spi: add devm_spi_optimize_message() helper

Merge series from David Lechner <dlechner@baylibre.com>:

In the IIO subsystem, we are finding that it is common to call
spi_optimize_message() during driver probe since the SPI message
doesn't change for the lifetime of the driver. This patch adds a
devm_spi_optimize_message() helper to simplify this common pattern.

1 files changed, 3 insertions, 45 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 131d96c6090b..2b4c0624b704 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2739,8 +2739,11 @@ static ssize_t uevent_show(struct device *dev, struct device_attribute *attr,
 	if (!env)
 		return -ENOMEM;
 
+	/* Synchronize with really_probe() */
+	device_lock(dev);
 	/* let the kset specific function add its keys */
 	retval = kset->uevent_ops->uevent(&dev->kobj, env);
+	device_unlock(dev);
 	if (retval)
 		goto out;
 
@@ -2845,15 +2848,6 @@ static void devm_attr_group_remove(struct device *dev, void *res)
 	sysfs_remove_group(&dev->kobj, group);
 }
 
-static void devm_attr_groups_remove(struct device *dev, void *res)
-{
-	union device_attr_group_devres *devres = res;
-	const struct attribute_group **groups = devres->groups;
-
-	dev_dbg(dev, "%s: removing groups %p\n", __func__, groups);
-	sysfs_remove_groups(&dev->kobj, groups);
-}
-
 /**
  * devm_device_add_group - given a device, create a managed attribute group
  * @dev:	The device to create the group for
@@ -2886,42 +2880,6 @@ int devm_device_add_group(struct device *dev, const struct attribute_group *grp)
 }
 EXPORT_SYMBOL_GPL(devm_device_add_group);
 
-/**
- * devm_device_add_groups - create a bunch of managed attribute groups
- * @dev:	The device to create the group for
- * @groups:	The attribute groups to create, NULL terminated
- *
- * This function creates a bunch of managed attribute groups.  If an error
- * occurs when creating a group, all previously created groups will be
- * removed, unwinding everything back to the original state when this
- * function was called.  It will explicitly warn and error if any of the
- * attribute files being created already exist.
- *
- * Returns 0 on success or error code from sysfs_create_group on failure.
- */
-int devm_device_add_groups(struct device *dev,
-			   const struct attribute_group **groups)
-{
-	union device_attr_group_devres *devres;
-	int error;
-
-	devres = devres_alloc(devm_attr_groups_remove,
-			      sizeof(*devres), GFP_KERNEL);
-	if (!devres)
-		return -ENOMEM;
-
-	error = sysfs_create_groups(&dev->kobj, groups);
-	if (error) {
-		devres_free(devres);
-		return error;
-	}
-
-	devres->groups = groups;
-	devres_add(dev, devres);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(devm_device_add_groups);
-
 static int device_add_attrs(struct device *dev)
 {
 	const struct class *class = dev->class;