| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20250814072456.182853-6-jirislaby@kernel.org>
Date: Thu, 14 Aug 2025 09:24:45 +0200
From: "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To: gregkh@...uxfoundation.org
Cc: linux-serial@...r.kernel.org,
linux-kernel@...r.kernel.org,
"Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Subject: [PATCH 05/16] tty: tty_port: use guard()s
Having all the new guards, use them in the tty_port code. This improves
readability, makes error handling easier, and marks locked portions of
code explicit.
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
drivers/tty/tty_port.c | 168 ++++++++++++++++++-----------------------
1 file changed, 74 insertions(+), 94 deletions(-)
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 5b4d5fb99a59..fe67c5cb0a3f 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -63,12 +63,8 @@ static void tty_port_default_lookahead_buf(struct tty_port *port, const u8 *p,
static void tty_port_default_wakeup(struct tty_port *port)
{
- struct tty_struct *tty = tty_port_tty_get(port);
-
- if (tty) {
- tty_wakeup(tty);
- tty_kref_put(tty);
- }
+ scoped_guard(tty_port_tty, port)
+ tty_wakeup(scoped_tty());
}
const struct tty_port_client_operations tty_port_default_client_ops = {
@@ -225,26 +221,27 @@ EXPORT_SYMBOL_GPL(tty_port_unregister_device);
int tty_port_alloc_xmit_buf(struct tty_port *port)
{
/* We may sleep in get_zeroed_page() */
- mutex_lock(&port->buf_mutex);
- if (port->xmit_buf == NULL) {
- port->xmit_buf = (u8 *)get_zeroed_page(GFP_KERNEL);
- if (port->xmit_buf)
- kfifo_init(&port->xmit_fifo, port->xmit_buf, PAGE_SIZE);
- }
- mutex_unlock(&port->buf_mutex);
+ guard(mutex)(&port->buf_mutex);
+
+ if (port->xmit_buf)
+ return 0;
+
+ port->xmit_buf = (u8 *)get_zeroed_page(GFP_KERNEL);
if (port->xmit_buf == NULL)
return -ENOMEM;
+
+ kfifo_init(&port->xmit_fifo, port->xmit_buf, PAGE_SIZE);
+
return 0;
}
EXPORT_SYMBOL(tty_port_alloc_xmit_buf);
void tty_port_free_xmit_buf(struct tty_port *port)
{
- mutex_lock(&port->buf_mutex);
+ guard(mutex)(&port->buf_mutex);
free_page((unsigned long)port->xmit_buf);
port->xmit_buf = NULL;
INIT_KFIFO(port->xmit_fifo);
- mutex_unlock(&port->buf_mutex);
}
EXPORT_SYMBOL(tty_port_free_xmit_buf);
@@ -301,13 +298,8 @@ EXPORT_SYMBOL(tty_port_put);
*/
struct tty_struct *tty_port_tty_get(struct tty_port *port)
{
- unsigned long flags;
- struct tty_struct *tty;
-
- spin_lock_irqsave(&port->lock, flags);
- tty = tty_kref_get(port->tty);
- spin_unlock_irqrestore(&port->lock, flags);
- return tty;
+ guard(spinlock_irqsave)(&port->lock);
+ return tty_kref_get(port->tty);
}
EXPORT_SYMBOL(tty_port_tty_get);
@@ -321,12 +313,9 @@ EXPORT_SYMBOL(tty_port_tty_get);
*/
void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
{
- unsigned long flags;
-
- spin_lock_irqsave(&port->lock, flags);
+ guard(spinlock_irqsave)(&port->lock);
tty_kref_put(port->tty);
port->tty = tty_kref_get(tty);
- spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL(tty_port_tty_set);
@@ -342,24 +331,24 @@ EXPORT_SYMBOL(tty_port_tty_set);
*/
static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)
{
- mutex_lock(&port->mutex);
+ guard(mutex)(&port->mutex);
+
if (port->console)
- goto out;
+ return;
- if (tty_port_initialized(port)) {
- tty_port_set_initialized(port, false);
- /*
- * Drop DTR/RTS if HUPCL is set. This causes any attached
- * modem to hang up the line.
- */
- if (tty && C_HUPCL(tty))
- tty_port_lower_dtr_rts(port);
+ if (!tty_port_initialized(port))
+ return;
- if (port->ops->shutdown)
- port->ops->shutdown(port);
- }
-out:
- mutex_unlock(&port->mutex);
+ tty_port_set_initialized(port, false);
+ /*
+ * Drop DTR/RTS if HUPCL is set. This causes any attached
+ * modem to hang up the line.
