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NTB: ntb_transport: Free MWs in ntb_transport_link_cleanup() 

If NTB peer host crashes or reboots, the NTB transport link will be
down and the MWs of NTB transport will be invalid. But the
ntb_transport_link_cleanup() does not free these invalid MWs. When
the NTB peer host is recovered later, NTB transport link will be
up and the ntb_set_mw() will not reset up MWs. Because the MWs of
NTB transport are invalid, the NTB transport will not work.

We can fix it by freeing MWs when NTB transport link is down, then
the ntb_set_mw() will reset up MWs when NTB transport link is up.

Signed-off-by: Joey Zhang <joey.zhang@microchip.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Joey Zhang 2019-01-07 11:12:56 +08:00 committed by Jon Mason
parent a2585cdc9e
commit 9143595a7e
1 changed files with 3 additions and 0 deletions
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3
drivers/ntb/ntb_transport.c
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@ -862,6 +862,9 @@ static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt)
if (!nt->link_is_up)
cancel_delayed_work_sync(&nt->link_work);
for (i = 0; i < nt->mw_count; i++)
ntb_free_mw(nt, i);
/* The scratchpad registers keep the values if the remote side
* goes down, blast them now to give them a sane value the next
* time they are accessed