linux-kernel - [PATCH v2 4/6] vfio: platform: add compat in vfio_platform

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Message-Id: <1445506922-6005-5-git-send-email-eric.auger@linaro.org>
Date:	Thu, 22 Oct 2015 11:42:00 +0200
From:	Eric Auger <eric.auger@...aro.org>
To:	eric.auger@...com, eric.auger@...aro.org,
	alex.williamson@...hat.com, b.reynal@...tualopensystems.com,
	arnd@...db.de, linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org
Cc:	christoffer.dall@...aro.org, linux-kernel@...r.kernel.org,
	patches@...aro.org
Subject: [PATCH v2 4/6] vfio: platform: add compat in vfio_platform_device

Let's retrieve the compatibility string on probe and store it
in the vfio_platform_device struct

Signed-off-by: Eric Auger <eric.auger@...aro.org>
---
 drivers/vfio/platform/vfio_platform_common.c  | 15 ++++++++-------
 drivers/vfio/platform/vfio_platform_private.h |  1 +
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index 52a4c7b..e7d615f 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -45,16 +45,11 @@ static const struct vfio_platform_reset_combo reset_lookup_table[] = {
 static void vfio_platform_get_reset(struct vfio_platform_device *vdev,
 				    struct device *dev)
 {
-	const char *compat;
 	int (*reset)(struct vfio_platform_device *);
-	int ret, i;
-
-	ret = device_property_read_string(dev, "compatible", &compat);
-	if (ret)
-		return;
+	int i;
 
 	for (i = 0 ; i < ARRAY_SIZE(reset_lookup_table); i++) {
-		if (!strcmp(reset_lookup_table[i].compat, compat)) {
+		if (!strcmp(reset_lookup_table[i].compat, vdev->compat)) {
 			request_module(reset_lookup_table[i].module_name);
 			reset = __symbol_get(
 				reset_lookup_table[i].reset_function_name);
@@ -545,6 +540,12 @@ int vfio_platform_probe_common(struct vfio_platform_device *vdev,
 	struct iommu_group *group;
 	int ret;
 
+	ret = device_property_read_string(dev, "compatible", &vdev->compat);
+	if (ret) {
+		pr_err("VFIO: cannot retrieve compat for %s\n", vdev->name);
+		return -EINVAL;
+	}
+
 	if (!vdev)
 		return -EINVAL;
 
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index 1fb1410..620ee40 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -56,6 +56,7 @@ struct vfio_platform_device {
 	u32				num_irqs;
 	int				refcnt;
 	struct mutex			igate;
+	const char			*compat;
 
 	/*
 	 * These fields should be filled by the bus specific binder
-- 
1.9.1

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