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PCI: Prevent sysfs disable of device while driver is attached

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[ Upstream commit 6f5cdfa802 ]

Manipulating the enable_cnt behind the back of the driver will wreak
complete havoc with the kernel state, so disallow it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig
2018-05-18 18:56:24 +02:00
committed by Greg Kroah-Hartman
parent 40e082b99a
commit 549f4ee688
1 changed files with 9 additions and 6 deletions
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15
drivers/pci/pci-sysfs.c
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@@ -180,13 +180,16 @@ static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!val) {
if (pci_is_enabled(pdev))
pci_disable_device(pdev);
else
result = -EIO;
} else
device_lock(dev);
if (dev->driver)
result = -EBUSY;
else if (val)
result = pci_enable_device(pdev);
else if (pci_is_enabled(pdev))
pci_disable_device(pdev);
else
result = -EIO;
device_unlock(dev);
return result < 0 ? result : count;
}