diff options
| author | Christoph Hellwig <hch@lst.de> | 2018-05-18 18:56:24 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-05-26 00:28:02 +0200 |
| commit | 6f5cdfa802733dcb561bf664cc89d203f2fd958f (patch) | |
| tree | bd0ece32aabf1720cfccbf8197166dd8950c5bf1 /drivers/pci/pci-sysfs.c | |
| parent | PCI: Check whether bridges allow access to extended config space (diff) | |
| download | linux-6f5cdfa802733dcb561bf664cc89d203f2fd958f.tar.xz linux-6f5cdfa802733dcb561bf664cc89d203f2fd958f.zip | |
PCI: Prevent sysfs disable of device while driver is attached
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>
Diffstat (limited to 'drivers/pci/pci-sysfs.c')
| -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 366d93af051d..788a200fb2dc 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -288,13 +288,16 @@ 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; } |