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| author | Stanley Chu <stanley.chu@mediatek.com> | 2020-08-09 13:07:34 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-09-03 11:19:25 +0200 |
| commit | 00b94b3e7898ef655501818b7d4883ed4912b5e8 (patch) | |
| tree | fc8e979a775da485ae9de65cbfa015a5fae17c63 /include/linux/debugobjects.h | |
| parent | c86b5b56fb1b356b8f71973b6ac6bd9bfb842f2c (diff) | |
scsi: ufs: Fix possible infinite loop in ufshcd_hold
[ Upstream commit 93b6c5db06028a3b55122bbb74d0715dd8ca4ae0 ]
In ufshcd_suspend(), after clk-gating is suspended and link is set
as Hibern8 state, ufshcd_hold() is still possibly invoked before
ufshcd_suspend() returns. For example, MediaTek's suspend vops may
issue UIC commands which would call ufshcd_hold() during the command
issuing flow.
Now if UFSHCD_CAP_HIBERN8_WITH_CLK_GATING capability is enabled,
then ufshcd_hold() may enter infinite loops because there is no
clk-ungating work scheduled or pending. In this case, ufshcd_hold()
shall just bypass, and keep the link as Hibern8 state.
Link: https://lore.kernel.org/r/20200809050734.18740-1-stanley.chu@mediatek.com
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Co-developed-by: Andy Teng <andy.teng@mediatek.com>
Signed-off-by: Andy Teng <andy.teng@mediatek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux/debugobjects.h')
0 files changed, 0 insertions, 0 deletions