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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 /drivers/char/ip2
parentb07471fa51358ce64cc25e1501544502362e4404 (diff)
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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>
Diffstat (limited to 'drivers/char/ip2')
-rw-r--r--drivers/char/ip2/ip2main.c4
1 files changed, 4 insertions, 0 deletions
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);