This is a note to let you know that I've just added the patch titled
scsi: ufs: Fix toggling of clk_gating.state when clock gating is not allowed
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-ufs-fix-toggling-of-clk_gating.state-when-clock.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0eb9778926430a8663ccd7169436f98b363a6bf2
Author: Avri Altman <avri.altman@xxxxxxx>
Date: Tue Jan 28 09:12:07 2025 +0200
scsi: ufs: Fix toggling of clk_gating.state when clock gating is not allowed
[ Upstream commit 839a74b5649c9f41d939a05059b5ca6b17156d03 ]
This commit addresses an issue where clk_gating.state is being toggled in
ufshcd_setup_clocks() even if clock gating is not allowed.
The fix is to add a check for hba->clk_gating.is_initialized before toggling
clk_gating.state in ufshcd_setup_clocks().
Since clk_gating.lock is now initialized unconditionally, it can no longer
lead to the spinlock being used before it is properly initialized, but
instead it is mostly for documentation purposes.
Fixes: 1ab27c9cf8b6 ("ufs: Add support for clock gating")
Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Tested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Avri Altman <avri.altman@xxxxxxx>
Link: https://lore.kernel.org/r/20250128071207.75494-3-avri.altman@xxxxxxx
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 5682fdcbf2da5..a73fffd6c3de4 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -9240,7 +9240,7 @@ static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on)
if (!IS_ERR_OR_NULL(clki->clk) && clki->enabled)
clk_disable_unprepare(clki->clk);
}
- } else if (!ret && on) {
+ } else if (!ret && on && hba->clk_gating.is_initialized) {
scoped_guard(spinlock_irqsave, &hba->clk_gating.lock)
hba->clk_gating.state = CLKS_ON;
trace_ufshcd_clk_gating(dev_name(hba->dev),
