This is a note to let you know that I've just added the patch titled
RDMA/cxgb4: Initialize the device status page
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rdma-cxgb4-initialize-the-device-status-page.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6b54d54dea82ae214e4a45a503c4ef755a8ecee8 Mon Sep 17 00:00:00 2001
From: Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 8 Jul 2014 10:20:35 -0500
Subject: RDMA/cxgb4: Initialize the device status page
From: Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Roland Dreier <roland@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/cxgb4/device.c | 1 +
1 file changed, 1 insertion(+)
--- 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_rd
pr_err(MOD "error allocating status page\n");
goto err4;
}
+ rdev->status_page->db_off = 0;
return 0;
err4:
c4iw_rqtpool_destroy(rdev);
Patches currently in stable-queue which might be from swise@xxxxxxxxxxxxxxxxxxxxx are
queue-3.15/rdma-cxgb4-initialize-the-device-status-page.patch
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