> is there a host adapter which might need to allocate memory to unlink an URB ?
I'd think not, but you'd have to analyse them all to be sure.
Unlinking an URB is basically a job of finding the associated transfer
in the HC data structures, making the HC forget about it, and then
deleting the HC-private data structures associated with the URB.
There's no fundamental reason to need to allocate memory doing
any of that.
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