From: Johan Hovold <johan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
Johan Hovold <johan@kernel.org>
Subject: [PATCH 5/8] tty: refactor TIOCSSERIAL handling
Date: Wed, 7 Apr 2021 11:52:05 +0200 [thread overview]
Message-ID: <20210407095208.31838-6-johan@kernel.org> (raw)
In-Reply-To: <20210407095208.31838-1-johan@kernel.org>
Factor out the deprecated serial flags handling and tty-operation check
shared with the compat TIOCSSERIAL handler.
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/tty/tty_io.c | 33 ++++++++++++++++-----------------
1 file changed, 16 insertions(+), 17 deletions(-)
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index e00efd299abd..36e6b28fb80d 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2624,23 +2624,31 @@ static int tty_tiocgicount(struct tty_struct *tty, void __user *arg)
return 0;
}
-static int tty_tiocsserial(struct tty_struct *tty, struct serial_struct __user *ss)
+static int tty_set_serial(struct tty_struct *tty, struct serial_struct *ss)
{
char comm[TASK_COMM_LEN];
- struct serial_struct v;
int flags;
- if (copy_from_user(&v, ss, sizeof(*ss)))
- return -EFAULT;
-
- flags = v.flags & ASYNC_DEPRECATED;
+ flags = ss->flags & ASYNC_DEPRECATED;
if (flags)
pr_warn_ratelimited("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n",
__func__, get_task_comm(comm, current), flags);
+
if (!tty->ops->set_serial)
return -ENOTTY;
- return tty->ops->set_serial(tty, &v);
+
+ return tty->ops->set_serial(tty, ss);
+}
+
+static int tty_tiocsserial(struct tty_struct *tty, struct serial_struct __user *ss)
+{
+ struct serial_struct v;
+
+ if (copy_from_user(&v, ss, sizeof(*ss)))
+ return -EFAULT;
+
+ return tty_set_serial(tty, &v);
}
static int tty_tiocgserial(struct tty_struct *tty, struct serial_struct __user *ss)
@@ -2838,10 +2846,8 @@ struct serial_struct32 {
static int compat_tty_tiocsserial(struct tty_struct *tty,
struct serial_struct32 __user *ss)
{
- char comm[TASK_COMM_LEN];
struct serial_struct32 v32;
struct serial_struct v;
- int flags;
if (copy_from_user(&v32, ss, sizeof(*ss)))
return -EFAULT;
@@ -2852,14 +2858,7 @@ static int compat_tty_tiocsserial(struct tty_struct *tty,
v.port_high = v32.port_high;
v.iomap_base = 0;
- flags = v.flags & ASYNC_DEPRECATED;
-
- if (flags)
- pr_warn_ratelimited("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n",
- __func__, get_task_comm(comm, current), flags);
- if (!tty->ops->set_serial)
- return -ENOTTY;
- return tty->ops->set_serial(tty, &v);
+ return tty_set_serial(tty, &v);
}
static int compat_tty_tiocgserial(struct tty_struct *tty,
--
2.26.3
next prev parent reply other threads:[~2021-04-07 9:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 9:52 [PATCH 0/8] tty: ioctl fixes and cleanups Johan Hovold
2021-04-07 9:52 ` [PATCH 1/8] tty: actually undefine superseded ASYNC flags Johan Hovold
2021-04-07 9:52 ` [PATCH 2/8] tty: fix return value for unsupported ioctls Johan Hovold
2021-04-07 9:52 ` [PATCH 3/8] tty: fix return value for unsupported termiox ioctls Johan Hovold
2021-04-07 9:52 ` [PATCH 4/8] tty: use pr_warn_ratelimited() for deprecated serial flags Johan Hovold
2021-04-07 9:52 ` Johan Hovold [this message]
2021-04-07 9:52 ` [PATCH 6/8] tty: add ASYNC_SPLIT_TERMIOS to deprecation mask Johan Hovold
2021-04-07 9:52 ` [PATCH 7/8] serial: core: drop redundant TIOCGSERIAL memset Johan Hovold
2021-04-07 9:52 ` [PATCH 8/8] serial: core: return early on unsupported ioctls Johan Hovold
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