diff options
| author | Christoph Hellwig <hch@lst.de> | 2018-05-18 19:56:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-03 08:50:29 +0300 |
| commit | 2040b0d8c9c0aa2e50b733c0ecd12d8605d8a66d (patch) | |
| tree | 95aef339ddc7bf2bbfa75030feb56437af8dcd85 /drivers/pci | |
| parent | d93663a78783621895afd0999272c2ab8bad82cd (diff) | |
| download | linux-2040b0d8c9c0aa2e50b733c0ecd12d8605d8a66d.tar.xz | |
PCI: Prevent sysfs disable of device while driver is attached
[ Upstream commit 6f5cdfa802733dcb561bf664cc89d203f2fd958f ]
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 00fa4278c1f4..c3f0473d1afa 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -305,13 +305,16 @@ 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; } |