Peter Wang 7dec5cedf7 scsi: ufs: core: Serialize AHIT register access between sysfs and host driver ... A race exists between ufshcd_auto_hibern8_update() and ufs_mtk_pwr_change_notify() when both paths concurrently access REG_AUTO_HIBERNATE_IDLE_TIMER. Additionally, the static local variable used to save/restore AHIT in the power change path is not re-entrant and may hold a stale value if a sysfs write races with a gear change. Introduce ahit_mutex and ahit_disable_depth in struct ufs_hba to serialize AHIT register access. The depth counter tracks how many host-driver paths have forced AHIT off; sysfs writes are suppressed while it is non-zero and the register is restored from hba->ahit only when the last disabler drops it to zero. Fixes: f5ca8d0c7a ("scsi: ufs: host: mediatek: Disable auto-hibern8 during power mode changes") Signed-off-by: Peter Wang <peter.wang@mediatek.com> Reviewed-by: Chun-Hung Wu <chun-hung.wu@mediatek.com> Link: https://patch.msgid.link/20260914085148.136429-3-peter.wang@mediatek.com Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>		2026-09-25 22:29:41 -04:00
..
ufs_quirks.h	scsi: ufs: core: Remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk	2025-10-21 21:22:17 -04:00
ufs.h	scsi: ufs: core: Dynamically disable timestamp on unsupported devices	2026-09-25 22:22:15 -04:00
ufshcd.h	scsi: ufs: core: Serialize AHIT register access between sysfs and host driver	2026-09-25 22:29:41 -04:00
ufshci.h	scsi: ufs: Add support for the aggregated read query opcode	2026-08-07 11:32:19 -04:00
unipro.h	scsi: ufs: core: Fix bRefClkFreq write failure in HS-LSS mode	2026-04-21 20:58:06 -04:00