n_gsm.c: add tx_lock in gsm_send
All the call to gsm->output should be in the tx_lock,
that could avoid potential race from MUX level. But
we have no tx_lock in gsm_send.
This patch is to add tx_lock in gsm_send.
Signed-off-by: xiaojin <jin.xiao@intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index dcc0430..4572117 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -573,6 +573,7 @@
int len;
u8 cbuf[10];
u8 ibuf[3];
+ unsigned long flags;
switch (gsm->encoding) {
case 0:
@@ -602,7 +603,9 @@
WARN_ON(1);
return;
}
+ spin_lock_irqsave(&gsm->tx_lock, flags);
gsm->output(gsm, cbuf, len);
+ spin_unlock_irqrestore(&gsm->tx_lock, flags);
gsm_print_packet("-->", addr, cr, control, NULL, 0);
}