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>

11 files changed, 38 insertions, 18 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
diff --git a/drivers/ata/pata_cs5530.c b/drivers/ata/pata_cs5530.c
index 3fca5898642b..68f150a1e2f4 100644
--- a/drivers/ata/pata_cs5530.c
+++ b/drivers/ata/pata_cs5530.c
@@ -266,7 +266,7 @@ static int cs5530_init_chip(void)
         }
 
         pci_set_master(cs5530_0);
-        pci_set_mwi(cs5530_0);
+        pci_try_set_mwi(cs5530_0);
 
         /*
          * Set PCI CacheLineSize to 16-bytes:
diff --git a/drivers/ide/pci/cs5530.c b/drivers/ide/pci/cs5530.c
index 1eec1f308d16..b5c00d15a704 100644
--- a/drivers/ide/pci/cs5530.c
+++ b/drivers/ide/pci/cs5530.c
@@ -236,7 +236,7 @@ static unsigned int __devinit init_chipset_cs5530 (struct pci_dev *dev, const ch
          */
 
         pci_set_master(cs5530_0);
-        pci_set_mwi(cs5530_0);
+        pci_try_set_mwi(cs5530_0);
 
         /*
          * Set PCI CacheLineSize to 16-bytes:
diff --git a/drivers/net/cassini.c b/drivers/net/cassini.c
index 805924fc077a..f6e4030c73d1 100644
--- a/drivers/net/cassini.c
+++ b/drivers/net/cassini.c
@@ -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.
          */
diff --git a/drivers/net/starfire.c b/drivers/net/starfire.c
index 786d4b9c07ec..2f69d5c5dfa6 100644
--- a/drivers/net/starfire.c
+++ b/drivers/net/starfire.c
@@ -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 */
diff --git a/drivers/net/tulip/tulip_core.c b/drivers/net/tulip/tulip_core.c
index 1a9e911b86a2..7dcd138b0fed 100644
--- a/drivers/net/tulip/tulip_core.c
+++ b/drivers/net/tulip/tulip_core.c
@@ -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) */
diff --git a/drivers/net/wireless/prism54/islpci_hotplug.c b/drivers/net/wireless/prism54/islpci_hotplug.c
index 25d6c80c9bab..af2e4f2405f2 100644
--- a/drivers/net/wireless/prism54/islpci_hotplug.c
+++ b/drivers/net/wireless/prism54/islpci_hotplug.c
@@ -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))) {
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d9fc1bd1f3e8..35fa30aa3065 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1186,6 +1186,11 @@ int pci_set_mwi(struct pci_dev *dev)
         return 0;
 }
 
+int pci_try_set_mwi(struct pci_dev *dev)
+{
+        return 0;
+}
+
 void pci_clear_mwi(struct pci_dev *dev)
 {
 }
@@ -1242,9 +1247,7 @@ pci_set_cacheline_size(struct pci_dev *dev)
  * pci_set_mwi - enables memory-write-invalidate PCI transaction
  * @dev: the PCI device for which MWI is enabled
  *
- * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND,
- * and then calls @pcibios_set_mwi to do the needed arch specific
- * operations or a generic mwi-prep function.
+ * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
  *
  * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
  */
@@ -1260,7 +1263,8 @@ pci_set_mwi(struct pci_dev *dev)
 
         pci_read_config_word(dev, PCI_COMMAND, &cmd);
         if (! (cmd & PCI_COMMAND_INVALIDATE)) {
-                pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n", pci_name(dev));
+                pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n",
+                        pci_name(dev));
                 cmd |= PCI_COMMAND_INVALIDATE;
                 pci_write_config_word(dev, PCI_COMMAND, cmd);
         }
@@ -1269,6 +1273,21 @@ pci_set_mwi(struct pci_dev *dev)
 }
 
 /**
+ * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
+ * @dev: the PCI device for which MWI is enabled
+ *
+ * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
+ * Callers are not required to check the return value.
+ *
+ * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
+ */
+int pci_try_set_mwi(struct pci_dev *dev)
+{
+        int rc = pci_set_mwi(dev);
+        return rc;
+}
+
+/**
  * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
  * @dev: the PCI device to disable
  *
@@ -1600,6 +1619,7 @@ EXPORT_SYMBOL(pci_release_selected_regions);
 EXPORT_SYMBOL(pci_request_selected_regions);
 EXPORT_SYMBOL(pci_set_master);
 EXPORT_SYMBOL(pci_set_mwi);
+EXPORT_SYMBOL(pci_try_set_mwi);
 EXPORT_SYMBOL(pci_clear_mwi);
 EXPORT_SYMBOL_GPL(pci_intx);
 EXPORT_SYMBOL(pci_set_dma_mask);
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index dcb4ba0ecee1..955b2e48d041 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -1578,10 +1578,7 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
         INIT_LIST_HEAD(&phba->fc_nodes);
 
         pci_set_master(pdev);
-        retval = pci_set_mwi(pdev);
-        if (retval)
-                dev_printk(KERN_WARNING, &pdev->dev,
-                           "Warning: pci_set_mwi returned %d\n", retval);
+        pci_try_set_mwi(pdev);
 
         if (pci_set_dma_mask(phba->pcidev, DMA_64BIT_MASK) != 0)
                 if (pci_set_dma_mask(phba->pcidev, DMA_32BIT_MASK) != 0)
diff --git a/drivers/usb/gadget/net2280.c b/drivers/usb/gadget/net2280.c
index d975ecf18e00..00fda334dc72 100644
--- a/drivers/usb/gadget/net2280.c
+++ b/drivers/usb/gadget/net2280.c
@@ -2964,7 +2964,7 @@ static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id)
                         , &dev->pci->pcimstctl);
         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
         pci_set_master (pdev);
-        pci_set_mwi (pdev);
+        pci_try_set_mwi (pdev);
 
         /* ... also flushes any posted pci writes */
         dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index a6657b7f245d..a5602e26f4dd 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -545,6 +545,7 @@ void pci_set_master(struct pci_dev *dev);
 int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state);
 #define HAVE_PCI_SET_MWI
 int __must_check pci_set_mwi(struct pci_dev *dev);
+int pci_try_set_mwi(struct pci_dev *dev);
 void pci_clear_mwi(struct pci_dev *dev);
 void pci_intx(struct pci_dev *dev, int enable);
 void pci_msi_off(struct pci_dev *dev);