From: Allen Hubbe <Allen.Hubbe@emc.com>
Date: Tue, 12 May 2015 10:24:27 +0000 (-0400)
Subject: NTB: Do not advance transport RX on link down
X-Git-Tag: v5.15~15466^2~14
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c0900b33d1c8c24246eaedb9553f078024c332fc;p=platform%2Fkernel%2Flinux-starfive.git

NTB: Do not advance transport RX on link down

On link down, don't advance RX index to the next entry.  The next entry
should never be valid after receiving the link down flag.

Signed-off-by: Allen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
---

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 8d9b59f7fa07..0f86b60a0c0e 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -1212,8 +1212,7 @@ static int ntb_process_rxc(struct ntb_transport_qp *qp)
 		dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n");
 		ntb_qp_link_down(qp);
 		hdr->flags = 0;
-		iowrite32(qp->rx_index, &qp->rx_info->entry);
-		return 0;
+		return -EAGAIN;
 	}
 
 	if (hdr->ver != (u32)qp->rx_pkts) {