RDMA/siw: Fix SQ/RQ drain logic

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Storage ULPs (e.g. iSER & NVMeOF) use ib_drain_qp() to drain
QP/CQ. Current SIW's own drain routines do not properly wait until all
SQ/RQ elements are completed and reaped from the CQ. This may cause touch
after free issues.  New logic relies on generic
__ib_drain_sq()/__ib_drain_rq() posting a final work request, which SIW
immediately flushes to CQ.

Fixes: 303ae1cdfd ("rdma/siw: application interface")
Link: https://lore.kernel.org/r/20191004125356.20673-1-bmt@zurich.ibm.com
Signed-off-by: Krishnamraju Eraparaju <krishna2@chelsio.com>
Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

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Bernard Metzler 2019-10-04 14:53:56 +02:00 • committed by Jason Gunthorpe

parent 5a0d523781

commit cf049bb31f

2 changed files with 122 additions and 42 deletions

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20

drivers/infiniband/sw/siw/siw_main.c

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144

drivers/infiniband/sw/siw/siw_verbs.c

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