linux-kernel - [PATCH v4 16/52] PCI: Check if resource is allocated before trying to assign one

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Message-Id: <1440138067-4314-17-git-send-email-yinghai@kernel.org>
Date:	Thu, 20 Aug 2015 23:20:31 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>, TJ <linux@....tj>,
	Yijing Wang <wangyijing@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH v4 16/52] PCI: Check if resource is allocated before trying to assign one

In following alt_size support, we will call pci_assign_resource()
on one resource list several times, and some resources could have been
assigned already.

Skip allocated resource in the list, as pci_assign_resource()
only can handle not assigned resource.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/setup-bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index b17ee2d..ccc6f9d 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -380,7 +380,7 @@ static void assign_requested_resources_sorted(struct list_head *head,
 	list_for_each_entry(dev_res, head, list) {
 		res = dev_res->res;
 		idx = res - &dev_res->dev->resource[0];
-		if (resource_size(res) &&
+		if (!res->parent && resource_size(res) &&
 		    pci_assign_resource(dev_res->dev, idx)) {
 			if (fail_head)
 				add_to_list(fail_head, dev_res->dev, res);
-- 
1.8.4.5

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