linux-kernel - [PATCH v6 06/53] PCI: Claim fixed resource during remove/rescan path

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: <1443678807-786-7-git-send-email-yinghai@kernel.org>
Date:	Wed, 30 Sep 2015 22:52:40 -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 v6 06/53] PCI: Claim fixed resource during remove/rescan path

During driver loading kernel will check if resources get reserved.
so we need to make sure resources get reserved before pci_bus_add().

On remove/rescan path, we will leave those fixed resource
not reserved. In that path, We don't call pcibios_resource_survery()
before pci_assign_unassigned_bus_resources(), and that is intentional
for us to get new resources for rescan. We do need to use rescan to make
device get resource allocated while ignoring BIOS allocate resource.

But fixed resources are not allocated via
pci_assign_unassigned_bus_resources(), so we need to reserve them
explicitly.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/quirks.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 6a30252..c1d9a78 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -323,6 +323,23 @@ static void quirk_s3_64M(struct pci_dev *dev)
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_S3,	PCI_DEVICE_ID_S3_868,		quirk_s3_64M);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_S3,	PCI_DEVICE_ID_S3_968,		quirk_s3_64M);
 
+/* for pci remove and rescan */
+static void quirk_allocate_fixed(struct pci_dev *dev)
+{
+	int i;
+	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+		struct resource *r = &dev->resource[i];
+
+		if (r->parent ||
+		    !(r->flags & IORESOURCE_PCI_FIXED) ||
+		    !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
+			continue;
+
+		pci_claim_resource(dev, i);
+	}
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID,	PCI_ANY_ID,	quirk_allocate_fixed);
+
 static void quirk_io(struct pci_dev *dev, int pos, unsigned size,
 		     const char *name)
 {
-- 
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/