Messages in this thread | | | Date | Mon, 12 Mar 2007 13:33:31 -0700 | From | Greg KH <> | Subject | Re: [PATCH] usb-serial regression (Oops) in 2.6.21-rc* |
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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? > > Yup. Fixed. Tested. Works. > > This patch fixes the Oops that otherwise occurs whenever > a USB serial adapter is unplugged from a system, as well > the Oops seen when one is in use before resume (to RAM). > > GregKH: This needs to go into 2.6.21-rc*. > > Signed-off-by: Mark Lord <mlord@pobox.com> > --- > --- 2.6.21-rc3/drivers/usb/serial/usb-serial.c 2007-03-12 > 11:22:43.000000000 -0400 > +++ linux/drivers/usb/serial/usb-serial.c 2007-03-12 > 16:12:53.000000000 -0400 > @@ -141,6 +141,9 @@ > for (i = 0; i < serial->num_ports; ++i) > serial->port[i]->open_count = 0; > > + if (serial->type->shutdown) > + serial->type->shutdown(serial); > + > /* the ports are cleaned up and released in port_release() */ > for (i = 0; i < serial->num_ports; ++i) > if (serial->port[i]->dev.parent != NULL) { > @@ -148,9 +151,6 @@ > serial->port[i] = NULL; > } > > - if (serial->type->shutdown) > - serial->type->shutdown(serial); > -
Argh, no, this change was done to help the ftdi drivers out.
Look at changeset d9a7ecacac5f8274d2afce09aadcf37bdb42b93a in Linus's tree from Jim Radford: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d9a7ecacac5f8274d2afce09aadcf37bdb42b93a
It makes this change because the usb-serial drivers need the port devices when the port_remove() callbacks happen. Otherwise you get an oops that way.
Jim, can you take a look at this and see if you can figure something out?
thanks,
greg k-h - 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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