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IB/mlx5: Fix outstanding_pi index for GSI qps 

Commit b0ffeb537f ("IB/mlx5: Fix iteration overrun in GSI qps") changed
the way outstanding WRs are tracked for the GSI QP. But the fix did not
cover the case when a call to ib_post_send() fails and updates index to
track outstanding.

Since the prior commmit outstanding_pi should not be bounded otherwise the
loop generate_completions() will fail.

Fixes: b0ffeb537f ("IB/mlx5: Fix iteration overrun in GSI qps")
Link: https://lore.kernel.org/r/1576195889-23527-1-git-send-email-psajeepa@purestorage.com
Signed-off-by: Prabhath Sajeepa <psajeepa@purestorage.com>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Prabhath Sajeepa 2019-12-12 17:11:29 -07:00 committed by Jason Gunthorpe
parent 58fb0b5625
commit b5671afe5e
1 changed files with 1 additions and 2 deletions
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3
drivers/infiniband/hw/mlx5/gsi.c
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@ -507,8 +507,7 @@ int mlx5_ib_gsi_post_send(struct ib_qp *qp, const struct ib_send_wr *wr,
ret = ib_post_send(tx_qp, &cur_wr.wr, bad_wr);
if (ret) {
/* Undo the effect of adding the outstanding wr */
gsi->outstanding_pi = (gsi->outstanding_pi - 1) %
gsi->cap.max_send_wr;
gsi->outstanding_pi--;
goto err;
}
spin_unlock_irqrestore(&gsi->lock, flags);