linux-kernel - [PATCH 4.2.y-ckt 167/206] alpha/PCI: Call iomem_is_exclusive() for IORESOURCE_MEM, but not IORESOURCE

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Message-Id: <1465507015-23052-168-git-send-email-kamal@canonical.com>
Date:	Thu,  9 Jun 2016 14:16:16 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 167/206] alpha/PCI: Call iomem_is_exclusive() for IORESOURCE_MEM, but not IORESOURCE_IO

4.2.8-ckt12 -stable review patch.  If anyone has any objections, please let me know.

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

From: Bjorn Helgaas <bhelgaas@...gle.com>

commit c20e128030caf0537d5e906753eac1c28fefdb75 upstream.

The alpha pci_mmap_resource() is used for both IORESOURCE_MEM and
IORESOURCE_IO resources, but iomem_is_exclusive() is only applicable for
IORESOURCE_MEM.

Call iomem_is_exclusive() only for IORESOURCE_MEM resources, and do it
earlier to match the generic version of pci_mmap_resource().

Fixes: 10a0ef39fbd1 ("PCI/alpha: pci sysfs resources")
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
CC: Ivan Kokshaysky <ink@...assic.park.msu.ru>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/alpha/kernel/pci-sysfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c
index 99e8d47..92c0d46 100644
--- a/arch/alpha/kernel/pci-sysfs.c
+++ b/arch/alpha/kernel/pci-sysfs.c
@@ -77,10 +77,10 @@ static int pci_mmap_resource(struct kobject *kobj,
 	if (i >= PCI_ROM_RESOURCE)
 		return -ENODEV;
 
-	if (!__pci_mmap_fits(pdev, i, vma, sparse))
+	if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
 		return -EINVAL;
 
-	if (iomem_is_exclusive(res->start))
+	if (!__pci_mmap_fits(pdev, i, vma, sparse))
 		return -EINVAL;
 
 	pcibios_resource_to_bus(pdev->bus, &bar, res);
-- 
2.7.4