linux-kernel - [PATCH] rds_rdma: don't assume infiniband device is PCI

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Date:	Wed,  4 Jan 2012 20:03:16 -0200
From:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
To:	venkat.x.venkatsubra@...cle.com
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>,
	dledford@...hat.com, Jes.Sorensen@...hat.com,
	rds-devel@....oracle.com
Subject: [PATCH] rds_rdma: don't assume infiniband device is PCI

RDS code assumes that the struct ib_device dma_device member, which is a
pointer, points to a struct device embedded in a struct pci_dev.

This is not the case for ehca, for example, which is a OF driver, and
makes dma_device point to a struct device embedded in a struct
platform_device.

This will make the system crash when rds_rdma is loaded in a system
with ehca, since it will try to access the bus member of a non-existent
struct pci_dev.

The only reason rds_rdma uses the struct pci_dev is to get the NUMA node
the device is attached to. Using dev_to_node for that is much better,
since it won't assume which bus the infiniband is attached to.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Cc: dledford@...hat.com
Cc: Jes.Sorensen@...hat.com
Cc: Venkat Venkatsubra <venkat.x.venkatsubra@...cle.com>
Cc: rds-devel@....oracle.com
---
 net/rds/ib.h |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/net/rds/ib.h b/net/rds/ib.h
index edfaaaf..8d2b3d5 100644
--- a/net/rds/ib.h
+++ b/net/rds/ib.h
@@ -186,8 +186,7 @@ struct rds_ib_device {
 	struct work_struct	free_work;
 };

-#define pcidev_to_node(pcidev) pcibus_to_node(pcidev->bus)
-#define ibdev_to_node(ibdev) pcidev_to_node(to_pci_dev(ibdev->dma_device))
+#define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)

 /* bits for i_ack_flags */
-- 
1.7.4.4

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