USB: io_ti: lock mcr and msr shadows properly
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index 63e044a..39d71fd 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -2559,9 +2559,11 @@
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
unsigned int mcr;
+ unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
+ spin_lock_irqsave(&edge_port->ep_lock, flags);
mcr = edge_port->shadow_mcr;
if (set & TIOCM_RTS)
mcr |= MCR_RTS;
@@ -2578,6 +2580,7 @@
mcr &= ~MCR_LOOPBACK;
edge_port->shadow_mcr = mcr;
+ spin_unlock_irqrestore(&edge_port->ep_lock, flags);
TIRestoreMCR (edge_port, mcr);
@@ -2590,9 +2593,12 @@
unsigned int result = 0;
unsigned int msr;
unsigned int mcr;
+ unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
+ spin_lock_irqsave(&edge_port->ep_lock, flags);
+
msr = edge_port->shadow_msr;
mcr = edge_port->shadow_mcr;
result = ((mcr & MCR_DTR) ? TIOCM_DTR: 0) /* 0x002 */
@@ -2604,6 +2610,7 @@
dbg("%s -- %x", __FUNCTION__, result);
+ spin_unlock_irqrestore(&edge_port->ep_lock, flags);
return result;
}