RDMA/rxe: Fix race in rxe_mcast.c

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Fix a race in rxe_mcast.c that occurs when two QPs try at the same time to
attach a multicast address. Both QPs lookup the mgid address in a pool of
multicast groups and if they do not find it create a new group elem.

Fix this by locking the lookup/alloc/add key sequence and using the
unlocked APIs added in this patch set.

Link: https://lore.kernel.org/r/20201216231550.27224-8-rpearson@hpe.com
Signed-off-by: Bob Pearson <rpearson@hpe.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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Bob Pearson 2020-12-16 17:15:50 -06:00 • committed by Jason Gunthorpe

parent 3853c35e24

commit 8a48ac7f6c

1 changed files with 40 additions and 24 deletions

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drivers/infiniband/sw/rxe/rxe_mcast.c

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