From: Steve Wise <swise@opengridcomputing.com>
Date: Tue, 8 Jul 2014 15:20:35 +0000 (-0500)
Subject: RDMA/cxgb4: Initialize the device status page
X-Git-Tag: v3.15.7~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c775c1c4a8501bf772f36475a8bfc5e52eba549;p=thirdparty%2Fkernel%2Fstable.git

RDMA/cxgb4: Initialize the device status page

commit 6b54d54dea82ae214e4a45a503c4ef755a8ecee8 upstream.

The status page is mapped to user processes and allows sharing the
device state between the kernel and user processes.  This state isn't
getting initialized and thus intermittently causes problems.  Namely,
the user process can mistakenly think the user doorbell writes are
disabled which causes SQ work requests to never get fetched by HW.

Fixes: 05eb23893c2c ("cxgb4/iw_cxgb4: Doorbell Drop Avoidance Bug Fixes").
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
index 8914ea90ddd9e..bff1a8ed47d01 100644
--- a/drivers/infiniband/hw/cxgb4/device.c
+++ b/drivers/infiniband/hw/cxgb4/device.c
@@ -654,6 +654,7 @@ static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 		pr_err(MOD "error allocating status page\n");
 		goto err4;
 	}
+	rdev->status_page->db_off = 0;
 	return 0;
 err4:
 	c4iw_rqtpool_destroy(rdev);