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PCI: add pci_try_set_mwi

Browse source 
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 <[email protected]>
Cc: Alan Cox <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Randy Dunlap 2007-07-09 11:55:54 -07:00 • committed by Greg Kroah-Hartman
commit 694625c0b3
11 changed files with 38 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

4
drivers/net/cassini.c
View file

@ -4917,13 +4917,13 @@ static int __devinit cas_init_one(struct pci_dev *pdev,
pci_cmd &= ~PCI_COMMAND_SERR;
pci_cmd |= PCI_COMMAND_PARITY;
pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
if (pci_set_mwi(pdev))
if (pci_try_set_mwi(pdev))
printk(KERN_WARNING PFX "Could not enable MWI for %s\n",
pci_name(pdev));
/*
* On some architectures, the default cache line size set
* by pci_set_mwi reduces perforamnce. We have to increase
* by pci_try_set_mwi reduces perforamnce. We have to increase
* it for this case. To start, we'll print some configuration
* data.
*/

2
drivers/net/starfire.c
View file

@ -740,7 +740,7 @@ static int __devinit starfire_init_one(struct pci_dev *pdev,
pci_set_master(pdev);
/* enable MWI -- it vastly improves Rx performance on sparc64 */
pci_set_mwi(pdev);
pci_try_set_mwi(pdev);
#ifdef ZEROCOPY
/* Starfire can do TCP/UDP checksumming */

2
drivers/net/tulip/tulip_core.c
View file

@ -1155,7 +1155,7 @@ static void __devinit tulip_mwi_config (struct pci_dev *pdev,
/* set or disable MWI in the standard PCI command bit.
* Check for the case where mwi is desired but not available
*/
if (csr0 & MWI) pci_set_mwi(pdev);
if (csr0 & MWI) pci_try_set_mwi(pdev);
else pci_clear_mwi(pdev);
/* read result from hardware (in case bit refused to enable) */

3
drivers/net/wireless/prism54/islpci_hotplug.c
View file

@ -166,8 +166,7 @@ prism54_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_master(pdev);
/* enable MWI */
if (!pci_set_mwi(pdev))
printk(KERN_INFO "%s: pci_set_mwi(pdev) succeeded\n", DRV_NAME);
pci_try_set_mwi(pdev);
/* setup the network device interface and its structure */
if (!(ndev = islpci_setup(pdev))) {