4 files changed, 21 insertions, 16 deletions

diff --git a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c
index 965cfdb84ebc..c19f23267157 100644
--- a/drivers/ieee1394/dv1394.c
+++ b/drivers/ieee1394/dv1394.c
@@ -1270,8 +1270,14 @@ static int dv1394_mmap(struct file *file, struct vm_area_struct *vma)
 	struct video_card *video = file_to_video_card(file);
 	int retval = -EINVAL;
 
-	/* serialize mmap */
-	mutex_lock(&video->mtx);
+	/*
+	 * We cannot use the blocking variant mutex_lock here because .mmap
+	 * is called with mmap_sem held, while .ioctl, .read, .write acquire
+	 * video->mtx and subsequently call copy_to/from_user which will
+	 * grab mmap_sem in case of a page fault.
+	 */
+	if (!mutex_trylock(&video->mtx))
+		return -EAGAIN;
 
 	if ( ! video_card_initialized(video) ) {
 		retval = do_dv1394_init_default(video);
diff --git a/drivers/ieee1394/hosts.c b/drivers/ieee1394/hosts.c
index 8dd09d850419..237d0c9d69c6 100644
--- a/drivers/ieee1394/hosts.c
+++ b/drivers/ieee1394/hosts.c
@@ -155,11 +155,11 @@ struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
 	memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
 	h->device.parent = dev;
 	set_dev_node(&h->device, dev_to_node(dev));
-	snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
+	dev_set_name(&h->device, "fw-host%d", h->id);
 
 	h->host_dev.parent = &h->device;
 	h->host_dev.class = &hpsb_host_class;
-	snprintf(h->host_dev.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
+	dev_set_name(&h->host_dev, "fw-host%d", h->id);
 
 	if (device_register(&h->device))
 		goto fail;
diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c
index 2376b729e876..9e39f73282ee 100644
--- a/drivers/ieee1394/nodemgr.c
+++ b/drivers/ieee1394/nodemgr.c
@@ -826,13 +826,11 @@ static struct node_entry *nodemgr_create_node(octlet_t guid,
 	memcpy(&ne->device, &nodemgr_dev_template_ne,
 	       sizeof(ne->device));
 	ne->device.parent = &host->device;
-	snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
-		 (unsigned long long)(ne->guid));
+	dev_set_name(&ne->device, "%016Lx", (unsigned long long)(ne->guid));
 
 	ne->node_dev.parent = &ne->device;
 	ne->node_dev.class = &nodemgr_ne_class;
-	snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
-		(unsigned long long)(ne->guid));
+	dev_set_name(&ne->node_dev, "%016Lx", (unsigned long long)(ne->guid));
 
 	if (device_register(&ne->device))
 		goto fail_devreg;
@@ -932,13 +930,11 @@ static void nodemgr_register_device(struct node_entry *ne,
 
 	ud->device.parent = parent;
 
-	snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
-		 ne->device.bus_id, ud->id);
+	dev_set_name(&ud->device, "%s-%u", dev_name(&ne->device), ud->id);
 
 	ud->unit_dev.parent = &ud->device;
 	ud->unit_dev.class = &nodemgr_ud_class;
-	snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
-		 ne->device.bus_id, ud->id);
+	dev_set_name(&ud->unit_dev, "%s-%u", dev_name(&ne->device), ud->id);
 
 	if (device_register(&ud->device))
 		goto fail_devreg;
@@ -953,7 +949,7 @@ static void nodemgr_register_device(struct node_entry *ne,
 fail_classdevreg:
 	device_unregister(&ud->device);
 fail_devreg:
-	HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
+	HPSB_ERR("Failed to create unit %s", dev_name(&ud->device));
 }	
 
 
diff --git a/drivers/ieee1394/raw1394.c b/drivers/ieee1394/raw1394.c
index 9f19ac492106..bf7e761c12b1 100644
--- a/drivers/ieee1394/raw1394.c
+++ b/drivers/ieee1394/raw1394.c
@@ -2268,7 +2268,8 @@ static ssize_t raw1394_write(struct file *file, const char __user * buffer,
 		return -EFAULT;
 	}
 
-	mutex_lock(&fi->state_mutex);
+	if (!mutex_trylock(&fi->state_mutex))
+		return -EAGAIN;
 
 	switch (fi->state) {
 	case opened:
@@ -2548,7 +2549,8 @@ static int raw1394_mmap(struct file *file, struct vm_area_struct *vma)
 	struct file_info *fi = file->private_data;
 	int ret;
 
-	mutex_lock(&fi->state_mutex);
+	if (!mutex_trylock(&fi->state_mutex))
+		return -EAGAIN;
 
 	if (fi->iso_state == RAW1394_ISO_INACTIVE)
 		ret = -EINVAL;
@@ -2669,7 +2671,8 @@ static long raw1394_ioctl(struct file *file, unsigned int cmd,
 		break;
 	}
 
-	mutex_lock(&fi->state_mutex);
+	if (!mutex_trylock(&fi->state_mutex))
+		return -EAGAIN;
 
 	switch (fi->iso_state) {
 	case RAW1394_ISO_INACTIVE: