Replace TTY_IO_ERROR bit tests with tty_io_error() Peter Hurley
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1452486976-7594-7-git-send-email-peter@hurleysoftware.com \
--to=peter@hurleysoftware.com \
--cc=gregkh@linuxfoundation.org \
--cc=jslaby@suse.cz \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.