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| author | Paul Mackerras <paulus@samba.org> | 2012-11-14 19:15:47 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-14 12:27:29 -0800 |
| commit | c019bc119a97aa20372c5a2cf210d209380d397d (patch) | |
| tree | 176544a310cd9c97589a9aa6484d2a37558cd3f2 /drivers/tty/hvc | |
| parent | 77b67063bb6bce6d475e910d3b886a606d0d91f7 (diff) | |
| download | kernel-common-c019bc119a97aa20372c5a2cf210d209380d397d.tar.gz kernel-common-c019bc119a97aa20372c5a2cf210d209380d397d.tar.bz2 kernel-common-c019bc119a97aa20372c5a2cf210d209380d397d.zip | |
TTY: hvc_console, fix port reference count going to zero prematurely
Commit bdb498c20040 "TTY: hvc_console, add tty install" took the port
refcounting out of hvc_open()/hvc_close(), but failed to remove the
kref_put() and tty_kref_put() calls in hvc_hangup() that were there to
remove the extra references that hvc_open() had taken.
The result was that doing a vhangup() when the current terminal was
a hvc_console, then closing the current terminal, would end up calling
destroy_hvc_struct() and making the port disappear entirely. This
meant that Fedora 17 systems would boot up but then not display the
login prompt on the console, and attempts to open /dev/hvc0 would
give a "No such device" error.
This fixes it by removing the extra kref_put() and tty_kref_put() calls.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/hvc')
| -rw-r--r-- | drivers/tty/hvc/hvc_console.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c index a5dec1ca1b82..13ee53bd0bf6 100644 --- a/drivers/tty/hvc/hvc_console.c +++ b/drivers/tty/hvc/hvc_console.c @@ -424,7 +424,6 @@ static void hvc_hangup(struct tty_struct *tty) { struct hvc_struct *hp = tty->driver_data; unsigned long flags; - int temp_open_count; if (!hp) return; @@ -444,7 +443,6 @@ static void hvc_hangup(struct tty_struct *tty) return; } - temp_open_count = hp->port.count; hp->port.count = 0; spin_unlock_irqrestore(&hp->port.lock, flags); tty_port_tty_set(&hp->port, NULL); @@ -453,11 +451,6 @@ static void hvc_hangup(struct tty_struct *tty) if (hp->ops->notifier_hangup) hp->ops->notifier_hangup(hp, hp->data); - - while(temp_open_count) { - --temp_open_count; - tty_port_put(&hp->port); - } } /* |