net/smc: use mutex instead of rwlock_t to protect buffers
The locks for sndbufs and rmbs are never used from atomic context. Using a mutex for these locks will allow to nest locks with other mutexes. Signed-off-by: NKarsten Graul <kgraul@linux.ibm.com> Reviewed-by: NUrsula Braun <ubraun@linux.ibm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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