From e7e664fd688a4a882ce571575ad721203f0cd584 Mon Sep 17 00:00:00 2001 From: Samuel Iglesias Gonsalvez Date: Mon, 10 Dec 2012 11:50:05 +0100 Subject: ipack/devices/ipoctal: protect the channel data processing with a spinlock We protect important data such as TX buffer pointer, nb_bytes counter and status registers of the device, from accessing several times at the same time. Signed-off-by: Samuel Iglesias Gonsalvez Signed-off-by: Greg Kroah-Hartman --- drivers/ipack/devices/ipoctal.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/ipack') diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c index 9cd5572457ff..5ce2c4c5bb32 100644 --- a/drivers/ipack/devices/ipoctal.c +++ b/drivers/ipack/devices/ipoctal.c @@ -191,6 +191,8 @@ static void ipoctal_irq_channel(struct ipoctal_channel *channel) tty = tty_port_tty_get(&channel->tty_port); if (!tty) return; + + spin_lock(&channel->lock); /* The HW is organized in pair of channels. See which register we need * to read from */ isr = ioread8(&channel->block_regs->r.isr); @@ -216,6 +218,7 @@ static void ipoctal_irq_channel(struct ipoctal_channel *channel) tty_flip_buffer_push(tty); tty_kref_put(tty); + spin_unlock(&channel->lock); } static irqreturn_t ipoctal_irq_handler(void *arg) -- cgit v1.2.3-59-g8ed1b