linux-kernel - [RFC PATCH V5 1/5] PCI: Embed pci_ecam_ops in pci_config

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Message-Id: <1470661541-26270-2-git-send-email-tn@semihalf.com>
Date:	Mon,  8 Aug 2016 15:05:37 +0200
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	helgaas@...nel.org, arnd@...db.de, will.deacon@....com,
	catalin.marinas@....com, rafael@...nel.org,
	Lorenzo.Pieralisi@....com
Cc:	hanjun.guo@...aro.org, okaya@...eaurora.org, jchandra@...adcom.com,
	cov@...eaurora.org, dhdang@....com, ard.biesheuvel@...aro.org,
	robert.richter@...iumnetworks.com, mw@...ihalf.com,
	Liviu.Dudau@....com, ddaney@...iumnetworks.com,
	wangyijing@...wei.com, msalter@...hat.com,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-acpi@...ts.linaro.org, jcm@...hat.com,
	andrea.gallo@...aro.org, jeremy.linton@....com,
	liudongdong3@...wei.com, gabriele.paoloni@...wei.com,
	jhugo@...eaurora.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Tomasz Nowicki <tn@...ihalf.com>
Subject: [RFC PATCH V5 1/5] PCI: Embed pci_ecam_ops in pci_config_window structure

pci_config_window keeps pointer to pci_ecam_ops and every time
we want to deallocate pci_config_window (pci_ecam_free()) we need to make
sure to free pci_ecam_ops in case it was dynamically allocated prior to
pci_ecam_create() call.

To avoid that extra effort, embed pci_ecam_ops in pci_config_window,
instead of just a pointer.

Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
To: Jayachandran C <jchandra@...adcom.com>
---
 arch/arm64/kernel/pci.c  | 2 +-
 drivers/pci/ecam.c       | 6 +++---
 include/linux/pci-ecam.h | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index acf3872..981e828 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -183,7 +183,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 		return NULL;
 	}
 
-	acpi_pci_root_ops.pci_ops = &ri->cfg->ops->pci_ops;
+	acpi_pci_root_ops.pci_ops = &ri->cfg->ops.pci_ops;
 	bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &ri->common,
 				   ri->cfg);
 	if (!bus)
diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
index 43ed08d..24242f0 100644
--- a/drivers/pci/ecam.c
+++ b/drivers/pci/ecam.c
@@ -52,7 +52,7 @@ struct pci_config_window *pci_ecam_create(struct device *dev,
 		return ERR_PTR(-ENOMEM);
 
 	cfg->parent = dev;
-	cfg->ops = ops;
+	cfg->ops = *ops;
 	cfg->busr.start = busr->start;
 	cfg->busr.end = busr->end;
 	cfg->busr.flags = IORESOURCE_BUS;
@@ -138,7 +138,7 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
 			       int where)
 {
 	struct pci_config_window *cfg = bus->sysdata;
-	unsigned int devfn_shift = cfg->ops->bus_shift - 8;
+	unsigned int devfn_shift = cfg->ops.bus_shift - 8;
 	unsigned int busn = bus->number;
 	void __iomem *base;
 
@@ -149,7 +149,7 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
 	if (per_bus_mapping)
 		base = cfg->winp[busn];
 	else
-		base = cfg->win + (busn << cfg->ops->bus_shift);
+		base = cfg->win + (busn << cfg->ops.bus_shift);
 	return base + (devfn << devfn_shift) + where;
 }
 
diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index 7adad20..0ce2920 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -39,7 +39,7 @@ struct pci_config_window {
 	struct resource			res;
 	struct resource			busr;
 	void				*priv;
-	struct pci_ecam_ops		*ops;
+	struct pci_ecam_ops		ops;
 	union {
 		void __iomem		*win;	/* 64-bit single mapping */
 		void __iomem		**winp; /* 32-bit per-bus mapping */
-- 
1.9.1