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-rw-r--r--lib/test_firmware.c92
1 files changed, 62 insertions, 30 deletions
diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index a3e8ec3fb1c5..09371b0a9baf 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -42,12 +42,6 @@ static const struct file_operations test_fw_fops = {
.read = test_fw_misc_read,
};
-static struct miscdevice test_fw_misc_device = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "test_firmware",
- .fops = &test_fw_fops,
-};
-
static ssize_t trigger_request_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@@ -132,39 +126,81 @@ out:
}
static DEVICE_ATTR_WO(trigger_async_request);
-static int __init test_firmware_init(void)
+static ssize_t trigger_custom_fallback_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
int rc;
+ char *name;
- rc = misc_register(&test_fw_misc_device);
+ name = kstrndup(buf, count, GFP_KERNEL);
+ if (!name)
+ return -ENOSPC;
+
+ pr_info("loading '%s' using custom fallback mechanism\n", name);
+
+ mutex_lock(&test_fw_mutex);
+ release_firmware(test_firmware);
+ test_firmware = NULL;
+ rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, name,
+ dev, GFP_KERNEL, NULL,
+ trigger_async_request_cb);
if (rc) {
- pr_err("could not register misc device: %d\n", rc);
- return rc;
+ pr_info("async load of '%s' failed: %d\n", name, rc);
+ kfree(name);
+ goto out;
}
- rc = device_create_file(test_fw_misc_device.this_device,
- &dev_attr_trigger_request);
- if (rc) {
- pr_err("could not create sysfs interface: %d\n", rc);
- goto dereg;
+ /* Free 'name' ASAP, to test for race conditions */
+ kfree(name);
+
+ wait_for_completion(&async_fw_done);
+
+ if (test_firmware) {
+ pr_info("loaded: %zu\n", test_firmware->size);
+ rc = count;
+ } else {
+ pr_err("failed to async load firmware\n");
+ rc = -ENODEV;
}
- rc = device_create_file(test_fw_misc_device.this_device,
- &dev_attr_trigger_async_request);
+out:
+ mutex_unlock(&test_fw_mutex);
+
+ return rc;
+}
+static DEVICE_ATTR_WO(trigger_custom_fallback);
+
+#define TEST_FW_DEV_ATTR(name) &dev_attr_##name.attr
+
+static struct attribute *test_dev_attrs[] = {
+ TEST_FW_DEV_ATTR(trigger_request),
+ TEST_FW_DEV_ATTR(trigger_async_request),
+ TEST_FW_DEV_ATTR(trigger_custom_fallback),
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(test_dev);
+
+static struct miscdevice test_fw_misc_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "test_firmware",
+ .fops = &test_fw_fops,
+ .groups = test_dev_groups,
+};
+
+static int __init test_firmware_init(void)
+{
+ int rc;
+
+ rc = misc_register(&test_fw_misc_device);
if (rc) {
- pr_err("could not create async sysfs interface: %d\n", rc);
- goto remove_file;
+ pr_err("could not register misc device: %d\n", rc);
+ return rc;
}
pr_warn("interface ready\n");
return 0;
-
-remove_file:
- device_remove_file(test_fw_misc_device.this_device,
- &dev_attr_trigger_async_request);
-dereg:
- misc_deregister(&test_fw_misc_device);
- return rc;
}
module_init(test_firmware_init);
@@ -172,10 +208,6 @@ module_init(test_firmware_init);
static void __exit test_firmware_exit(void)
{
release_firmware(test_firmware);
- device_remove_file(test_fw_misc_device.this_device,
- &dev_attr_trigger_async_request);
- device_remove_file(test_fw_misc_device.this_device,
- &dev_attr_trigger_request);
misc_deregister(&test_fw_misc_device);
pr_warn("removed interface\n");
}