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dm: test: Add a check that all devices have a dev value

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With of-platdata, the driver_info struct is updated with the device
pointer when it is bound. This makes it easy for a device to be found by
its driver info with the device_get_by_driver_info() function.

Add a test that all devices (except the root device) have such an entry.
Fix a bug that the function does not set *devp to NULL on failure, which
the documentation asserts.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-10-03 11:31:31 -06:00
parent b325248c93
commit 36af37b936
2 changed files with 82 additions and 0 deletions
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1
drivers/core/device.c
View file

@ -767,6 +767,7 @@ int device_get_by_driver_info(const struct driver_info *info,
struct udevice *dev;
dev = info->dev;
*devp = NULL;
return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
}

81
test/dm/of_platdata.c
View file

@ -86,3 +86,84 @@ static int dm_test_of_platdata_props(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_of_platdata_props, UT_TESTF_SCAN_PDATA);
/*
* find_driver_info - recursively find the driver_info for a device
*
* This sets found[idx] to true when it finds the driver_info record for a
* device, where idx is the index in the driver_info linker list.
*
* @uts: Test state
* @parent: Parent to search
* @found: bool array to update
* @return 0 if OK, non-zero on error
*/
static int find_driver_info(struct unit_test_state *uts, struct udevice *parent,
bool found[])
{
struct udevice *dev;
/* If not the root device, find the entry that caused it to be bound */
if (parent->parent) {
const struct driver_info *info =
ll_entry_start(struct driver_info, driver_info);
const int n_ents =
ll_entry_count(struct driver_info, driver_info);
const struct driver_info *entry;
int idx = -1;
for (entry = info; entry != info + n_ents; entry++) {
if (entry->dev == parent) {
idx = entry - info;
found[idx] = true;
break;
}
}
ut_assert(idx != -1);
}
device_foreach_child(dev, parent) {
int ret;
ret = find_driver_info(uts, dev, found);
if (ret < 0)
return ret;
}
return 0;
}
/* Check that every device is recorded in its driver_info struct */
static int dm_test_of_platdata_dev(struct unit_test_state *uts)
{
const struct driver_info *info =
ll_entry_start(struct driver_info, driver_info);
const int n_ents = ll_entry_count(struct driver_info, driver_info);
bool found[n_ents];
uint i;
/* Record the indexes that are found */
memset(found, '\0', sizeof(found));
ut_assertok(find_driver_info(uts, gd->dm_root, found));
/* Make sure that the driver entries without devices have no ->dev */
for (i = 0; i < n_ents; i++) {
const struct driver_info *entry = info + i;
struct udevice *dev;
if (found[i]) {
/* Make sure we can find it */
ut_assertnonnull(entry->dev);
ut_assertok(device_get_by_driver_info(entry, &dev));
ut_asserteq_ptr(dev, entry->dev);
} else {
ut_assertnull(entry->dev);
ut_asserteq(-ENOENT,
device_get_by_driver_info(entry, &dev));
}
}
return 0;
}
DM_TEST(dm_test_of_platdata_dev, UT_TESTF_SCAN_PDATA);