diff mbox series

[v4,02/14] vfio/mbochs: Fix missing error unwind of mbochs_used_mbytes

Message ID 2-v4-9ea22c5e6afb+1adf-vfio_reflck_jgg@nvidia.com (mailing list archive)
State New, archived
Headers show
Series Provide core infrastructure for managing open/release | expand

Commit Message

Jason Gunthorpe Aug. 6, 2021, 1:18 a.m. UTC 
Convert mbochs to use an atomic scheme for this like mtty was changed
into. The atomic fixes various race conditions with probing. Add the
missing error unwind. Also add the missing kfree of mdev_state->pages.

Fixes: 681c1615f891 ("vfio/mbochs: Convert to use vfio_register_group_dev()")
Reported-by: Cornelia Huck <cohuck@redhat.com>
Co-developed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 samples/vfio-mdev/mbochs.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

Comments

Cornelia Huck Aug. 11, 2021, 9:17 a.m. UTC | #1 
On Thu, Aug 05 2021, Jason Gunthorpe <jgg@nvidia.com> wrote:

> Convert mbochs to use an atomic scheme for this like mtty was changed
> into. The atomic fixes various race conditions with probing. Add the
> missing error unwind. Also add the missing kfree of mdev_state->pages.
>
> Fixes: 681c1615f891 ("vfio/mbochs: Convert to use vfio_register_group_dev()")
> Reported-by: Cornelia Huck <cohuck@redhat.com>
> Co-developed-by: Alex Williamson <alex.williamson@redhat.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>  samples/vfio-mdev/mbochs.c | 24 +++++++++++++++---------
>  1 file changed, 15 insertions(+), 9 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
diff mbox series

Patch

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index e81b875b4d87b4..3e885be7d076ad 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -129,7 +129,7 @@  static dev_t		mbochs_devt;
 static struct class	*mbochs_class;
 static struct cdev	mbochs_cdev;
 static struct device	mbochs_dev;
-static int		mbochs_used_mbytes;
+static atomic_t mbochs_avail_mbytes;
 static const struct vfio_device_ops mbochs_dev_ops;
 
 struct vfio_region_info_ext {
@@ -507,18 +507,22 @@  static int mbochs_reset(struct mdev_state *mdev_state)
 
 static int mbochs_probe(struct mdev_device *mdev)
 {
+	int avail_mbytes = atomic_read(&mbochs_avail_mbytes);
 	const struct mbochs_type *type =
 		&mbochs_types[mdev_get_type_group_id(mdev)];
 	struct device *dev = mdev_dev(mdev);
 	struct mdev_state *mdev_state;
 	int ret = -ENOMEM;
 
-	if (type->mbytes + mbochs_used_mbytes > max_mbytes)
-		return -ENOMEM;
+	do {
+		if (avail_mbytes < type->mbytes)
+			return -ENOSPC;
+	} while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes,
+				     avail_mbytes - type->mbytes));
 
 	mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
 	if (mdev_state == NULL)
-		return -ENOMEM;
+		goto err_avail;
 	vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mbochs_dev_ops);
 
 	mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
@@ -549,17 +553,17 @@  static int mbochs_probe(struct mdev_device *mdev)
 	mbochs_create_config_space(mdev_state);
 	mbochs_reset(mdev_state);
 
-	mbochs_used_mbytes += type->mbytes;
-
 	ret = vfio_register_group_dev(&mdev_state->vdev);
 	if (ret)
 		goto err_mem;
 	dev_set_drvdata(&mdev->dev, mdev_state);
 	return 0;
-
 err_mem:
+	kfree(mdev_state->pages);
 	kfree(mdev_state->vconfig);
 	kfree(mdev_state);
+err_avail:
+	atomic_add(type->mbytes, &mbochs_avail_mbytes);
 	return ret;
 }
 
@@ -567,8 +571,8 @@  static void mbochs_remove(struct mdev_device *mdev)
 {
 	struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
 
-	mbochs_used_mbytes -= mdev_state->type->mbytes;
 	vfio_unregister_group_dev(&mdev_state->vdev);
+	atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes);
 	kfree(mdev_state->pages);
 	kfree(mdev_state->vconfig);
 	kfree(mdev_state);
@@ -1351,7 +1355,7 @@  static ssize_t available_instances_show(struct mdev_type *mtype,
 {
 	const struct mbochs_type *type =
 		&mbochs_types[mtype_get_type_group_id(mtype)];
-	int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
+	int count = atomic_read(&mbochs_avail_mbytes) / type->mbytes;
 
 	return sprintf(buf, "%d\n", count);
 }
@@ -1433,6 +1437,8 @@  static int __init mbochs_dev_init(void)
 {
 	int ret = 0;
 
+	atomic_set(&mbochs_avail_mbytes, max_mbytes);
+
 	ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
 	if (ret < 0) {
 		pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);