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authorBen Hutchings <ben@decadent.org.uk>2014-05-19 01:03:06 +0100
committerShow Liu <show.liu@linaro.org>2014-06-18 12:05:27 +0800
commit68e5d68797d52c60341e6243b3b0094f96e628b3 (patch)
treef29c49c56eb08863ac702d6135b3306eebbdcac0 /drivers
parentc34c739700f311d2ff1fb765e2407a69f91abda4 (diff)
downloadlinaro-lsk-68e5d68797d52c60341e6243b3b0094f96e628b3.tar.gz
Staging: speakup: Update __speakup_paste_selection() tty (ab)usage to match vt
commit 28a821c306889b9f2c3fff49abedc9b2c743eb73 upstream. This function is largely a duplicate of paste_selection() in drivers/tty/vt/selection.c, but with its own selection state. The speakup selection mechanism should really be merged with vt. For now, apply the changes from 'TTY: vt, fix paste_selection ldisc handling', 'tty: Make ldisc input flow control concurrency-friendly', and 'tty: Fix unsafe vt paste_selection()'. References: https://bugs.debian.org/735202 References: https://bugs.debian.org/744015 Reported-by: Paul Gevers <elbrus@debian.org> Reported-and-tested-by: Jarek Czekalski <jarekczek@poczta.onet.pl> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/staging/speakup/selection.c14
-rw-r--r--drivers/tty/tty_buffer.c2
2 files changed, 13 insertions, 3 deletions
diff --git a/drivers/staging/speakup/selection.c b/drivers/staging/speakup/selection.c
index f67941e78e4..ca04d3669ac 100644
--- a/drivers/staging/speakup/selection.c
+++ b/drivers/staging/speakup/selection.c
@@ -5,6 +5,8 @@
#include <linux/device.h> /* for dev_warn */
#include <linux/selection.h>
#include <linux/workqueue.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
#include <asm/cmpxchg.h>
#include "speakup.h"
@@ -135,8 +137,12 @@ static void __speakup_paste_selection(struct work_struct *work)
struct tty_struct *tty = xchg(&spw->tty, NULL);
struct vc_data *vc = (struct vc_data *) tty->driver_data;
int pasted = 0, count;
+ struct tty_ldisc *ld;
DECLARE_WAITQUEUE(wait, current);
+ ld = tty_ldisc_ref_wait(tty);
+ tty_buffer_lock_exclusive(&vc->port);
+
add_wait_queue(&vc->paste_wait, &wait);
while (sel_buffer && sel_buffer_lth > pasted) {
set_current_state(TASK_INTERRUPTIBLE);
@@ -145,13 +151,15 @@ static void __speakup_paste_selection(struct work_struct *work)
continue;
}
count = sel_buffer_lth - pasted;
- count = min_t(int, count, tty->receive_room);
- tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted,
- NULL, count);
+ count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
+ count);
pasted += count;
}
remove_wait_queue(&vc->paste_wait, &wait);
current->state = TASK_RUNNING;
+
+ tty_buffer_unlock_exclusive(&vc->port);
+ tty_ldisc_deref(ld);
tty_kref_put(tty);
}
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index cf78d1985cd..143deb62467 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -60,6 +60,7 @@ void tty_buffer_lock_exclusive(struct tty_port *port)
atomic_inc(&buf->priority);
mutex_lock(&buf->lock);
}
+EXPORT_SYMBOL_GPL(tty_buffer_lock_exclusive);
void tty_buffer_unlock_exclusive(struct tty_port *port)
{
@@ -73,6 +74,7 @@ void tty_buffer_unlock_exclusive(struct tty_port *port)
if (restart)
queue_work(system_unbound_wq, &buf->work);
}
+EXPORT_SYMBOL_GPL(tty_buffer_unlock_exclusive);
/**
* tty_buffer_space_avail - return unused buffer space