Hi Albert,
On 06/27/2013 12:11 PM, Albert ARIBAUD wrote:
>> while playing with dfu, I tapped in an unaligned access
>> when doing on the host side a "lsusb -d [vendornr]: -v"
>> I get on the board:
>>
>> GADGET DRIVER: usb_dnl_dfu
>> data abort
>>
>> MAYBE you should read doc/README.arm-unaligned-accesses
>>
>> pc : [<8ff71db8>] lr : [<8ff75aec>]
>> sp : 8ef40d18 ip : 00000005 fp : 00000000
>> r10: 00000000 r9 : 47401410 r8 : 8ef40f38
>> r7 : 8ef4aae8 r6 : 0000000a r5 : 8ef4ab28 r4 : 8ef4ab80
>> r3 : 0000000a r2 : 00000006 r1 : 00000006 r0 : 8ef4aae8
>> Flags: Nzcv IRQs off FIQs on Mode SVC_32
>> Resetting CPU ...
>>
>> reason is that in the "struct usb_composite_dev" the
>> "struct usb_device_descriptor desc;" is on an odd address,
>> and this struct gets accessed in
>> drivers/usb/gadget/composite.c device_qual()
>>
>> Fix it, by align this var "struct desc" fix to an aligned
>> address.
>
> Please keep the commit message to a minimum -- what is wrong and how it
> is fixed -- and move the rest (context and additional details) after
> the commit message separator ('---' below).
I personally find this expanded description quite helpful. Everything
below the "---" line is removed from the git history. So +1 for this
expanded description from me.
Thanks,
Stefan
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