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PCI: Remove sysfs resource mmap warning 

When a process uses sysfs and 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.  But in general we don't emit kernel
messages when syscalls return failure.

The similar procfs mmap path simply fails the mmap with no warning.  Remove
the sysfs warning.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2017-11-29 11:47:29 -06:00
parent 1291a0d504
commit 7a09490966
1 changed files with 2 additions and 7 deletions
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9
drivers/pci/pci-sysfs.c
View File

@ -1216,14 +1216,9 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
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",
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));
if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
return -EINVAL;
}
mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);