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authorPete Zaitcev <zaitcev@redhat.com>2006-05-03 00:16:00 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2006-05-08 23:43:55 -0700
commit77ef6c4d6e23653a79eedacdd6d1d0da7083e59c (patch)
tree5dd68fb616175ffcf2939beaef8ed06a43179173 /drivers/block
parent436f5762bcd4929825a0725d4bc78337e6fc0d8f (diff)
[PATCH] USB: ub oops in block_uevent
In kernel 2.6.16, if a mounted storage device is removed, an oops happens because ub supplies an interface device (and kobject) to the block layer, but neglects to pin it. And apparently, the block layer expects its users to pin device structures. The code in ub was broken this way for years. But the bug was exposed only by 2.6.16 when it started to call block_uevent on close, which traverses device structures (kobjects actually). Signed-off-by: Pete Zaitcev <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/ub.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index f73446f580df..c688c25992e4 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -536,6 +536,9 @@ static void ub_cleanup(struct ub_dev *sc)
kfree(lun);
}
+ usb_set_intfdata(sc->intf, NULL);
+ usb_put_intf(sc->intf);
+ usb_put_dev(sc->dev);
kfree(sc);
}
@@ -2221,7 +2224,12 @@ static int ub_probe(struct usb_interface *intf,
// sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
usb_set_intfdata(intf, sc);
usb_get_dev(sc->dev);
- // usb_get_intf(sc->intf); /* Do we need this? */
+ /*
+ * Since we give the interface struct to the block level through
+ * disk->driverfs_dev, we have to pin it. Otherwise, block_uevent
+ * oopses on close after a disconnect (kernels 2.6.16 and up).
+ */
+ usb_get_intf(sc->intf);
snprintf(sc->name, 12, DRV_NAME "(%d.%d)",
sc->dev->bus->busnum, sc->dev->devnum);
@@ -2286,7 +2294,7 @@ static int ub_probe(struct usb_interface *intf,
err_dev_desc:
usb_set_intfdata(intf, NULL);
- // usb_put_intf(sc->intf);
+ usb_put_intf(sc->intf);
usb_put_dev(sc->dev);
kfree(sc);
err_core:
@@ -2461,12 +2469,6 @@ static void ub_disconnect(struct usb_interface *intf)
* and no URBs left in transit.
*/
- usb_set_intfdata(intf, NULL);
- // usb_put_intf(sc->intf);
- sc->intf = NULL;
- usb_put_dev(sc->dev);
- sc->dev = NULL;
-
ub_put(sc);
}