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NTB: ntb_perf: Clear stale values in doorbell and command SPAD register 

when ntb_perf is unloaded, the command scratchpad register still
retains the last initialized value of PERF_CMD_INVAL. When ntb_perf
is re-loaded and reads peer command scratchpad register and it mis
interprets the peer state as initialized.

To avoid this, clearing the local side command scratchpad register
in perf_disable_service

Signed-off-by: Sanjay R Mehta <sanju.mehta@amd.com>
Acked-by: Allen Hubbe <allenbh@gmail.com>
Acked-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Sanjay R Mehta 2019-02-15 09:21:19 +00:00 committed by Jon Mason
parent b1ee5998a5
commit 12c023d7c3
1 changed files with 8 additions and 0 deletions
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8
drivers/ntb/test/ntb_perf.c
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@ -751,6 +751,14 @@ static void perf_disable_service(struct perf_ctx *perf)
for (pidx = 0; pidx < perf->pcnt; pidx++)
flush_work(&perf->peers[pidx].service);
for (pidx = 0; pidx < perf->pcnt; pidx++) {
struct perf_peer *peer = &perf->peers[pidx];
ntb_spad_write(perf->ntb, PERF_SPAD_CMD(peer->gidx), 0);
}
ntb_db_clear(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx));
ntb_link_disable(perf->ntb);
}