driver core: hold dev's parent lock when needed

SoC have internal I/O buses that can't be proved for devices. The
devices on the buses can be accessed directly without additinal
configuration required. This type of bus is represented as
"simple-bus". In some platforms, we name "soc" with "simple-bus"
attribute and many devices are hooked under it described in DT
(device tree).

In commit bf74ad5bc417 ("Hold the device's parent's lock during
probe and remove") to solve USB subsystem lock sequence since
USB device's characteristic. Thus "soc" needs to be locked
whenever a device and driver's probing happen under "soc" bus.
During this period, an async driver tries to probe a device which
is under the "soc" bus would be blocked until previous driver
finish the probing and release "soc" lock. And the next probing
under the "soc" bus need to wait for async finish. Because of
that, driver's async probe for init time improvement will be
shadowed.

Since many devices don't have USB devices' characteristic, they
actually don't need parent's lock. Thus, we introduce a lock flag
in bus_type struct and driver core would lock the parent lock base
on the flag. For USB, we set this flag in usb_bus_type to keep
original lock behavior in driver core.

Async probe could have more benefit after this patch.

Signed-off-by: Martin Liu <liumartin@google.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index ef6183306b4067d3fce4d589d540c6887d82bb78..8bfd27ec73d60d1d18a43f9bfcff29b4eb9a50a6 100644 (file)
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -184,10 +184,10 @@ static ssize_t unbind_store(struct device_driver *drv, const char *buf,
 
        dev = bus_find_device_by_name(bus, NULL, buf);
        if (dev && dev->driver == drv) {
-               if (dev->parent)        /* Needed for USB */
+               if (dev->parent && dev->bus->need_parent_lock)
                        device_lock(dev->parent);
                device_release_driver(dev);
-               if (dev->parent)
+               if (dev->parent && dev->bus->need_parent_lock)
                        device_unlock(dev->parent);
                err = count;
        }
@@ -211,12 +211,12 @@ static ssize_t bind_store(struct device_driver *drv, const char *buf,
 
        dev = bus_find_device_by_name(bus, NULL, buf);
        if (dev && dev->driver == NULL && driver_match_device(drv, dev)) {
-               if (dev->parent)        /* Needed for USB */
+               if (dev->parent && bus->need_parent_lock)
                        device_lock(dev->parent);
                device_lock(dev);
                err = driver_probe_device(drv, dev);
                device_unlock(dev);
-               if (dev->parent)
+               if (dev->parent && bus->need_parent_lock)
                        device_unlock(dev->parent);
 
                if (err > 0) {
@@ -735,10 +735,10 @@ static int __must_check bus_rescan_devices_helper(struct device *dev,
        int ret = 0;
 
        if (!dev->driver) {
-               if (dev->parent)        /* Needed for USB */
+               if (dev->parent && dev->bus->need_parent_lock)
                        device_lock(dev->parent);
                ret = device_attach(dev);
-               if (dev->parent)
+               if (dev->parent && dev->bus->need_parent_lock)
                        device_unlock(dev->parent);
        }
        return ret < 0 ? ret : 0;
@@ -770,10 +770,10 @@ EXPORT_SYMBOL_GPL(bus_rescan_devices);
 int device_reprobe(struct device *dev)
 {
        if (dev->driver) {
-               if (dev->parent)        /* Needed for USB */
+               if (dev->parent && dev->bus->need_parent_lock)
                        device_lock(dev->parent);
                device_release_driver(dev);
-               if (dev->parent)
+               if (dev->parent && dev->bus->need_parent_lock)
                        device_unlock(dev->parent);
        }
        return bus_rescan_devices_helper(dev, NULL);

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index c9f54089429bde006fad1135017d49a0422fefa5..7c09f73b96f367059e469bb311394dd6fb59388a 100644 (file)
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -817,13 +817,13 @@ static int __driver_attach(struct device *dev, void *data)
                return ret;
        } /* ret > 0 means positive match */
 
-       if (dev->parent)        /* Needed for USB */
+       if (dev->parent && dev->bus->need_parent_lock)
                device_lock(dev->parent);
        device_lock(dev);
        if (!dev->driver)
                driver_probe_device(drv, dev);
        device_unlock(dev);
-       if (dev->parent)
+       if (dev->parent && dev->bus->need_parent_lock)
                device_unlock(dev->parent);
 
        return 0;
@@ -919,7 +919,7 @@ void device_release_driver_internal(struct device *dev,
                                    struct device_driver *drv,
                                    struct device *parent)
 {
-       if (parent)
+       if (parent && dev->bus->need_parent_lock)
                device_lock(parent);
 
        device_lock(dev);
@@ -927,7 +927,7 @@ void device_release_driver_internal(struct device *dev,
                __device_release_driver(dev, parent);
 
        device_unlock(dev);
-       if (parent)
+       if (parent && dev->bus->need_parent_lock)
                device_unlock(parent);
 }
 

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 9792cedfc3519a0f0f1c5f1a733c196a1c1bf5a7..e76e95f62f7628a907d0132c31261b2ffc641e49 100644 (file)
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1922,4 +1922,5 @@ struct bus_type usb_bus_type = {
        .name =         "usb",
        .match =        usb_device_match,
        .uevent =       usb_uevent,
+       .need_parent_lock =     true,
 };

diff --git a/include/linux/device.h b/include/linux/device.h
index 477956990f5e3dc703df3154ef06ed3a5e3264d0..beca424395dd36f83b6253993d8f3434b19e23a0 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -98,6 +98,8 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  * @lock_key:  Lock class key for use by the lock validator
  * @force_dma: Assume devices on this bus should be set up by dma_configure()
  *             even if DMA capability is not explicitly described by firmware.
+ * @need_parent_lock:  When probing or removing a device on this bus, the
+ *                     device core should lock the device's parent.
  *
  * A bus is a channel between the processor and one or more devices. For the
  * purposes of the device model, all devices are connected via a bus, even if
@@ -138,6 +140,7 @@ struct bus_type {
        struct lock_class_key lock_key;
 
        bool force_dma;
+       bool need_parent_lock;
 };
 
 extern int __must_check bus_register(struct bus_type *bus);