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| author | Randy Dunlap | 2007-07-09 20:55:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2007-07-12 01:02:11 +0200 |
| commit | 694625c0b322905d6892fad873029f764cd4823f (patch) | |
| tree | c48ac2c0095f2ac4044bd12b27ea318eb6156c73 /Documentation/pci.txt | |
| parent | PCI: pcie: remove SPIN_LOCK_UNLOCKED (diff) | |
| download | kernel-qcow2-linux-694625c0b322905d6892fad873029f764cd4823f.tar.gz kernel-qcow2-linux-694625c0b322905d6892fad873029f764cd4823f.tar.xz kernel-qcow2-linux-694625c0b322905d6892fad873029f764cd4823f.zip | |
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.txt | 5 |
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 |