Patch "IB/core: Fix two kernel warnings triggered by rxe registration" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

    IB/core: Fix two kernel warnings triggered by rxe registration

to the 4.15-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:
     ib-core-fix-two-kernel-warnings-triggered-by-rxe-registration.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.

From 02ee9da347873699603d9ce0112a80b5dd69dea1 Mon Sep 17 00:00:00 2001

From: Bart Van Assche <redacted>
Date: Wed, 3 Jan 2018 13:28:18 -0800
Subject: IB/core: Fix two kernel warnings triggered by rxe registration

From: Bart Van Assche <redacted>

commit 02ee9da347873699603d9ce0112a80b5dd69dea1 upstream.

Eliminate the WARN_ONs that create following two warnings when
registering an rxe device:

WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/device.c:449 ib_register_device+0x591/0x640 [ib_core]
CPU: 2 PID: 1005 Comm: run_tests Not tainted 4.15.0-rc4-dbg+ #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
RIP: 0010:ib_register_device+0x591/0x640 [ib_core]
Call Trace:
 rxe_register_device+0x3c6/0x470 [rdma_rxe]
 rxe_add+0x543/0x5e0 [rdma_rxe]
 rxe_net_add+0x37/0xb0 [rdma_rxe]
 rxe_param_set_add+0x5a/0x120 [rdma_rxe]
 param_attr_store+0x5e/0xc0
 module_attr_store+0x19/0x30
 sysfs_kf_write+0x3d/0x50
 kernfs_fop_write+0x116/0x1a0
 __vfs_write+0x23/0x120
 vfs_write+0xbe/0x1b0
 SyS_write+0x44/0xa0
 entry_SYSCALL_64_fastpath+0x23/0x9a

WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/sysfs.c:1279 ib_device_register_sysfs+0x11d/0x160 [ib_core]
CPU: 2 PID: 1005 Comm: run_tests Tainted: G        W        4.15.0-rc4-dbg+ #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
RIP: 0010:ib_device_register_sysfs+0x11d/0x160 [ib_core]
Call Trace:
 ib_register_device+0x3f7/0x640 [ib_core]
 rxe_register_device+0x3c6/0x470 [rdma_rxe]
 rxe_add+0x543/0x5e0 [rdma_rxe]
 rxe_net_add+0x37/0xb0 [rdma_rxe]
 rxe_param_set_add+0x5a/0x120 [rdma_rxe]
 param_attr_store+0x5e/0xc0
 module_attr_store+0x19/0x30
 sysfs_kf_write+0x3d/0x50
 kernfs_fop_write+0x116/0x1a0
 __vfs_write+0x23/0x120
 vfs_write+0xbe/0x1b0
 SyS_write+0x44/0xa0
 entry_SYSCALL_64_fastpath+0x23/0x9a

The code should accept either a parent pointer or a fully specified DMA
specification without producing warnings.

Fixes: 99db9494035f ("IB/core: Remove ib_device.dma_device")
Signed-off-by: Bart Van Assche <redacted>
Cc: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Jason Gunthorpe <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/core/device.c |   20 ++++++++++++++------
 drivers/infiniband/core/sysfs.c  |    1 -
 2 files changed, 14 insertions(+), 7 deletions(-)

--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c

@@ -462,7 +462,6 @@ int ib_register_device(struct ib_device
 	struct ib_udata uhw = {.outlen = 0, .inlen = 0};
 	struct device *parent = device->dev.parent;
 
-	WARN_ON_ONCE(!parent);
 	WARN_ON_ONCE(device->dma_device);
 	if (device->dev.dma_ops) {
 		/*

@@ -471,16 +470,25 @@ int ib_register_device(struct ib_device
 		 * into device->dev.
 		 */
 		device->dma_device = &device->dev;
-		if (!device->dev.dma_mask)
-			device->dev.dma_mask = parent->dma_mask;
-		if (!device->dev.coherent_dma_mask)
-			device->dev.coherent_dma_mask =
-				parent->coherent_dma_mask;
+		if (!device->dev.dma_mask) {
+			if (parent)
+				device->dev.dma_mask = parent->dma_mask;
+			else
+				WARN_ON_ONCE(true);
+		}
+		if (!device->dev.coherent_dma_mask) {
+			if (parent)
+				device->dev.coherent_dma_mask =
+					parent->coherent_dma_mask;
+			else
+				WARN_ON_ONCE(true);
+		}
 	} else {
 		/*
 		 * The caller did not provide custom DMA operations. Use the
 		 * DMA mapping operations of the parent device.
 		 */
+		WARN_ON_ONCE(!parent);
 		device->dma_device = parent;
 	}
 
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c

@@ -1276,7 +1276,6 @@ int ib_device_register_sysfs(struct ib_d
 	int ret;
 	int i;
 
-	WARN_ON_ONCE(!device->dev.parent);
 	ret = dev_set_name(class_dev, "%s", device->name);
 	if (ret)
 		return ret;

Patches currently in stable-queue which might be from bart.vanassche@wdc.com are

queue-4.15/ib-core-fix-two-kernel-warnings-triggered-by-rxe-registration.patch
queue-4.15/rdma-rxe-fix-a-race-condition-in-rxe_requester.patch
queue-4.15/rdma-rxe-fix-rxe_qp_cleanup.patch
queue-4.15/rdma-rxe-fix-a-race-condition-related-to-the-qp-error-state.patch