linux-kernel - [PATCH 4.2.y-ckt 88/98] be2net: Don't leak iomapped memory on removal.

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Date:	Tue, 15 Mar 2016 16:31:22 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Douglas Miller <dougmill@...ux.vnet.ibm.com>,
	"David S . Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 88/98] be2net: Don't leak iomapped memory on removal.

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Douglas Miller <dougmill@...ux.vnet.ibm.com>

commit a69bf3c5b49ef488970c74e26ba0ec12f08491c2 upstream.

The adapter->pcicfg resource is either mapped via pci_iomap() or
derived from adapter->db. During be_remove() this resource was ignored
and so could remain mapped after remove.

Add a flag to track whether adapter->pcicfg was mapped or not, then
use that flag in be_unmap_pci_bars() to unmap if required.

Fixes: 25848c901 ("use PCI MMIO read instead of config read for errors")

Signed-off-by: Douglas Miller <dougmill@...ux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/ethernet/emulex/benet/be.h      | 1 +
 drivers/net/ethernet/emulex/benet/be_main.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index 8d12b41..3c53d7f 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -527,6 +527,7 @@ struct be_adapter {
 
 	struct delayed_work be_err_detection_work;
 	u8 err_flags;
+	bool pcicfg_mapped;	/* pcicfg obtained via pci_iomap() */
 	u32 flags;
 	u32 cmd_privileges;
 	/* Ethtool knobs and info */
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 6ca693b..8dbec20 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -5481,6 +5481,8 @@ static void be_unmap_pci_bars(struct be_adapter *adapter)
 		pci_iounmap(adapter->pdev, adapter->csr);
 	if (adapter->db)
 		pci_iounmap(adapter->pdev, adapter->db);
+	if (adapter->pcicfg && adapter->pcicfg_mapped)
+		pci_iounmap(adapter->pdev, adapter->pcicfg);
 }
 
 static int db_bar(struct be_adapter *adapter)
@@ -5532,8 +5534,10 @@ static int be_map_pci_bars(struct be_adapter *adapter)
 			if (!addr)
 				goto pci_map_err;
 			adapter->pcicfg = addr;
+			adapter->pcicfg_mapped = true;
 		} else {
 			adapter->pcicfg = adapter->db + SRIOV_VF_PCICFG_OFFSET;
+			adapter->pcicfg_mapped = false;
 		}
 	}
 
-- 
2.7.0