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vfio-ccw: introduce vfio_ccw_get_device() 

A recent patch fixed leaks of the dynamically allocated vcdev->vdev.name
field in vfio_ccw_realize(), but we now have three freeing sites for it.
This is unfortunate and seems to indicate something is wrong with its
life cycle.

The root issue is that vcdev->vdev.name is set before vfio_get_device()
is called, which theoretically prevents to call vfio_put_device() to
do the freeing. Well actually, we could call it anyway  because
vfio_put_base_device() is a nop if the device isn't attached, but this
would be confusing.

This patch hence moves all the logic of attaching the device, including
the "already attached" check, to a separate vfio_ccw_get_device() function,
counterpart of vfio_put_device(). While here, vfio_put_device() is renamed
to vfio_ccw_put_device() for consistency.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <152326891065.266543.9487977590811413472.stgit@bahia.lan>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Greg Kurz 2018-04-09 12:15:10 +02:00 committed by Cornelia Huck
parent 98e43b71b2
commit c96f2c2a16
1 changed files with 36 additions and 20 deletions
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56
hw/vfio/ccw.c
View File

@ -292,12 +292,43 @@ static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
g_free(vcdev->io_region);
}
static void vfio_put_device(VFIOCCWDevice *vcdev)
static void vfio_ccw_put_device(VFIOCCWDevice *vcdev)
{
g_free(vcdev->vdev.name);
vfio_put_base_device(&vcdev->vdev);
}
static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
Error **errp)
{
char *name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
vcdev->cdev.hostid.ssid,
vcdev->cdev.hostid.devid);
VFIODevice *vbasedev;
QLIST_FOREACH(vbasedev, &group->device_list, next) {
if (strcmp(vbasedev->name, name) == 0) {
error_setg(errp, "vfio: subchannel %s has already been attached",
name);
goto out_err;
}
}
if (vfio_get_device(group, vcdev->cdev.mdevid, &vcdev->vdev, errp)) {
goto out_err;
}
vcdev->vdev.ops = &vfio_ccw_ops;
vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
vcdev->vdev.name = name;
vcdev->vdev.dev = &vcdev->cdev.parent_obj.parent_obj;
return;
out_err:
g_free(name);
}
static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
{
char *tmp, group_path[PATH_MAX];
@ -327,7 +358,6 @@ static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
static void vfio_ccw_realize(DeviceState *dev, Error **errp)
{
VFIODevice *vbasedev;
VFIOGroup *group;
CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
@ -348,22 +378,8 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
goto out_group_err;
}
vcdev->vdev.ops = &vfio_ccw_ops;
vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
vcdev->vdev.name = g_strdup_printf("%x.%x.%04x", cdev->hostid.cssid,
cdev->hostid.ssid, cdev->hostid.devid);
vcdev->vdev.dev = dev;
QLIST_FOREACH(vbasedev, &group->device_list, next) {
if (strcmp(vbasedev->name, vcdev->vdev.name) == 0) {
error_setg(&err, "vfio: subchannel %s has already been attached",
vcdev->vdev.name);
g_free(vcdev->vdev.name);
goto out_device_err;
}
}
if (vfio_get_device(group, cdev->mdevid, &vcdev->vdev, &err)) {
g_free(vcdev->vdev.name);
vfio_ccw_get_device(group, vcdev, &err);
if (err) {
goto out_device_err;
}
@ -382,7 +398,7 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
out_notifier_err:
vfio_ccw_put_region(vcdev);
out_region_err:
vfio_put_device(vcdev);
vfio_ccw_put_device(vcdev);
out_device_err:
vfio_put_group(group);
out_group_err:
@ -403,7 +419,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
vfio_ccw_unregister_io_notifier(vcdev);
vfio_ccw_put_region(vcdev);
vfio_put_device(vcdev);
vfio_ccw_put_device(vcdev);
vfio_put_group(group);
if (cdc->unrealize) {