This is a note to let you know that I've just added the patch titled
coresight: etm4x: Fix issues on trcseqevr access
to the 5.9-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:
coresight-etm4x-fix-issues-on-trcseqevr-access.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a47c98717077ed9021970221998f41c7df0c1ce9
Author: Jonathan Zhou <jonathan.zhouwen@xxxxxxxxxx>
Date: Wed Sep 16 13:17:32 2020 -0600
coresight: etm4x: Fix issues on trcseqevr access
[ Upstream commit 4cd83037cd957ad97756055355ab4ee63f259380 ]
The TRCSEQEVR(3) is reserved, using '@nrseqstate - 1' instead to avoid
accessing the reserved register.
Fixes: f188b5e76aae ("coresight: etm4x: Save/restore state across CPU low power states")
Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Cc: Mike Leach <mike.leach@xxxxxxxxxx>
Cc: Shaokun Zhang <zhangshaokun@xxxxxxxxxxxxx>
Signed-off-by: Jonathan Zhou <jonathan.zhouwen@xxxxxxxxxx>
[Fixed capital letter in title]
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200916191737.4001561-12-mathieu.poirier@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 2bcc8d4a82c8e..944c7a7cc1d91 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1193,7 +1193,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
state->trcvdsacctlr = readl(drvdata->base + TRCVDSACCTLR);
state->trcvdarcctlr = readl(drvdata->base + TRCVDARCCTLR);
- for (i = 0; i < drvdata->nrseqstate; i++)
+ for (i = 0; i < drvdata->nrseqstate - 1; i++)
state->trcseqevr[i] = readl(drvdata->base + TRCSEQEVRn(i));
state->trcseqrstevr = readl(drvdata->base + TRCSEQRSTEVR);
@@ -1298,7 +1298,7 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
writel_relaxed(state->trcvdsacctlr, drvdata->base + TRCVDSACCTLR);
writel_relaxed(state->trcvdarcctlr, drvdata->base + TRCVDARCCTLR);
- for (i = 0; i < drvdata->nrseqstate; i++)
+ for (i = 0; i < drvdata->nrseqstate - 1; i++)
writel_relaxed(state->trcseqevr[i],
drvdata->base + TRCSEQEVRn(i));
