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: