From: Niklas Cassel <niklas.cassel@axis.com>
Date: Wed, 20 Dec 2017 00:29:30 +0100
Subject: PCI: dwc: dra7xx: Help compiler to remove unused code
Git-commit: f1aba0a0de55c72cded9a8951ef30680e7f46389
Patch-mainline: v4.16-rc1
References: fate#326536, fate#326532
The dra7xx driver supports both host and ep mode.
When enabling support for only one of the modes, help the compiler
to remove code for the mode that we have not enabled in the driver.
By adding if (!IS_ENABLED(CONFIG_PCI_DRA7XX_HOST)) return -ENODEV;
anything after that statement will get silently dropped by the compiler,
including static functions and structures that are referenced indirectly
from there.
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/pci/dwc/pci-dra7xx.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index 02268dd33f12..6a5ccd447615 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -694,6 +694,11 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
switch (mode) {
case DW_PCIE_RC_TYPE:
+ if (!IS_ENABLED(CONFIG_PCI_DRA7XX_HOST)) {
+ ret = -ENODEV;
+ goto err_gpio;
+ }
+
dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
DEVICE_TYPE_RC);
ret = dra7xx_add_pcie_port(dra7xx, pdev);
@@ -701,6 +706,11 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
goto err_gpio;
break;
case DW_PCIE_EP_TYPE:
+ if (!IS_ENABLED(CONFIG_PCI_DRA7XX_EP)) {
+ ret = -ENODEV;
+ goto err_gpio;
+ }
+
dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
DEVICE_TYPE_EP);
--
2.11.0