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| author | Joseph Shifflett <joseph.shifflett@hpe.com> | 2015-10-06 20:55:31 +0000 |
|---|---|---|
| committer | lersek <lersek@Edk2> | 2015-10-06 20:55:31 +0000 |
| commit | 25a2664625f892e4a35cdb57a567e060bcde043c (patch) | |
| tree | 45175d9ab9de186c594b4e2c4b82363dfd1f7b61 /DuetPkg | |
| parent | c5a693cea60823e0a3df5a3e92604e4e8936c84a (diff) | |
| download | edk2-25a2664625f892e4a35cdb57a567e060bcde043c.tar.gz edk2-25a2664625f892e4a35cdb57a567e060bcde043c.tar.bz2 edk2-25a2664625f892e4a35cdb57a567e060bcde043c.zip | |
MdeModulePkg: exit pci function loops early if device is not multi-function
When looping through all PCI functions, code should not look for functions
1-7 if function 0 is not present or if function 0 indicates the device is
not multifunction. Prior to this fix the code would use stale data in a
buffer to determine if a device is multifunction even if function 0 is not
present. This fixes a code bug and provides very small performance
improvements.
PCI 2.3 Specification states: They [multifunction devices] are also
required to always implement function 0 in the device. Implementing other
functions is optional and may be assigned in any order.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Joseph Shifflett <joseph.shifflett@hpe.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18574 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'DuetPkg')
0 files changed, 0 insertions, 0 deletions