+ */
+ if (tty && C_HUPCL(tty))
+ tty_port_lower_dtr_rts(port);
+
+ if (port->ops->shutdown)
+ port->ops->shutdown(port);
}
/**
@@ -374,15 +363,15 @@ static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)
void tty_port_hangup(struct tty_port *port)
{
struct tty_struct *tty;
- unsigned long flags;
- spin_lock_irqsave(&port->lock, flags);
- port->count = 0;
- tty = port->tty;
- if (tty)
- set_bit(TTY_IO_ERROR, &tty->flags);
- port->tty = NULL;
- spin_unlock_irqrestore(&port->lock, flags);
+ scoped_guard(spinlock_irqsave, &port->lock) {
+ port->count = 0;
+ tty = port->tty;
+ if (tty)
+ set_bit(TTY_IO_ERROR, &tty->flags);
+ port->tty = NULL;
+ }
+
tty_port_set_active(port, false);
tty_port_shutdown(port, tty);
tty_kref_put(tty);
@@ -393,15 +382,16 @@ EXPORT_SYMBOL(tty_port_hangup);
void __tty_port_tty_hangup(struct tty_port *port, bool check_clocal, bool async)
{
- struct tty_struct *tty = tty_port_tty_get(port);
+ scoped_guard(tty_port_tty, port) {
+ struct tty_struct *tty = scoped_tty();
- if (tty && (!check_clocal || !C_CLOCAL(tty))) {
- if (async)
- tty_hangup(tty);
- else
- tty_vhangup(tty);
+ if (!check_clocal || !C_CLOCAL(tty)) {
+ if (async)
+ tty_hangup(tty);
+ else
+ tty_vhangup(tty);
+ }
}
- tty_kref_put(tty);
}
EXPORT_SYMBOL_GPL(__tty_port_tty_hangup);
@@ -490,7 +480,6 @@ int tty_port_block_til_ready(struct tty_port *port,
struct tty_struct *tty, struct file *filp)
{
int do_clocal = 0, retval;
- unsigned long flags;
DEFINE_WAIT(wait);
/* if non-blocking mode is set we can pass directly to open unless
@@ -519,10 +508,10 @@ int tty_port_block_til_ready(struct tty_port *port,
retval = 0;
/* The port lock protects the port counts */
- spin_lock_irqsave(&port->lock, flags);
- port->count--;
- port->blocked_open++;
- spin_unlock_irqrestore(&port->lock, flags);
+ scoped_guard(spinlock_irqsave, &port->lock) {
+ port->count--;
+ port->blocked_open++;
+ }
while (1) {
/* Indicate we are open */
@@ -561,11 +550,11 @@ int tty_port_block_til_ready(struct tty_port *port,
/* Update counts. A parallel hangup will have set count to zero and
* we must not mess that up further.
*/
- spin_lock_irqsave(&port->lock, flags);
- if (!tty_hung_up_p(filp))
- port->count++;
- port->blocked_open--;
- spin_unlock_irqrestore(&port->lock, flags);
+ scoped_guard(spinlock_irqsave, &port->lock) {
+ if (!tty_hung_up_p(filp))
+ port->count++;
+ port->blocked_open--;
+ }
if (retval == 0)
tty_port_set_active(port, true);
return retval;
@@ -604,28 +593,24 @@ static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)
int tty_port_close_start(struct tty_port *port,
struct tty_struct *tty, struct file *filp)
{
- unsigned long flags;
-
if (tty_hung_up_p(filp))
return 0;
- spin_lock_irqsave(&port->lock, flags);
- if (tty->count == 1 && port->count != 1) {
- tty_warn(tty, "%s: tty->count = 1 port count = %d\n", __func__,
- port->count);
- port->count = 1;
- }
- if (--port->count < 0) {
- tty_warn(tty, "%s: bad port count (%d)\n", __func__,
- port->count);
- port->count = 0;
- }
+ scoped_guard(spinlock_irqsave, &port->lock) {
+ if (tty->count == 1 && port->count != 1) {
+ tty_warn(tty, "%s: tty->count = 1 port count = %d\n", __func__,
+ port->count);
+ port->count = 1;
+ }
+ if (--port->count < 0) {
+ tty_warn(tty, "%s: bad port count (%d)\n", __func__,
+ port->count);
+ port->count = 0;
+ }
- if (port->count) {
- spin_unlock_irqrestore(&port->lock, flags);
- return 0;
+ if (port->count)
+ return 0;
}
- spin_unlock_irqrestore(&port->lock, flags);
tty->closing = 1;
@@ -744,9 +729,8 @@ EXPORT_SYMBOL_GPL(tty_port_install);
int tty_port_open(struct tty_port *port, struct tty_struct *tty,
struct file *filp)
{
- spin_lock_irq(&port->lock);
- ++port->count;
- spin_unlock_irq(&port->lock);
+ scoped_guard(spinlock_irq, &port->lock)
+ ++port->count;
tty_port_tty_set(port, tty);
/*
@@ -755,21 +739,17 @@ int tty_port_open(struct tty_port *port, struct tty_struct *tty,
* port mutex.
*/
- mutex_lock(&port->mutex);
-
- if (!tty_port_initialized(port)) {
+ scoped_guard(mutex, &port->mutex) {
+ if (tty_port_initialized(port))
+ break;
clear_bit(TTY_IO_ERROR, &tty->flags);
if (port->ops->activate) {
int retval = port->ops->activate(port, tty);
-
- if (retval) {
- mutex_unlock(&port->mutex);
+ if (retval)
return retval;
- }
}
tty_port_set_initialized(port, true);
}
- mutex_unlock(&port->mutex);
return tty_port_block_til_ready(port, tty, filp);
}
EXPORT_SYMBOL(tty_port_open);
--
2.50.1
Powered by blists - more mailing lists