[PATCH v2 1/4] PCI: Ignore resource_alignment if PCI_PROBE_ONLY was set

From	Yongji Xie <xyjxie@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	[PATCH v2 1/4] PCI: Ignore resource_alignment if PCI_PROBE_ONLY was set
Date	2016-05-30 15:10 +0200
Message-ID	<rEv7b-4Dp-1@gated-at.bofh.it> (permalink)
References	<rEv7b-4Dp-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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The resource_alignment will releases memory resources allocated
by firmware so that kernel can reassign new resources later on.
But this will cause the problem that no resources can be
allocated by kernel if PCI_PROBE_ONLY was set, e.g. on pSeries
platform because PCI_PROBE_ONLY force kernel to use firmware
setup and not to reassign any resources.

To solve this problem, this patch ignores resource_alignment
if PCI_PROBE_ONLY was set.

Signed-off-by: Yongji Xie <xyjxie@linux.vnet.ibm.com>
---
 drivers/pci/pci.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index c8b4dbd..a259394 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4761,6 +4761,12 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
 	spin_lock(&resource_alignment_lock);
 	p = resource_alignment_param;
 	while (*p) {
+		if (pci_has_flag(PCI_PROBE_ONLY)) {
+			printk(KERN_ERR "PCI: Ignore resource_alignment parameter: %s with PCI_PROBE_ONLY set\n",
+					p);
+			*p = 0;
+			break;
+		}
 		count = 0;
 		if (sscanf(p, "%d%n", &align_order, &count) == 1 &&
 							p[count] == '@') {
-- 
1.7.9.5

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[PATCH v2 1/4] PCI: Ignore resource_alignment if PCI_PROBE_ONLY was set Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-05-30 15:10 +0200

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