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 <[EMAIL PROTECTED]>
---
Greg, I would like this fix pushed to Linus with a bugfix priority. It is
independent of other ub patches you may have, and should not conflict.
Please let me know if anything fails, I'll check it promptly.
Thanks,
Pete
diff -urp -X dontdiff linux-2.6.17-rc2/drivers/block/ub.c
linux-2.6.17-rc2-lem/drivers/block/ub.c
--- linux-2.6.17-rc2/drivers/block/ub.c 2006-04-23 21:05:39.000000000 -0700
+++ linux-2.6.17-rc2-lem/drivers/block/ub.c 2006-05-02 23:37:32.000000000
-0700
@@ -536,6 +532,9 @@ 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 +2187,12 @@ static int ub_probe(struct usb_interface
// 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 +2258,7 @@ static int ub_probe(struct usb_interface
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 +2433,6 @@ static void ub_disconnect(struct usb_int
* 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);
}
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