netdev - [BUG] ptp: ocp: Warning when the ptp

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Message-ID: <CAMhUBjnAeLsZmhOmJnbnrqQNJn=i4Xx6P4iwh0YKW9gUM9U+KA@mail.gmail.com>
Date:   Sun, 10 Apr 2022 14:08:56 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     richardcochran@...il.com, jonathan.lemon@...il.com
Cc:     netdev@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] ptp: ocp: Warning when the ptp_ocp driver fails to probe

Hello,

I found a bug in the ptp_ocp driver.
When the ptp_ocp driver fails to probe at the function
ptp_clock_register(), we will get the following splat:

[    3.354719] ptp_ocp 0000:00:05.0: clock not enabled
[    3.355127] ptp_ocp 0000:00:05.0: Could not register (null): err -19
[    3.358800] ------------[ cut here ]------------
[    3.359200] sysfs group 'gen1' not found for kobject 'ocp0'
[    3.359671] WARNING: CPU: 6 PID: 256 at fs/sysfs/group.c:280
sysfs_remove_group+0x9f/0x220
[    3.366602] RIP: 0010:sysfs_remove_group+0x9f/0x220
[    3.375709] Call Trace:
[    3.375920]  <TASK>
[    3.376119]  ptp_ocp_detach+0x117/0xe60 [ptp_ocp]
[    3.376568]  ptp_ocp_probe+0xb1f/0x1830 [ptp_ocp]
[    3.376967]  ? rcu_read_lock_sched_held+0x2f/0x70
[    3.377379]  ? lockdep_hardirqs_on_prepare+0x347/0x620
[    3.377810]  ? _raw_spin_unlock_irqrestore+0x2d/0x60
[    3.378277]  ? lockdep_hardirqs_on+0x7b/0x100
[    3.378646]  ? _raw_spin_unlock_irqrestore+0x3d/0x60
[    3.379063]  ? ptp_ocp_i2c_notifier_call+0x1c0/0x1c0 [ptp_ocp]
[    3.379558]  pci_device_probe+0x40e/0x8d0

Regards,
Zheyu Ma