linux-kernel - [PATCH 1/2] bus: fsl-mc: don't assume an iommu is always present

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Message-Id: <20200914105459.27448-1-laurentiu.tudor@nxp.com>
Date:   Mon, 14 Sep 2020 13:54:58 +0300
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org
Cc:     diana.craciun@....com, ioana.ciornei@....com,
        anda-alexandra.dorneanu@....com,
        Laurentiu Tudor <laurentiu.tudor@....com>
Subject: [PATCH 1/2] bus: fsl-mc: don't assume an iommu is always present

There are certain scenarios where an iommu is not present, e.g.
booting in a VM. Let's support these scenarios by dropping the
check.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index b69794e7364d..b0449df117e8 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -908,9 +908,6 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
 	u32 mc_portal_size, mc_stream_id;
 	struct resource *plat_res;
 
-	if (!iommu_present(&fsl_mc_bus_type))
-		return -EPROBE_DEFER;
-
 	mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
 	if (!mc)
 		return -ENOMEM;
-- 
2.17.1