Patch "coresight: etm4x: Do not hardcode IOMEM access for register restore" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    coresight: etm4x: Do not hardcode IOMEM access for register restore

to the 6.6-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-do-not-hardcode-iomem-access-for-reg.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 59860d678e1c04295013eec8d29a0ccc2d6d3632
Author: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Date:   Fri Apr 12 15:26:59 2024 +0100

    coresight: etm4x: Do not hardcode IOMEM access for register restore
    
    [ Upstream commit 1e7ba33fa591de1cf60afffcabb45600b3607025 ]
    
    When we restore the register state for ETM4x, while coming back
    from CPU idle, we hardcode IOMEM access. This is wrong and could
    blow up for an ETM with system instructions access (and for ETE).
    
    Fixes: f5bd523690d2 ("coresight: etm4x: Convert all register accesses")
    Reported-by: Yabin Cui <yabinc@xxxxxxxxxx>
    Reviewed-by: Mike Leach <mike.leach@xxxxxxxxxx>
    Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
    Tested-by: Yabin Cui <yabinc@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240412142702.2882478-2-suzuki.poulose@xxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index 003245a791a23..ad866e29020e3 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -1805,8 +1805,10 @@ static void __etm4_cpu_restore(struct etmv4_drvdata *drvdata)
 {
 	int i;
 	struct etmv4_save_state *state = drvdata->save_state;
-	struct csdev_access tmp_csa = CSDEV_ACCESS_IOMEM(drvdata->base);
-	struct csdev_access *csa = &tmp_csa;
+	struct csdev_access *csa = &drvdata->csdev->access;
+
+	if (WARN_ON(!drvdata->csdev))
+		return;
 
 	etm4_cs_unlock(drvdata, csa);
 	etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET);




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