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Hans de Goede authored
Sometimes regulator_get() gets called twice for the same supply on the same device. This may happen e.g. when a framework / library is used which uses the regulator; and the driver itself also needs to enable the regulator in some cases where the framework will not enable it. Commit ff268b56 ("regulator: core: Don't spew backtraces on duplicate sysfs") already takes care of the backtrace which would trigger when creating a duplicate consumer symlink under /sys/class/regulator/regulator.%d in this scenario. Commit c33d4423 ("debugfs: make error message a bit more verbose") causes a new error to get logged in this scenario: [ 26.938425] debugfs: Directory 'wm5102-codec-MICVDD' with parent 'spi-WM510204:00-MICVDD' already present! There is no _nowarn variant of debugfs_create_dir(), but we can detect and avoid this problem by checking the return value of the earlier sysfs_create_link_nowarn() call. Add a check for the earlier sysfs_create_link_nowarn() failing with -EEXIST and skip the debugfs_create_dir() call in that case, avoiding this error getting logged. Fixes: c33d4423 ("debugfs: make error message a bit more verbose") Cc: Charles Keepax <ckeepax@opensource.cirrus.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://lore.kernel.org/r/20210122183250.370571-1-hdegoede@redhat.comSigned-off-by: Mark Brown <broonie@kernel.org>
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