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Commit f96f7f7f authored by xiaojin's avatar xiaojin Committed by Greg Kroah-Hartman
Browse files

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: default avatarxiaojin <jin.xiao@intel.com>
Acked-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5425e03f

drivers/tty/n_gsm.c

+3 −0
Original line number Diff line number Diff line
@@ -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);

}