linux-kernel - Re: [PATCH] usb: gadget: f_fs: Fix kernel panic for SuperSpeed

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Date:	Wed, 04 May 2016 13:37:31 +0300
From:	Felipe Balbi <balbi@...nel.org>
To:	Jim Lin <jilin@...dia.com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: f_fs: Fix kernel panic for SuperSpeed


Hi,

Jim Lin <jilin@...dia.com> writes:

<snip>

>>> In f_fs.c
>>> "
>>> static int __ffs_data_do_os_desc(enum ffs_os_desc_type type,
>>>                    struct usb_os_desc_header *h, void *data,
>>>                    unsigned len, void *priv)
>>> {
>>>       struct ffs_data *ffs = priv;
>>>       u8 length;
>>>
>>>       ENTER();
>>>
>>>       switch (type) {
>>>       case FFS_OS_DESC_EXT_COMPAT: {
>>>           struct usb_ext_compat_desc *d = data;
>>>           int i;
>>>
>>>           if (len < sizeof(*d) ||
>>>               d->bFirstInterfaceNumber >= ffs->interfaces_count ||
>>>               d->Reserved1)
>>>               return -EINVAL;
>>> "
>> that's fine, but this is only failing because something else is
>> returning the wrong set of descriptors (SS vs HS). That's the bug we
>> want to fix, not work around it.
>>
> Thanks.

you're welcome, but to fix that bug we need more information. Why is
composite.c using the wrong set of descriptors ? What is your setup ?

Are you using an in-kernel gadget ? which one ? Using configfs or legacy
gadgets ? gadgetfs ? f_fs ? How to trigger this ? Can you provide
instructions and (in case of gadgetfs/ffs) code to create a gadget that
hits this problem ?

-- 
balbi

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