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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Vivek Gautam <vivek.gautam@codeaurora.org>,
        Tomasz Figa <tfiga@chromium.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Subject: [PATCH 4.18 024/123] iommu/arm-smmu: Error out only if not enough context interrupts
Date:   Mon,  3 Sep 2018 18:56:08 +0200
Message-Id: <20180903165720.522579160@linuxfoundation.org>
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4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vivek Gautam <vivek.gautam@codeaurora.org>

commit d1e20222d5372e951bbb2fd3f6489ec4a6ea9b11 upstream.

Currently we check if the number of context banks is not equal to
num_context_interrupts. However, there are booloaders such as, one
on sdm845 that reserves few context banks and thus kernel views
less than the total available context banks.
So, although the hardware definition in device tree would mention
the correct number of context interrupts, this number can be
greater than the number of context banks visible to smmu in kernel.
We should therefore error out only when the number of context banks
is greater than the available number of context interrupts.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Suggested-by: Tomasz Figa <tfiga@chromium.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
[will: drop useless printk]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iommu/arm-smmu.c |   16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -2103,12 +2103,16 @@ static int arm_smmu_device_probe(struct
 	if (err)
 		return err;
 
-	if (smmu->version == ARM_SMMU_V2 &&
-	    smmu->num_context_banks != smmu->num_context_irqs) {
-		dev_err(dev,
-			"found only %d context interrupt(s) but %d required\n",
-			smmu->num_context_irqs, smmu->num_context_banks);
-		return -ENODEV;
+	if (smmu->version == ARM_SMMU_V2) {
+		if (smmu->num_context_banks > smmu->num_context_irqs) {
+			dev_err(dev,
+			      "found only %d context irq(s) but %d required\n",
+			      smmu->num_context_irqs, smmu->num_context_banks);
+			return -ENODEV;
+		}
+
+		/* Ignore superfluous interrupts */
+		smmu->num_context_irqs = smmu->num_context_banks;
 	}
 
 	for (i = 0; i < smmu->num_global_irqs; ++i) {