linux-kernel - [PATCH] PCI: Tone down resource mmap warning

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Message-ID: <20171129225708.32271.35467.stgit@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 29 Nov 2017 16:57:08 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     Dave Jones <davej@...emonkey.org.uk>,
        Fengguang Wu <fengguang.wu@...el.com>,
        linux-kernel@...r.kernel.org, David Woodhouse <dwmw@...zon.co.uk>
Subject: [PATCH] PCI: Tone down resource mmap warning

From: Bjorn Helgaas <bhelgaas@...gle.com>

When a process tries to mmap more space than is available in a PCI BAR, we
emit a warning and a backtrace.  The mmap fails anyway, so the backtrace is
mainly for debugging.  It seems like overkill now, so reduce this to a
dev_info() and remove the backtrace.

This was added by b5ff7df3df9e ("Check mapped ranges on sysfs resource
files").

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/pci/pci-sysfs.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 06c7f0b85cd2..97f071674605 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1217,11 +1217,9 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 		return -EINVAL;
 
 	if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS)) {
-		WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
+		dev_info(&pdev->dev, "process \"%s\" tried to map 0x%lx bytes at page 0x%lx of BAR %d %pR\n",
 			current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
-			pci_name(pdev), bar,
-			(u64)pci_resource_start(pdev, bar),
-			(u64)pci_resource_len(pdev, bar));
+			bar, res);
 		return -EINVAL;
 	}
 	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;