Hi, Ming Lei made me look. I found a scenario I don't like. Suppose we have a device with two interfaces #1 and #0 Let #1 be storage and #0 be vendor specific and the skeleton driver bound to it.
CPU A
CPU B
skel_read()
mutex_lock_interruptible(&dev->io_mutex)
copy_to_user(...)
page fault
schedule reading a page from interface #0
usb_stor_port_reset()
usb_reset_device()
drv->pre_reset()
skel_pre_reset()
mutex_lock(&dev->io_mutex)
Contrary to the usual scenario you don't need writable mmap. In fact it could
happen with a scratched CD.
What do you think?
Regards
Oliver
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