linux-kernel - [PATCH 4.16 070/113] PCI: aardvark: Set PIO_ADDR_LS correctly in advk_pcie_rd

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Date:   Mon, 30 Apr 2018 12:24:41 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Victor Gu <xigu@...vell.com>,
        Wilson Ding <dingwei@...vell.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: [PATCH 4.16 070/113] PCI: aardvark: Set PIO_ADDR_LS correctly in advk_pcie_rd_conf()

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

------------------

From: Victor Gu <xigu@...vell.com>

commit 4fa3999ee672c54a5498ce98e20fe3fdf9c1cbb4 upstream.

When setting the PIO_ADDR_LS register during a configuration read, we
were properly passing the device number, function number and register
number, but not the bus number, causing issues when reading the
configuration of PCIe devices.

Fixes: 8c39d710363c1 ("PCI: aardvark: Add Aardvark PCI host controller driver")
Cc: <stable@...r.kernel.org>
Signed-off-by: Victor Gu <xigu@...vell.com>
Reviewed-by: Wilson Ding <dingwei@...vell.com>
Reviewed-by: Nadav Haklai <nadavh@...vell.com>
[Thomas: tweak commit log.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/host/pci-aardvark.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/pci/host/pci-aardvark.c
+++ b/drivers/pci/host/pci-aardvark.c
@@ -172,8 +172,6 @@
 #define PCIE_CONFIG_WR_TYPE0			0xa
 #define PCIE_CONFIG_WR_TYPE1			0xb
 
-/* PCI_BDF shifts 8bit, so we need extra 4bit shift */
-#define PCIE_BDF(dev)				(dev << 4)
 #define PCIE_CONF_BUS(bus)			(((bus) & 0xff) << 20)
 #define PCIE_CONF_DEV(dev)			(((dev) & 0x1f) << 15)
 #define PCIE_CONF_FUNC(fun)			(((fun) & 0x7)	<< 12)
@@ -456,7 +454,7 @@ static int advk_pcie_rd_conf(struct pci_
 	advk_writel(pcie, reg, PIO_CTRL);
 
 	/* Program the address registers */
-	reg = PCIE_BDF(devfn) | PCIE_CONF_REG(where);
+	reg = PCIE_CONF_ADDR(bus->number, devfn, where);
 	advk_writel(pcie, reg, PIO_ADDR_LS);
 	advk_writel(pcie, 0, PIO_ADDR_MS);