quoted

6674:   while (atomic_read(&j->DSPWrite) > 0)
6675-           atomic_dec(&j->DSPWrite);

If the maintainer of this code doesn't see a compelling reason to add 
cpu_relax() in this loop, then it should be patched.

Shouldn't it be just re-written without the loop:

	if ((tmp = atomic_read(&j->DSPWrite)) > 0)
		atomic_sub(&j->DSPWrite, tmp);

Has all the same bugs, but runs much faster :-)

-Tony