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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>
This commit is contained in:
xiaojin 2012-12-19 11:53:43 +08:00 committed by Greg Kroah-Hartman
parent 5425e03f97
commit f96f7f7f39
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/n_gsm.c
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@ -573,6 +573,7 @@ static void gsm_send(struct gsm_mux *gsm, int addr, int cr, int control)
int len;
u8 cbuf[10];
u8 ibuf[3];
unsigned long flags;
switch (gsm->encoding) {
case 0:
@ -602,7 +603,9 @@ static void gsm_send(struct gsm_mux *gsm, int addr, int cr, int control)
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);
}