Patch "soc/tegra: pmc: Don't probe PMC if early initialisation fails" has been added to the 4.7-stable tree

Patch "soc/tegra: pmc: Don't probe PMC if early initialisation fails" has been added to the 4.7-stable tree

[gregkh]

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

    soc/tegra: pmc: Don't probe PMC if early initialisation fails

to the 4.7-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:
     soc-tegra-pmc-don-t-probe-pmc-if-early-initialisation-fails.patch
and it can be found in the queue-4.7 subdirectory.

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


>From a83f1fc3f33930d01e579b9d4de92a045297b402 Mon Sep 17 00:00:00 2001
From: Jon Hunter <jonathanh@nvidia.com>
Date: Tue, 28 Jun 2016 11:38:28 +0100
Subject: soc/tegra: pmc: Don't probe PMC if early initialisation fails

From: Jon Hunter <jonathanh@nvidia.com>

commit a83f1fc3f33930d01e579b9d4de92a045297b402 upstream.

Commit 0259f522e04f ('soc/tegra: pmc: Restore base address on probe
failure') fixes an issue where the PMC base address pointer is not
restored on probe failure. However, this fix creates another problem
where if early initialisation of the PMC driver fails and an initial
mapping for the PMC address space is not created, then when the PMC
device is probed, the PMC base address pointer will not be valid and
this will cause a crash when tegra_pmc_init() is called and attempts
to access a register.

Although the PMC address space is mapped a 2nd time during the probe
and so this could be fixed by populating the base address pointer
earlier during the probe, this adds more complexity to the code.
Moreover, the PMC probe also assumes the the soc data pointer is also
initialised when the device is probed and if not will also lead to a
crash when calling tegra_pmc_init_tsense_reset(). Given that if the
early initialisation does fail then something bad has happen, it seems
acceptable to allow the PMC device probe to fail as well. Therefore, if
the PMC base address pointer or soc data pointer are not valid when
probing the PMC device, WARN and return an error.

Fixes: 0259f522e04f ('soc/tegra: pmc: Restore base address on probe failure')
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/soc/tegra/pmc.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1205,6 +1205,14 @@ static int tegra_pmc_probe(struct platfo
 	struct resource *res;
 	int err;
 
+	/*
+	 * Early initialisation should have configured an initial
+	 * register mapping and setup the soc data pointer. If these
+	 * are not valid then something went badly wrong!
+	 */
+	if (WARN_ON(!pmc->base || !pmc->soc))
+		return -ENODEV;
+
 	err = tegra_pmc_parse_dt(pmc, pdev->dev.of_node);
 	if (err < 0)
 		return err;


Patches currently in stable-queue which might be from jonathanh@nvidia.com are

queue-4.7/soc-tegra-pmc-don-t-probe-pmc-if-early-initialisation-fails.patch