[stable 4.7] xprtrdma: Create common scatterlist fields in rpcrdma_mw

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Sending again. I have not received ACK/NAK after 1 week.

Please cherry-pick this commit for v4.7 stable:

commit 564471d2f2f1ddaf02119b8759813666db93abba
Author:     Chuck Lever <chuck.lever@xxxxxxxxxx>
AuthorDate: Wed Jun 29 13:52:21 2016 -0400
Commit:     Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
CommitDate: Mon Jul 11 15:50:43 2016 -0400

   xprtrdma: Create common scatterlist fields in rpcrdma_mw


It addresses a bug in:

commit d7a21c1bed54adcf96e1713019a6ad87e90fbbc3
Author:     Chuck Lever <chuck.lever@xxxxxxxxxx>
AuthorDate: Mon May 2 14:42:12 2016 -0400
Commit:     Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
CommitDate: Tue May 17 15:48:02 2016 -0400

   xprtrdma: Reset MRs in frwr_op_unmap_sync()

Which causes DMAR errors and an oops when using NFS/RDMA on
x86_64 systems where the iommu is enabled.

This was reported via IRC, I don't have the reporter's e-mail
address. I was able to reproduce the issue, and confirm that
564471d2f2f1 fixes the problem on v4.7.2.

(The actual fix is just two lines in that commit).

--
Chuck Lever



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