Messages in this thread | | | Date | Mon, 12 Mar 2007 17:41:42 -0700 | From | Jim Radford <> | Subject | Re: [PATCH] usb-serial regression fix |
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On Mon, Mar 12, 2007 at 05:18:19PM -0700, Greg KH wrote: > On Mon, Mar 12, 2007 at 03:59:22PM -0700, Jim Radford wrote: > > On Mon, Mar 12, 2007 at 03:42:35PM -0700, Jim Radford wrote: > > > On Mon, Mar 12, 2007 at 01:33:31PM -0700, Greg KH wrote: > > > > On Mon, Mar 12, 2007 at 04:22:22PM -0400, Mark Lord wrote: > > > > > Oliver Neukum wrote: > > > > > > >Mark Lord wrote: > > > > > > > >Okay, from that part (above), the problem is obvious: > > > > > > > >in that the "MCT U232 converter now disconnected" > > > > > > > >appears, and then we continue to try and call the > > > > > > > >driver's method.. Oops!
> > > > > >IMHO shutdown() is using serial->port[] and bombs. > > > > > >Could you reverse the order here?
> > Do not NULL serial->port[i] since it is used in ->shutdown(). > > This wasn't an issue until the order or ->shutdown() and > > device_unregister was corrected.
> > for (i = 0; i < serial->num_ports; ++i) > > if (serial->port[i]->dev.parent != NULL) { > > device_unregister(&serial->port[i]->dev); > > - serial->port[i] = NULL; > > }
> But shouldn't you null it out somewhere? It will be an "empty" > pointer at some point in time...
Not as far as I can see. The serial structure that ->port[i] is in gets kfree()ed soon after, in the same function, and nothing in between, other than ->shutdown(), uses ->port[]. I assume it was someone being overly cautious.
-Jim - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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