driver core: Avoid pointless deferred probe attempts

There's no point in adding a device to the deferred probe list if we
know for sure that it doesn't have a matching driver. So, check if a
device can match with a driver before adding it to the deferred probe
list.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210302211133.2244281-2-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 66c31cd..83a68e9 100644 (file)
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -122,6 +122,9 @@ static DECLARE_WORK(deferred_probe_work, deferred_probe_work_func);
 
 void driver_deferred_probe_add(struct device *dev)
 {
+       if (!dev->can_match)
+               return;
+
        mutex_lock(&deferred_probe_mutex);
        if (list_empty(&dev->p->deferred_probe)) {
                dev_dbg(dev, "Added to deferred list\n");
@@ -725,6 +728,7 @@ static int driver_probe_device(struct device_driver *drv, struct device *dev)
        if (!device_is_registered(dev))
                return -ENODEV;
 
+       dev->can_match = true;
        pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
                 drv->bus->name, __func__, dev_name(dev), drv->name);
 
@@ -828,6 +832,7 @@ static int __device_attach_driver(struct device_driver *drv, void *_data)
                return 0;
        } else if (ret == -EPROBE_DEFER) {
                dev_dbg(dev, "Device match requests probe deferral\n");
+               dev->can_match = true;
                driver_deferred_probe_add(dev);
        } else if (ret < 0) {
                dev_dbg(dev, "Bus failed to match device: %d\n", ret);
@@ -1063,6 +1068,7 @@ static int __driver_attach(struct device *dev, void *data)
                return 0;
        } else if (ret == -EPROBE_DEFER) {
                dev_dbg(dev, "Device match requests probe deferral\n");
+               dev->can_match = true;
                driver_deferred_probe_add(dev);
        } else if (ret < 0) {
                dev_dbg(dev, "Bus failed to match device: %d\n", ret);

diff --git a/include/linux/device.h b/include/linux/device.h
index a8ce0dc..38a2071 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -439,6 +439,9 @@ struct dev_links_info {
  * @state_synced: The hardware state of this device has been synced to match
  *               the software state of this device by calling the driver/bus
  *               sync_state() callback.
+ * @can_match: The device has matched with a driver at least once or it is in
+ *             a bus (like AMBA) which can't check for matching drivers until
+ *             other devices probe successfully.
  * @dma_coherent: this particular device is dma coherent, even if the
  *             architecture supports non-coherent devices.
  * @dma_ops_bypass: If set to %true then the dma_ops are bypassed for the
@@ -545,6 +548,7 @@ struct device {
        bool                    offline:1;
        bool                    of_node_reused:1;
        bool                    state_synced:1;
+       bool                    can_match:1;
 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
     defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
     defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)