From 2dea645ffc21f927067e8e35147985887b1a843d Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Wed, 28 Nov 2018 13:45:25 +0200 Subject: i2c: acpi: Return error pointers from i2c_acpi_new_device() The caller would like to know the reason why the i2c_acpi_new_device() fails. For example, if adapter is not available, it might be in the future and we would like to re-probe the clients again. But at the same time we would like to bail out if the error seems unrecoverable, such as invalid argument supplied. To achieve this, return error pointer in some cases. Signed-off-by: Andy Shevchenko Reviewed-by: Heikki Krogerus Reviewed-by: Hans de Goede Acked-by: Mika Westerberg Acked-by: Wolfram Sang --- drivers/i2c/i2c-core-acpi.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index 32affd3fa8bd..689c0c467e97 100644 --- a/drivers/i2c/i2c-core-acpi.c +++ b/drivers/i2c/i2c-core-acpi.c @@ -386,20 +386,22 @@ struct notifier_block i2c_acpi_notifier = { * * Also see i2c_new_device, which this function calls to create the i2c-client. * - * Returns a pointer to the new i2c-client, or NULL if the adapter is not found. + * Returns a pointer to the new i2c-client, or error pointer in case of failure. + * Specifically, -EPROBE_DEFER is returned if the adapter is not found. */ struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, struct i2c_board_info *info) { struct i2c_acpi_lookup lookup; struct i2c_adapter *adapter; + struct i2c_client *client; struct acpi_device *adev; LIST_HEAD(resource_list); int ret; adev = ACPI_COMPANION(dev); if (!adev) - return NULL; + return ERR_PTR(-EINVAL); memset(&lookup, 0, sizeof(lookup)); lookup.info = info; @@ -408,16 +410,23 @@ struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, ret = acpi_dev_get_resources(adev, &resource_list, i2c_acpi_fill_info, &lookup); + if (ret < 0) + return ERR_PTR(ret); + acpi_dev_free_resource_list(&resource_list); - if (ret < 0 || !info->addr) - return NULL; + if (!info->addr) + return ERR_PTR(-EADDRNOTAVAIL); adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); if (!adapter) - return NULL; + return ERR_PTR(-EPROBE_DEFER); + + client = i2c_new_device(adapter, info); + if (!client) + return ERR_PTR(-ENODEV); - return i2c_new_device(adapter, info); + return client; } EXPORT_SYMBOL_GPL(i2c_acpi_new_device); -- cgit v1.2.3-59-g8ed1b