scsi: ufs: core: Cancel RTC work during ufshcd_remove()

commit 1695c436 upstream.

Currently, RTC work is only cancelled during __ufshcd_wl_suspend(). When
ufshcd is removed in ufshcd_remove(), RTC work is not cancelled. Due to
this, any further trigger of the RTC work after ufshcd_remove() would
result in a NULL pointer dereference as below:

Unable to handle kernel NULL pointer dereference at virtual address 00000000000002a4
Workqueue: events ufshcd_rtc_work
Call trace:
 _raw_spin_lock_irqsave+0x34/0x8c
 pm_runtime_get_if_active+0x24/0xb4
 ufshcd_rtc_work+0x124/0x19c
 process_scheduled_works+0x18c/0x2d8
 worker_thread+0x144/0x280
 kthread+0x11c/0x128
 ret_from_fork+0x10/0x20

Since RTC work accesses the ufshcd internal structures, it should be cancelled
when ufshcd is removed. So do that in ufshcd_remove(), as per the order in
ufshcd_init().

Cc: stable@vger.kernel.org # 6.8
Fixes: 6bf999e0 ("scsi: ufs: core: Add UFS RTC support")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20241111-ufs_bug_fix-v1-1-45ad8b62f02e@linaro.org


Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>