On Wed, 26 Feb 2003, Oliver Graf wrote:
> Hi!
>
> On Thu, Feb 20, 2003 at 10:30:37PM +0100, Oliver Graf wrote:
> > The problem: a multi device usb card reader is correctly detected with
> > its four subdevices with kernel 2.4.19(-acX). But any patch after this
> > fails to detect the subdevices.
> >
> > Verbose output with 2.4.19-ac4 shows:
> > usb-storage: GetMaxLUN command result is 1, data is 3
> >
> > 2.4.21-pre4 gives:
> > usb-storage: GetMaxLUN command result is -32, data is 128
> > usb-storage: clearing endpoint halt for pipe 0x80000880
> >
> > I tried to find the parts that changed between the version, but it seems
> > not to be rooted in usb-storage.
> >
> > The call to usb_control_msg seems to timeout with the newer kernel
> > (just a wild guess!).
There was a change introduced around the time of 2.4.19-acX in the
usb_stor_Bulk_max_lun() routine, and the change had a bug in it. I don't
know if that bug was the source of Oliver's problem, but it is certainly
possible. Here is a patch to fix the bug.
Alan Stern
--- usb-2.4/drivers/usb/storage/transport.c.orig Wed Feb 26 09:54:43 2003
+++ usb-2.4/drivers/usb/storage/transport.c Wed Feb 26 09:55:23 2003
@@ -1054,7 +1054,7 @@
US_BULK_GET_MAX_LUN,
USB_DIR_IN | USB_TYPE_CLASS |
USB_RECIP_INTERFACE,
- 0, us->ifnum, data, sizeof(data), HZ);
+ 0, us->ifnum, data, sizeof(*data), HZ);
US_DEBUGP("GetMaxLUN command result is %d, data is %d\n",
result, *data);
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