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authorArnd Bergmann <arnd@arndb.de>2010-06-01 22:53:10 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-10 13:47:44 -0700
commite142a31da34b42458e10026b554e66127739cf23 (patch)
tree1f65a42cd559116223e1fa1db7631cd449c73968
parentb07471fa51358ce64cc25e1501544502362e4404 (diff)
tty: release BTM while sleeping in block_til_ready
Most tty drivers may block while opening a device. Since this possibly depends on another thread closing it first and both threads may need the BTM, we need to release it here. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/char/amiserial.c2
-rw-r--r--drivers/char/ip2/ip2main.c4
-rw-r--r--drivers/char/serial167.c4
-rw-r--r--drivers/char/specialix.c2
-rw-r--r--drivers/char/synclink.c2
-rw-r--r--drivers/char/synclink_gt.c2
-rw-r--r--drivers/char/synclinkmp.c2
-rw-r--r--drivers/char/tty_port.c2
-rw-r--r--drivers/serial/68328serial.c2
-rw-r--r--drivers/serial/68360serial.c2
-rw-r--r--drivers/serial/crisv10.c2
11 files changed, 25 insertions, 1 deletions
diff --git a/drivers/char/amiserial.c b/drivers/char/amiserial.c
index 8228e61bb54..a11c8c9ca3d 100644
--- a/drivers/char/amiserial.c
+++ b/drivers/char/amiserial.c
@@ -1710,7 +1710,9 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
printk("block_til_ready blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
+ tty_unlock();
schedule();
+ tty_lock();
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
diff --git a/drivers/char/ip2/ip2main.c b/drivers/char/ip2/ip2main.c
index 911e1da6def..07f3ea38b58 100644
--- a/drivers/char/ip2/ip2main.c
+++ b/drivers/char/ip2/ip2main.c
@@ -1486,7 +1486,9 @@ ip2_open( PTTY tty, struct file *pFile )
if ( tty_hung_up_p(pFile) || ( pCh->flags & ASYNC_CLOSING )) {
if ( pCh->flags & ASYNC_CLOSING ) {
+ tty_unlock();
schedule();
+ tty_lock();
}
if ( tty_hung_up_p(pFile) ) {
set_current_state( TASK_RUNNING );
@@ -1548,7 +1550,9 @@ ip2_open( PTTY tty, struct file *pFile )
rc = (( pCh->flags & ASYNC_HUP_NOTIFY ) ? -EAGAIN : -ERESTARTSYS);
break;
}
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state( TASK_RUNNING );
remove_wait_queue(&pCh->open_wait, &wait);
diff --git a/drivers/char/serial167.c b/drivers/char/serial167.c
index 90b3ec0aabd..f646725bd56 100644
--- a/drivers/char/serial167.c
+++ b/drivers/char/serial167.c
@@ -1786,7 +1786,9 @@ block_til_ready(struct tty_struct *tty, struct file *filp,
tty->name, info->count);
/**/
#endif
- schedule();
+ tty_unlock();
+ schedule();
+ tty_lock();
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
diff --git a/drivers/char/specialix.c b/drivers/char/specialix.c
index 7be456f760c..9f8495b4fc8 100644
--- a/drivers/char/specialix.c
+++ b/drivers/char/specialix.c
@@ -1365,7 +1365,9 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
retval = -ERESTARTSYS;
break;
}
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state(TASK_RUNNING);
diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index 2b03d4d4735..a2a58004e18 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -3349,7 +3349,9 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
printk("%s(%d):block_til_ready blocking on %s count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state(TASK_RUNNING);
diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 5a602eb7cd2..fef80cfcab5 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -3244,7 +3244,9 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
}
DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state(TASK_RUNNING);
diff --git a/drivers/char/synclinkmp.c b/drivers/char/synclinkmp.c
index ac447c7eb57..e56caf7d82a 100644
--- a/drivers/char/synclinkmp.c
+++ b/drivers/char/synclinkmp.c
@@ -3365,7 +3365,9 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
printk("%s(%d):%s block_til_ready() count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state(TASK_RUNNING);
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 35eb30402f1..33d37d230f8 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -294,7 +294,9 @@ int tty_port_block_til_ready(struct tty_port *port,
retval = -ERESTARTSYS;
break;
}
+ tty_unlock();
schedule();
+ tty_lock();
}
finish_wait(&port->open_wait, &wait);
diff --git a/drivers/serial/68328serial.c b/drivers/serial/68328serial.c
index 9330edb323e..d8204f4ebbb 100644
--- a/drivers/serial/68328serial.c
+++ b/drivers/serial/68328serial.c
@@ -1235,7 +1235,9 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
retval = -ERESTARTSYS;
break;
}
+ tty_unlock();
schedule();
+ tty_lock();
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);
diff --git a/drivers/serial/68360serial.c b/drivers/serial/68360serial.c
index edcf1cc089d..0dff3bbddc8 100644
--- a/drivers/serial/68360serial.c
+++ b/drivers/serial/68360serial.c
@@ -1860,7 +1860,9 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
printk("block_til_ready blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
+ tty_unlock();
schedule();
+ tty_lock();
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);
diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index 8e356c5eeae..5696710b6f2 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -4066,7 +4066,9 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
printk("block_til_ready blocking: ttyS%d, count = %d\n",
info->line, info->count);
#endif
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);