linux-kernel - [PATCH v5 17/53] PCI: Separate out save_resources()/restore

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1442440671-5361-18-git-send-email-yinghai@kernel.org>
Date:	Wed, 16 Sep 2015 14:57:15 -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:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH v5 17/53] PCI: Separate out save_resources()/restore_resources()

We need to save/restore resources several times for alt_size support,
separate the save_resources()/resources() to save some lines later.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/setup-bus.c | 49 ++++++++++++++++++++++++++++++-------------------
 1 file changed, 30 insertions(+), 19 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 71e20f8..c067ae0 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -436,6 +436,29 @@ static bool pci_need_to_release(unsigned long mask, struct resource *res)
 	return false;	/* should not get here */
 }
 
+static bool save_resources(struct list_head *head,
+			   struct list_head *save_head)
+{
+	struct pci_dev_resource *dev_res;
+
+	/* Save original start, end, flags etc at first */
+	list_for_each_entry(dev_res, head, list)
+		if (add_to_list(save_head, dev_res->dev, dev_res->res)) {
+			free_list(save_head);
+			return false;
+		}
+
+	return true;
+}
+
+static void restore_resource(struct pci_dev_resource *save_res,
+			     struct resource *res)
+{
+	res->start = save_res->start;
+	res->end = save_res->end;
+	res->flags = save_res->flags;
+}
+
 static void __assign_resources_sorted(struct list_head *head,
 				 struct list_head *realloc_head,
 				 struct list_head *fail_head)
@@ -473,13 +496,8 @@ static void __assign_resources_sorted(struct list_head *head,
 	if (!realloc_head || list_empty(realloc_head))
 		goto requested_and_reassign;
 
-	/* Save original start, end, flags etc at first */
-	list_for_each_entry(dev_res, head, list) {
-		if (add_to_list(&save_head, dev_res->dev, dev_res->res)) {
-			free_list(&save_head);
-			goto requested_and_reassign;
-		}
-	}
+	if (!save_resources(head, &save_head))
+		goto requested_and_reassign;
 
 	/* Update res in head list with add_size in realloc_head list */
 	list_for_each_entry(dev_res, head, list) {
@@ -548,12 +566,9 @@ static void __assign_resources_sorted(struct list_head *head,
 		}
 	}
 	/* Restore start/end/flags from saved list */
-	list_for_each_entry(save_res, &save_head, list) {
-		res = save_res->res;
-		res->start = save_res->start;
-		res->end = save_res->end;
-		res->flags = save_res->flags;
-	}
+	list_for_each_entry(save_res, &save_head, list)
+		restore_resource(save_res, save_res->res);
+
 	free_list(&save_head);
 
 requested_and_reassign:
@@ -1917,9 +1932,7 @@ again:
 	list_for_each_entry(fail_res, &fail_head, list) {
 		struct resource *res = fail_res->res;
 
-		res->start = fail_res->start;
-		res->end = fail_res->end;
-		res->flags = fail_res->flags;
+		restore_resource(fail_res, res);
 		if (fail_res->dev->subordinate)
 			res->flags = 0;
 	}
@@ -1983,9 +1996,7 @@ again:
 	list_for_each_entry(fail_res, &fail_head, list) {
 		struct resource *res = fail_res->res;
 
-		res->start = fail_res->start;
-		res->end = fail_res->end;
-		res->flags = fail_res->flags;
+		restore_resource(fail_res, res);
 		if (fail_res->dev->subordinate)
 			res->flags = 0;
 	}
-- 
1.8.4.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/