fsi: master-gpio: Add locking during break and link enable

Currently, we perform GPIO accesses in fsi_master_gpio_break and
fsi_master_link_enable, without holding cmd_lock. This change adds the
appropriate locking.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Christopher Bostic <clbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/fsi/fsi-master-gpio.c

@@ -461,12 +461,14 @@ static int fsi_master_gpio_term(struct fsi_master *_master,
 static int fsi_master_gpio_break(struct fsi_master *_master, int link)
 {
 	struct fsi_master_gpio *master = to_fsi_master_gpio(_master);
+	unsigned long flags;
 
 	if (link != 0)
 		return -ENODEV;
 
 	trace_fsi_master_gpio_break(master);
 
+	spin_lock_irqsave(&master->cmd_lock, flags);
 	set_sda_output(master, 1);
 	sda_out(master, 1);
 	clock_toggle(master, FSI_PRE_BREAK_CLOCKS);
@@ -475,6 +477,7 @@ static int fsi_master_gpio_break(struct fsi_master *_master, int link)
 	echo_delay(master);
 	sda_out(master, 1);
 	clock_toggle(master, FSI_POST_BREAK_CLOCKS);
+	spin_unlock_irqrestore(&master->cmd_lock, flags);
 
 	/* Wait for logic reset to take effect */
 	udelay(200);
@@ -497,10 +500,14 @@ static void fsi_master_gpio_init(struct fsi_master_gpio *master)
 static int fsi_master_gpio_link_enable(struct fsi_master *_master, int link)
 {
 	struct fsi_master_gpio *master = to_fsi_master_gpio(_master);
+	unsigned long flags;
 
 	if (link != 0)
 		return -ENODEV;
+
+	spin_lock_irqsave(&master->cmd_lock, flags);
 	gpiod_set_value(master->gpio_enable, 1);
+	spin_unlock_irqrestore(&master->cmd_lock, flags);
 
 	return 0;
 }