ieee1394: dv1394: fix CardBus card ejection

Fix NULL pointer dereference on hot ejection of a FireWire card while
dv1394 was loaded.  http://bugzilla.kernel.org/show_bug.cgi?id=7121
I did not test card ejection with open /dev/dv1394 files yet.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

diff --git a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c
index 1084da4..d636cfa 100644 (file)
--- a/drivers/ieee1394/dv1394.c
+++ b/drivers/ieee1394/dv1394.c
@@ -2267,11 +2267,7 @@ static void dv1394_remove_host (struct hpsb_host *host)
 {
        struct video_card *video;
        unsigned long flags;
-       int id = host->id;
-
-       /* We only work with the OHCI-1394 driver */
-       if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
-               return;
+       int id = host->id, found_ohci_card = 0;
 
        /* find the corresponding video_cards */
        do {
@@ -2284,6 +2280,7 @@ static void dv1394_remove_host (struct hpsb_host *host)
                        if ((tmp_vid->id >> 2) == id) {
                                list_del(&tmp_vid->list);
                                video = tmp_vid;
+                               found_ohci_card = 1;
                                break;
                        }
                }
@@ -2293,8 +2290,9 @@ static void dv1394_remove_host (struct hpsb_host *host)
                        dv1394_un_init(video);
        } while (video != NULL);
 
-       class_device_destroy(hpsb_protocol_class,
-               MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2)));
+       if (found_ohci_card)
+               class_device_destroy(hpsb_protocol_class, MKDEV(IEEE1394_MAJOR,
+                          IEEE1394_MINOR_BLOCK_DV1394 * 16 + (host->id << 2)));
 }
 
 static void dv1394_add_host (struct hpsb_host *host)