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authorRandy Dunlap <randy.dunlap@oracle.com>2007-07-09 11:55:54 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-11 16:02:11 -0700
commit694625c0b322905d6892fad873029f764cd4823f (patch)
treec48ac2c0095f2ac4044bd12b27ea318eb6156c73 /Documentation/pci.txt
parentf5609d7e679db3f29433f56e1f2e397a2f815288 (diff)
downloadlinux-694625c0b322905d6892fad873029f764cd4823f.tar.bz2
PCI: add pci_try_set_mwi
As suggested by Andrew, add pci_try_set_mwi(), which does not require return-value checking. - add pci_try_set_mwi() without __must_check - make it return 0 on success, errno if the "try" failed or error - review callers Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/pci.txt')
-rw-r--r--Documentation/pci.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/pci.txt b/Documentation/pci.txt
index 7d3da30ff0b4..7754f5aea4e9 100644
--- a/Documentation/pci.txt
+++ b/Documentation/pci.txt
@@ -296,7 +296,10 @@ If the PCI device can use the PCI Memory-Write-Invalidate transaction,
call pci_set_mwi(). This enables the PCI_COMMAND bit for Mem-Wr-Inval
and also ensures that the cache line size register is set correctly.
Check the return value of pci_set_mwi() as not all architectures
-or chip-sets may support Memory-Write-Invalidate.
+or chip-sets may support Memory-Write-Invalidate. Alternatively,
+if Mem-Wr-Inval would be nice to have but is not required, call
+pci_try_set_mwi() to have the system do its best effort at enabling
+Mem-Wr-Inval.
3.2 Request MMIO/IOP resources