The patch titled
vt: fix vc_resize locking
has been added to the -mm tree. Its filename is
vt-fix-vc_resize-locking.patch
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------------------------------------------------------
Subject: vt: fix vc_resize locking
From: Nick Piggin <npiggin@xxxxxxx>
Lockdep says we can't take tasklist lock or sighand lock inside ctrl_lock.
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Acked-by: Alan Cox <alan@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/char/vt.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff -puN drivers/char/vt.c~vt-fix-vc_resize-locking drivers/char/vt.c
--- a/drivers/char/vt.c~vt-fix-vc_resize-locking
+++ a/drivers/char/vt.c
@@ -909,7 +909,7 @@ int vc_resize(struct vc_data *vc, unsign
if (vc->vc_tty) {
struct winsize ws, *cws = &vc->vc_tty->winsize;
- unsigned long flags;
+ struct pid *pgrp = NULL;
memset(&ws, 0, sizeof(ws));
ws.ws_row = vc->vc_rows;
@@ -917,11 +917,14 @@ int vc_resize(struct vc_data *vc, unsign
ws.ws_ypixel = vc->vc_scan_lines;
mutex_lock(&vc->vc_tty->termios_mutex);
- spin_lock_irqsave(&vc->vc_tty->ctrl_lock, flags);
- if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
- vc->vc_tty->pgrp)
+ 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);
+ spin_unlock_irq(&vc->vc_tty->ctrl_lock);
+ if (pgrp) {
kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
- spin_unlock_irqrestore(&vc->vc_tty->ctrl_lock, flags);
+ put_pid(pgrp);
+ }
*cws = ws;
mutex_unlock(&vc->vc_tty->termios_mutex);
}
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
linux-next.patch
spufs-convert-nopfn-to-fault.patch
vt-fix-vc_resize-locking.patch
mspec-convert-nopfn-to-fault.patch
mspec-convert-nopfn-to-fault-fix.patch
mm-remove-nopfn.patch
mm-remove-double-indirection-on-tlb-parameter-to-free_pgd_range-co.patch
reiser4.patch
likeliness-accounting-change-and-cleanup.patch
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