16b6c8bb68
When removing a device, for example a VF being removed due to SR-IOV teardown, a "soft" hot-unplug via 'echo 1 > remove' in sysfs, or an actual hot-unplug, we first remove the procfs and sysfs attributes for the device before attempting to release the device from any driver bound to it. Unbinding the driver from the device can take time. The device might need to write out data or it might be actively in use. If it's in use by userspace through a vfio driver, the unbind might block until the user releases the device. This leads to a potentially non-trivial amount of time where the device exists, but we've torn down the interfaces that userspace uses to examine devices, for instance lspci might generate this sort of error: pcilib: Cannot open /sys/bus/pci/devices/0000:01:0a.3/config lspci: Unable to read the standard configuration space header of device 0000:01:0a.3 We don't seem to have any dependence on this teardown ordering in the kernel, so let's unbind the driver first, which is also more symmetric with the instantiation of the device in pci_bus_add_device(). Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> |
||
|---|---|---|
| Documentation | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.