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authorSamuel Iglesias Gonsalvez <siglesias@igalia.com>2012-12-10 11:50:05 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-15 18:24:38 -0800
commite7e664fd688a4a882ce571575ad721203f0cd584 (patch)
tree4acbf6cde6898c71af252673db206ca12658f4fe /drivers/ipack
parent21d27ed4616c9a7f2886c4159b4c409f73f96e76 (diff)
downloadlinux-e7e664fd688a4a882ce571575ad721203f0cd584.tar.gz
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 <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/ipack')
-rw-r--r--drivers/ipack/devices/ipoctal.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c
index 9cd5572457f..5ce2c4c5bb3 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)