linux-kernel - [RFC PATCH] xen/gntdev: Stop abusing DT of_dma

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Message-Id: <20190925215006.12056-1-robh@kernel.org>
Date:   Wed, 25 Sep 2019 16:50:06 -0500
From:   Rob Herring <robh@...nel.org>
To:     Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     linux-kernel@...r.kernel.org, Robin Murphy <robin.murphy@....com>,
        Julien Grall <julien.grall@....com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org
Subject: [RFC PATCH] xen/gntdev: Stop abusing DT of_dma_configure API

As the comment says, this isn't a DT based device. of_dma_configure()
is going to stop allowing a NULL DT node, so this needs to be fixed.

Not sure exactly what setup besides arch_setup_dma_ops is needed...

Cc: Robin Murphy <robin.murphy@....com>
Cc: Julien Grall <julien.grall@....com>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Stefano Stabellini <sstabellini@...nel.org>
Cc: xen-devel@...ts.xenproject.org
Signed-off-by: Rob Herring <robh@...nel.org>
---
 drivers/xen/gntdev.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index a446a7221e13..59906f9a40e4 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -34,9 +34,6 @@
 #include <linux/slab.h>
 #include <linux/highmem.h>
 #include <linux/refcount.h>
-#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
-#include <linux/of_device.h>
-#endif
 
 #include <xen/xen.h>
 #include <xen/grant_table.h>
@@ -625,14 +622,6 @@ static int gntdev_open(struct inode *inode, struct file *flip)
 	flip->private_data = priv;
 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
 	priv->dma_dev = gntdev_miscdev.this_device;
-
-	/*
-	 * The device is not spawn from a device tree, so arch_setup_dma_ops
-	 * is not called, thus leaving the device with dummy DMA ops.
-	 * Fix this by calling of_dma_configure() with a NULL node to set
-	 * default DMA ops.
-	 */
-	of_dma_configure(priv->dma_dev, NULL, true);
 #endif
 	pr_debug("priv %p\n", priv);
 
-- 
2.20.1