Remove useless get_driver()/put_driver() calls

As part of the removal of get_driver()/put_driver(), this patch
(as1512) gets rid of various useless and unnecessary calls in several
drivers.  In some cases it may be desirable to pin the driver by
calling try_module_get(), but that can be done later.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: "David S. Miller" <davem@davemloft.net>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Michael Buesch <m@bues.ch>
CC: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 5 insertions, 27 deletions

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index f320f466f03b..e8c42d6a7d1c 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -915,9 +915,7 @@ static int phy_probe(struct device *dev)
 
         phydev = to_phy_device(dev);
 
-        /* Make sure the driver is held.
-         * XXX -- Is this correct? */
-        drv = get_driver(phydev->dev.driver);
+        drv = phydev->dev.driver;
         phydrv = to_phy_driver(drv);
         phydev->drv = phydrv;
 
@@ -957,8 +955,6 @@ static int phy_remove(struct device *dev)
 
         if (phydev->drv->remove)
                 phydev->drv->remove(phydev);
-
-        put_driver(dev->driver);
         phydev->drv = NULL;
 
         return 0;
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 7cf3d2fcf56a..6f819988a8da 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -593,7 +593,7 @@ static pci_ers_result_t pcifront_common_process(int cmd,
         }
         pdrv = pcidev->driver;
 
-        if (get_driver(&pdrv->driver)) {
+        if (pdrv->driver) {
                 if (pdrv->err_handler && pdrv->err_handler->error_detected) {
                         dev_dbg(&pcidev->dev,
                                 "trying to call AER service\n");
@@ -623,7 +623,6 @@ static pci_ers_result_t pcifront_common_process(int cmd,
                                 }
                         }
                 }
-                put_driver(&pdrv->driver);
         }
         if (!flag)
                 result = PCI_ERS_RESULT_NONE;
diff --git a/drivers/ssb/main.c b/drivers/ssb/main.c
index bb6317fb925c..ff109ae94767 100644
--- a/drivers/ssb/main.c
+++ b/drivers/ssb/main.c
@@ -140,19 +140,6 @@ static void ssb_device_put(struct ssb_device *dev)
                 put_device(dev->dev);
 }
 
-static inline struct ssb_driver *ssb_driver_get(struct ssb_driver *drv)
-{
-        if (drv)
-                get_driver(&drv->drv);
-        return drv;
-}
-
-static inline void ssb_driver_put(struct ssb_driver *drv)
-{
-        if (drv)
-                put_driver(&drv->drv);
-}
-
 static int ssb_device_resume(struct device *dev)
 {
         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
@@ -250,11 +237,9 @@ int ssb_devices_freeze(struct ssb_bus *bus, struct ssb_freeze_context *ctx)
                         ssb_device_put(sdev);
                         continue;
                 }
-                sdrv = ssb_driver_get(drv_to_ssb_drv(sdev->dev->driver));
-                if (!sdrv || SSB_WARN_ON(!sdrv->remove)) {
-                        ssb_device_put(sdev);
+                sdrv = drv_to_ssb_drv(sdev->dev->driver);
+                if (SSB_WARN_ON(!sdrv->remove))
                         continue;
-                }
                 sdrv->remove(sdev);
                 ctx->device_frozen[i] = 1;
         }
@@ -293,7 +278,6 @@ int ssb_devices_thaw(struct ssb_freeze_context *ctx)
                                    dev_name(sdev->dev));
                         result = err;
                 }
-                ssb_driver_put(sdrv);
                 ssb_device_put(sdev);
         }
 
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index fea790a2b176..13ef2338be41 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -170,7 +170,7 @@ static bool driver_filter(struct device *dev)
                 return false;
 
         /* driver filter on but not yet initialized */
-        drv = get_driver(dev->driver);
+        drv = dev->driver;
         if (!drv)
                 return false;
 
@@ -185,7 +185,6 @@ static bool driver_filter(struct device *dev)
         }
 
         read_unlock_irqrestore(&driver_name_lock, flags);
-        put_driver(drv);
 
         return ret;
 }