System crash after direct call to sd_open() from emcp function

Issue

• System crash after direct call to sd_open() from emcp function:

[4985235.104943] WARNING: CPU: 2 PID: 27087 at lib/kobject.c:581 kobject_get+0x50/0x80
[4985235.104967] BUG: unable to handle kernel paging request at 0000000074010070
[4985235.105313] IP: [<ffffffff89f8fddd>] strnlen+0xd/0x40
[4985235.105639] PGD 0 
[4985235.105956] Oops: 0000 [#1] SMP 
....
[4985235.110336] CPU: 2 PID: 27087 Comm: kworker/u128:0 Kdump: loaded Tainted: P           OE  ------------   3.10.0-1160.el7.x86_64 #1
[4985235.111321] Hardware name: HPE ProLiant DL560 Gen10/ProLiant DL560 Gen10, BIOS U34 03/09/2020
[4985235.111846] Workqueue: scsi_wq_7 fc_scsi_scan_rport [scsi_transport_fc]
[4985235.112356] task: ffff8f1a19672100 ti: ffff8ee7e4888000 task.ti: ffff8ee7e4888000
[4985235.112876] RIP: 0010:[<ffffffff89f8fddd>]  [<ffffffff89f8fddd>] strnlen+0xd/0x40
....
[4985235.120134] Call Trace:
[4985235.120711]  [<ffffffff89f91b8b>] string.isra.7+0x3b/0xf0
[4985235.121290]  [<ffffffff89f932a1>] vsnprintf+0x201/0x6a0
[4985235.121869]  [<ffffffff89f9374d>] vscnprintf+0xd/0x30
[4985235.122469]  [<ffffffff89c9de2b>] vprintk_emit+0x11b/0x510
[4985235.123064]  [<ffffffff89c9e489>] ? vprintk_default+0x29/0x40
[4985235.123650]  [<ffffffff89f88830>] ? kobject_get+0x50/0x80
[4985235.124210]  [<ffffffff89c9e23f>] vprintk+0x1f/0x30
[4985235.124793]  [<ffffffff89c9b1cf>] __warn+0x7f/0x100
[4985235.125368]  [<ffffffff89c9b2af>] warn_slowpath_fmt+0x5f/0x80
[4985235.125943]  [<ffffffff89de3a2f>] ? pcpu_chunk_relocate+0x1f/0x40
[4985235.126505]  [<ffffffff89f88830>] kobject_get+0x50/0x80
[4985235.127083]  [<ffffffff8a0b5a97>] get_device+0x17/0x30
[4985235.127650]  [<ffffffff8a0e2cbc>] scsi_device_get+0x2c/0x60
[4985235.128213]  [<ffffffffc04025fa>] scsi_disk_get.isra.31+0x2a/0x60 [sd_mod]
[4985235.128774]  [<ffffffffc0402829>] sd_open+0x29/0x1b0 [sd_mod]
[4985235.129314]  [<ffffffffc104da4c>] emcp_native_bdops_open.isra.11+0x3c/0x70 [emcp]
[4985235.129854]  [<ffffffffc10518e3>] emcp_reenable_io+0x2f3/0x440 [emcp]
[4985235.130407]  [<ffffffffc10505bd>] ? EmsDeviceIdClose+0x2d/0x30 [emcp]
[4985235.130984]  [<ffffffffc1058a81>] ? EmcpLnxIsPowerDevConfigured+0x91/0xa0 [emcp]
[4985235.131540]  [<ffffffffc10652a7>] emcp_add_common.constprop.30+0x607/0x7a0 [emcp]
[4985235.132057]  [<ffffffff89ccd417>] ? async_synchronize_cookie_domain+0xb7/0x150
[4985235.132563]  [<ffffffff89cc6d10>] ? wake_up_atomic_t+0x30/0x30
[4985235.133057]  [<ffffffffc1068603>] emcp_add+0x193/0x300 [emcp]
[4985235.133563]  [<ffffffffc10687bc>] emcp_chg_device_notify+0x4c/0x60 [emcp]
[4985235.134044]  [<ffffffff8a38eb6f>] notifier_call_chain+0x4f/0x70
[4985235.134510]  [<ffffffff89ccbfdd>] __blocking_notifier_call_chain+0x4d/0x70
[4985235.134967]  [<ffffffff89ccc016>] blocking_notifier_call_chain+0x16/0x20
[4985235.135411]  [<ffffffff8a0baeb4>] driver_bound+0x84/0x100
[4985235.135839]  [<ffffffff8a0bb1c4>] driver_probe_device+0xd4/0x3e0
[4985235.136258]  [<ffffffff8a0bb4d0>] ? driver_probe_device+0x3e0/0x3e0
[4985235.136672]  [<ffffffff8a0bb513>] __device_attach+0x43/0x50
[4985235.137056]  [<ffffffff8a0b8e35>] bus_for_each_drv+0x75/0xc0
[4985235.137452]  [<ffffffff8a0baff0>] device_attach+0x90/0xb0
[4985235.137833]  [<ffffffff8a0ba218>] bus_probe_device+0x98/0xd0
[4985235.138207]  [<ffffffff8a0b7abf>] device_add+0x4ff/0x7c0
[4985235.138578]  [<ffffffff8a0c665c>] ? __pm_runtime_resume+0x5c/0x90
[4985235.138946]  [<ffffffff8a0f2b2c>] scsi_sysfs_add_sdev+0x8c/0x290
[4985235.139318]  [<ffffffff8a0efbce>] scsi_probe_and_add_lun+0xc4e/0xe50
[4985235.139672]  [<ffffffff8a0f0182>] scsi_report_lun_scan+0x3b2/0x540
[4985235.140023]  [<ffffffff8a0c665c>] ? __pm_runtime_resume+0x5c/0x90
[4985235.140372]  [<ffffffff8a0f0741>] __scsi_scan_target+0x121/0x260
[4985235.140716]  [<ffffffff8a0f0998>] scsi_scan_target+0x118/0x130
[4985235.141060]  [<ffffffffc02e0f2b>] fc_scsi_scan_rport+0xbb/0xc0 [scsi_transport_fc]
....