c3df83e01a
While determining the next PCI function is factored out of pci_scan_slot() into next_fn(), the former still handles the first function as a special case, which duplicates the code from the scan loop. Furthermore the non-ARI branch of next_fn() is generally hard to understand and especially the check for multifunction devices is hidden in the handling of NULL devices for non-contiguous multifunction. It also signals that no further functions need to be scanned by returning 0 via wraparound and this is a valid function number. Improve upon this by transforming the conditions in next_fn() to be easier to understand. By changing next_fn() to return -ENODEV instead of 0 when there is no next function we can then handle the initial function inside the loop and deduplicate the shared handling. This also makes it more explicit that only function 0 must exist. No functional change is intended. Link: https://lore.kernel.org/r/20220628143100.3228092-2-schnelle@linux.ibm.com Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: Jan Kiszka <jan.kiszka@siemens.com> |
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| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.