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authorAlan Cox <alan@redhat.com>2008-08-04 17:47:07 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-04 17:12:07 -0700
commitd5cae364148088911bdf007a8aaefb46a92f16f7 (patch)
tree7dc6d3d99f4a056ff9efed96fea61ff54acab046
parentd7283353221e73a793847252d063ff9186885160 (diff)
vt: Deadlock workaround
2.6.26 corrected the mutex locking on tty resizing to fix the case where you could get the tty/vt sizing out of sync. That turns out to have a deadlock. The actual fix is really major and I've got it lined up as part of the ops changes for 2.6.28 so for 2.6.26/2.6.27 it is safer to reintroduce this ages old minor bug. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/char/vt.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 82a51f38a546..1bc00c9d860d 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -916,7 +916,6 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
ws.ws_col = vc->vc_cols;
ws.ws_ypixel = vc->vc_scan_lines;
- mutex_lock(&vc->vc_tty->termios_mutex);
spin_lock_irq(&vc->vc_tty->ctrl_lock);
if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col))
pgrp = get_pid(vc->vc_tty->pgrp);
@@ -926,7 +925,6 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
put_pid(pgrp);
}
*cws = ws;
- mutex_unlock(&vc->vc_tty->termios_mutex);
}
if (CON_IS_VISIBLE(vc))