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));