From: Randy Dunlap <randy.dunlap@oracle.com>

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: Greg KH <greg@kroah.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/net/wireless/mac80211/p54/prism54pci.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -puN drivers/net/wireless/mac80211/p54/prism54pci.c~add-pci_try_set_mwi-prism54pci drivers/net/wireless/mac80211/p54/prism54pci.c
--- a/drivers/net/wireless/mac80211/p54/prism54pci.c~add-pci_try_set_mwi-prism54pci
+++ a/drivers/net/wireless/mac80211/p54/prism54pci.c
@@ -540,7 +540,7 @@ static int __devinit p54p_probe(struct p
 	}
 
 	pci_set_master(pdev);
-	pci_set_mwi(pdev);
+	pci_try_set_mwi(pdev);
 
 	pci_write_config_byte(pdev, 0x40, 0);
 	pci_write_config_byte(pdev, 0x41, 0);
_