linux-kernel - [PATCH 5.4 62/76] RDMA/restrack: Dont treat as an error allocation ID wrapping

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Date:   Mon, 18 Jan 2021 12:35:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>
Subject: [PATCH 5.4 62/76] RDMA/restrack: Dont treat as an error allocation ID wrapping

From: Leon Romanovsky <leonro@...dia.com>

commit 3c638cdb8ecc0442552156e0fed8708dd2c7f35b upstream.

xa_alloc_cyclic() call returns positive number if ID allocation
succeeded but wrapped. It is not an error, so normalize the "ret"
variable to zero as marker of not-an-error.

   drivers/infiniband/core/restrack.c:261 rdma_restrack_add()
   warn: 'ret' can be either negative or positive

Fixes: fd47c2f99f04 ("RDMA/restrack: Convert internal DB from hash to XArray")
Link: https://lore.kernel.org/r/20201216100753.1127638-1-leon@kernel.org
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/core/restrack.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/infiniband/core/restrack.c
+++ b/drivers/infiniband/core/restrack.c
@@ -234,6 +234,7 @@ static void rdma_restrack_add(struct rdm
 	} else {
 		ret = xa_alloc_cyclic(&rt->xa, &res->id, res, xa_limit_32b,
 				      &rt->next_id, GFP_KERNEL);
+		ret = (ret < 0) ? ret : 0;
 	}
 
 	if (!ret)