diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index f365ecb..f0de7b8 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -419,7 +419,9 @@
 		dev_dbg(&s->dev, "IRQ attributes must match assigned ones\n");
 		return -EINVAL;
 	}
+	mutex_lock(&s->ops_mutex);
 	if (s->irq.AssignedIRQ != req->AssignedIRQ) {
+		mutex_unlock(&s->ops_mutex);
 		dev_dbg(&s->dev, "IRQ must match assigned one\n");
 		return -EINVAL;
 	}
@@ -434,6 +436,7 @@
 #ifdef CONFIG_PCMCIA_PROBE
 	pcmcia_used_irq[req->AssignedIRQ]--;
 #endif
+	mutex_unlock(&s->ops_mutex);
 
 	return 0;
 } /* pcmcia_release_irq */
diff --git a/drivers/pcmcia/socket_sysfs.c b/drivers/pcmcia/socket_sysfs.c
index 537d793..1cba9d3 100644
--- a/drivers/pcmcia/socket_sysfs.c
+++ b/drivers/pcmcia/socket_sysfs.c
@@ -167,7 +167,9 @@
 	ret = sscanf(buf, "0x%x\n", &mask);
 
 	if (ret == 1) {
+		mutex_lock(&s->ops_mutex);
 		s->irq_mask &= mask;
+		mutex_unlock(&s->ops_mutex);
 		ret = 0;
 	}