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regulator: core: Streamline debugfs operations

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If CONFIG_DEBUG_FS is not set:

    regulator: Failed to create debugfs directory
    ...
    regulator-dummy: Failed to create debugfs directory

As per the comments for debugfs_create_dir(), errors returned by this
function should be expected, and ignored:

 * If debugfs is not enabled in the kernel, the value -%ENODEV will be
 * returned.
 *
 * NOTE: it's expected that most callers should _ignore_ the errors returned
 * by this function. Other debugfs functions handle the fact that the "dentry"
 * passed to them could be an error and they don't crash in that case.
 * Drivers should generally work fine even if debugfs fails to init anyway.

Adhere to the debugfs spirit, and streamline all operations by:
  1. Demoting the importance of the printed error messages to debug
     level, like is already done in create_regulator(),
  2. Further ignoring any returned errors, as by design, all debugfs
     functions are no-ops when passed an error pointer.

Fixes: 2bf1c45be3 ("regulator: Fix error checking for debugfs_create_dir")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/2f8bb6e113359ddfab7b59e4d4274bd4c06d6d0a.1685013051.git.geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2023-05-25 13:13:59 +02:00 committed by Mark Brown
parent 2715bb11cf
commit 08880713ce
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 13 additions and 17 deletions
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30
drivers/regulator/core.c
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@ -1911,19 +1911,17 @@ static struct regulator *create_regulator(struct regulator_dev *rdev,
if (err != -EEXIST)
regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs);
if (IS_ERR(regulator->debugfs)) {
if (IS_ERR(regulator->debugfs))
rdev_dbg(rdev, "Failed to create debugfs directory\n");
} else {
debugfs_create_u32("uA_load", 0444, regulator->debugfs,
&regulator->uA_load);
debugfs_create_u32("min_uV", 0444, regulator->debugfs,
&regulator->voltage[PM_SUSPEND_ON].min_uV);
debugfs_create_u32("max_uV", 0444, regulator->debugfs,
&regulator->voltage[PM_SUSPEND_ON].max_uV);
debugfs_create_file("constraint_flags", 0444,
regulator->debugfs, regulator,
&constraint_flags_fops);
}
debugfs_create_u32("uA_load", 0444, regulator->debugfs,
&regulator->uA_load);
debugfs_create_u32("min_uV", 0444, regulator->debugfs,
&regulator->voltage[PM_SUSPEND_ON].min_uV);
debugfs_create_u32("max_uV", 0444, regulator->debugfs,
&regulator->voltage[PM_SUSPEND_ON].max_uV);
debugfs_create_file("constraint_flags", 0444, regulator->debugfs,
regulator, &constraint_flags_fops);
/*
* Check now if the regulator is an always on regulator - if
@ -5256,10 +5254,8 @@ static void rdev_init_debugfs(struct regulator_dev *rdev)
}
rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
if (IS_ERR(rdev->debugfs)) {
rdev_warn(rdev, "Failed to create debugfs directory\n");
return;
}
if (IS_ERR(rdev->debugfs))
rdev_dbg(rdev, "Failed to create debugfs directory\n");
debugfs_create_u32("use_count", 0444, rdev->debugfs,
&rdev->use_count);
@ -6179,7 +6175,7 @@ static int __init regulator_init(void)
debugfs_root = debugfs_create_dir("regulator", NULL);
if (IS_ERR(debugfs_root))
pr_warn("regulator: Failed to create debugfs directory\n");
pr_debug("regulator: Failed to create debugfs directory\n");
#ifdef CONFIG_DEBUG_FS
debugfs_create_file("supply_map", 0444, debugfs_root, NULL,