linux-kernel - [PATCH v1 15/25] PCI: generic: Free resource list close to where it's allocated

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Date:	Mon, 06 Jun 2016 18:06:36 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	linux-pci@...r.kernel.org
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Rob Herring <robh@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Scott Branden <sbranden@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Pratyush Anand <pratyush.anand@...il.com>,
	linux-kernel@...r.kernel.org, rfi@...ts.rocketboards.org,
	linux-renesas-soc@...r.kernel.org,
	Simon Horman <horms@...ge.net.au>,
	Thierry Reding <thierry.reding@...il.com>,
	Tanmay Inamdar <tinamdar@....com>, Ray Jui <rjui@...adcom.com>,
	linux-tegra@...r.kernel.org, Ley Foon Tan <lftan@...era.com>,
	Michal Simek <michal.simek@...inx.com>,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v1 15/25] PCI: generic: Free resource list close to where
 it's allocated

Previously we allocated the PCI resource list in
gen_pci_parse_request_of_pci_ranges(), but if we had an error, we freed it
on error in gen_pci_init().

Reorder gen_pci_init() so we can take care of error path cleanup in
gen_pci_parse_request_of_pci_ranges() instead.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/pci/host/pci-host-common.c |   32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/drivers/pci/host/pci-host-common.c b/drivers/pci/host/pci-host-common.c
index 8cba7ab..16a4e61 100644
--- a/drivers/pci/host/pci-host-common.c
+++ b/drivers/pci/host/pci-host-common.c
@@ -73,6 +73,7 @@ static int gen_pci_parse_request_of_pci_ranges(struct device *dev,
 	return 0;
 
 out_release_res:
+	pci_free_resource_list(resources);
 	return err;
 }
 
@@ -89,33 +90,30 @@ static struct pci_config_window *gen_pci_init(struct device *dev,
 	struct resource *bus_range = NULL;
 	struct pci_config_window *cfg;
 
-	/* Parse our PCI ranges and request their resources */
-	err = gen_pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
-	if (err)
-		goto err_out;
-
 	err = of_address_to_resource(dev->of_node, 0, &cfgres);
 	if (err) {
 		dev_err(dev, "missing \"reg\" property\n");
-		goto err_out;
+		return err;
 	}
 
 	cfg = pci_ecam_create(dev, &cfgres, bus_range, ops);
-	if (IS_ERR(cfg)) {
-		err = PTR_ERR(cfg);
-		goto err_out;
-	}
+	if (IS_ERR(cfg))
+		return PTR_ERR(cfg);
 
 	err = devm_add_action(dev, gen_pci_unmap_cfg, cfg);
-	if (err) {
-		gen_pci_unmap_cfg(cfg);
-		goto err_out;
-	}
+	if (err)
+		goto err_cfg;
+
+	/* Parse our PCI ranges and request their resources */
+	err = gen_pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
+	if (err)
+		goto err_cfg;
+
 	return cfg;
 
-err_out:
-	pci_free_resource_list(resources);
-	return ERR_PTR(err);
+err_cfg:
+	gen_pci_unmap_cfg(cfg);
+	return err;
 }
 
 int pci_host_common_probe(struct platform_device *pdev,