Phosphor Hwmon not work

[Henbin Chang]

Hi All,

We found the 'Phosphor Hwmon Poller' would terminate with the error message.

Mar 15 09:45:04  systemd[1]: Started Phosphor Hwmon Poller.
Mar 15 09:45:06  phosphor-hwmon-readd[1137]: terminate called after
throwing an instance of 'std::filesystem::__cxx11::filesystem_error'
Mar 15 09:45:06  phosphor-hwmon-readd[1137]:   what():  filesystem error:
recursive directory iterator cannot open directory: No such file or
directory [/ahb/a
pb/i2c at 1e78a000/i2c-bus at 1c0/tmp421 at 4f]
Mar 15 09:45:07  systemd[1]:
[[0;1;39m[[0;1;31m[[0;1;39mxyz.openbmc_project.Hwmon@
-ahb-apb-i2c at 1e78a000-i2c\x2dbus at 1c0-tmp421@4f.service: Main process exited,
code=killed, status=6/ABRT[[0m
Mar 15 09:45:07  systemd[1]:
[[0;1;39m[[0;1;31m[[0;1;39mxyz.openbmc_project.Hwmon@
-ahb-apb-i2c at 1e78a000-i2c\x2dbus at 1c0-tmp421@4f.service: Failed with result
's
ignal'.[[0m
Mar 15 09:45:08  systemd[1]: xyz.openbmc_project.Hwmon@
-ahb-apb-i2c at 1e78a000-i2c\x2dbus at 1c0-tmp421@4f.service: Service
RestartSec=1s expired, scheduling restar
t.
Mar 15 09:45:08  systemd[1]: xyz.openbmc_project.Hwmon@
-ahb-apb-i2c at 1e78a000-i2c\x2dbus at 1c0-tmp421@4f.service: Scheduled restart
job, restart counter is at 2.
Mar 15 09:45:10  systemd[1]: Stopped Phosphor Hwmon Poller.

We confirmed it's caused by the latest commit of phosphor-hwmon repository

commit 9e997b4da98725401769ef82fe26e11c46a059d9
Author: Patrick Venture <venture at google.com>
Date:   Fri Mar 8 13:42:10 2019 -0800

    use filesystem instead of experimental

    Use filesystem now that it should be available instead of
    experimental::filesystem.

    Change-Id: I62838b343ce34f85a47661f1eaaff3c7e6338bbf
    Signed-off-by: Patrick Venture <venture at google.com>

it would work if we reverted that commit.

# ps | grep readd
    2 root         0 SW   [kthreadd]
 1106 root      7668 S    phosphor-hwmon-readd -o /ahb/apb/i2c at 1e78a000
/i2c-bus at 1c0/tmp421 at 4f

Can anyone give the suggestion?

Thanks.
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