Update Linux to v5.4.148
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.148.tar.gz
Change-Id: Ib3d26c5ba9b022e2e03533005c4fed4d7c30b61b
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 802c121..ddfe873 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2176,8 +2176,6 @@
* Locking:
* Called functions take tty_ldiscs_lock
* current->signal->tty check is safe without locks
- *
- * FIXME: may race normal receive processing
*/
static int tiocsti(struct tty_struct *tty, char __user *p)
@@ -2193,8 +2191,10 @@
ld = tty_ldisc_ref_wait(tty);
if (!ld)
return -EIO;
+ tty_buffer_lock_exclusive(tty->port);
if (ld->ops->receive_buf)
ld->ops->receive_buf(tty, &ch, &mbz, 1);
+ tty_buffer_unlock_exclusive(tty->port);
tty_ldisc_deref(ld);
return 0;
}
@@ -2407,14 +2407,14 @@
* @p: pointer to result
*
* Obtain the modem status bits from the tty driver if the feature
- * is supported. Return -EINVAL if it is not available.
+ * is supported. Return -ENOTTY if it is not available.
*
* Locking: none (up to the driver)
*/
static int tty_tiocmget(struct tty_struct *tty, int __user *p)
{
- int retval = -EINVAL;
+ int retval = -ENOTTY;
if (tty->ops->tiocmget) {
retval = tty->ops->tiocmget(tty);
@@ -2432,7 +2432,7 @@
* @p: pointer to desired bits
*
* Set the modem status bits from the tty driver if the feature
- * is supported. Return -EINVAL if it is not available.
+ * is supported. Return -ENOTTY if it is not available.
*
* Locking: none (up to the driver)
*/
@@ -2444,7 +2444,7 @@
unsigned int set, clear, val;
if (tty->ops->tiocmset == NULL)
- return -EINVAL;
+ return -ENOTTY;
retval = get_user(val, p);
if (retval)
@@ -2731,9 +2731,11 @@
struct serial_struct32 v32;
struct serial_struct v;
int err;
- memset(&v, 0, sizeof(struct serial_struct));
- if (!tty->ops->set_serial)
+ memset(&v, 0, sizeof(v));
+ memset(&v32, 0, sizeof(v32));
+
+ if (!tty->ops->get_serial)
return -ENOTTY;
err = tty->ops->get_serial(tty, &v);
if (!err) {
@@ -2892,10 +2894,14 @@
struct task_struct *g, *p;
struct pid *session;
int i;
+ unsigned long flags;
if (!tty)
return;
- session = tty->session;
+
+ spin_lock_irqsave(&tty->ctrl_lock, flags);
+ session = get_pid(tty->session);
+ spin_unlock_irqrestore(&tty->ctrl_lock, flags);
tty_ldisc_flush(tty);
@@ -2927,6 +2933,7 @@
task_unlock(p);
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
+ put_pid(session);
#endif
}