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vfio/ap/ccw/samples: Fix device_register() unwind path

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We always need to call put_device() if device_register() fails.
All vfio drivers calling device_register() include a similar unwind
stack via gotos, therefore split device_unregister() into its
device_del() and put_device() components in the unwind path, and
add a goto target to handle only the put_device() requirement.

Reported-by: Ruan Jinjie <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/all/20221118032827.3725190-1-ruanjinjie@huawei.com
Fixes: d61fc96f47 ("sample: vfio mdev display - host device")
Fixes: 9d1a546c53 ("docs: Sample driver to demonstrate how to use Mediated device framework.")
Fixes: a5e6e6505f ("sample: vfio bochs vbe display (host device for bochs-drm)")
Fixes: 9e6f07cd1e ("vfio/ccw: create a parent struct")
Fixes: 36360658eb ("s390: vfio_ap: link the vfio_ap devices to the vfio_ap bus subsystem")
Cc: Tony Krowiak <akrowiak@linux.ibm.com>
Cc: Halil Pasic <pasic@linux.ibm.com>
Cc: Jason Herne <jjherne@linux.ibm.com>
Cc: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Link: https://lore.kernel.org/r/166999942139.645727.12439756512449846442.stgit@omen
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson
2022-12-02 09:46:15 -07:00
parent e2d5570939
commit ce3895735c
5 changed files with 15 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
samples/vfio-mdev/mbochs.c
View File

@@ -1430,7 +1430,7 @@ static int __init mbochs_dev_init(void)
ret = device_register(&mbochs_dev);
if (ret)
goto err_class;
goto err_put;
ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver,
mbochs_mdev_types,
@@ -1441,8 +1441,9 @@ static int __init mbochs_dev_init(void)
return 0;
err_device:
device_unregister(&mbochs_dev);
err_class:
device_del(&mbochs_dev);
err_put:
put_device(&mbochs_dev);
class_destroy(mbochs_class);
err_driver:
mdev_unregister_driver(&mbochs_driver);

7
samples/vfio-mdev/mdpy.c
View File

@@ -717,7 +717,7 @@ static int __init mdpy_dev_init(void)
ret = device_register(&mdpy_dev);
if (ret)
goto err_class;
goto err_put;
ret = mdev_register_parent(&mdpy_parent, &mdpy_dev, &mdpy_driver,
mdpy_mdev_types,
@@ -728,8 +728,9 @@ static int __init mdpy_dev_init(void)
return 0;
err_device:
device_unregister(&mdpy_dev);
err_class:
device_del(&mdpy_dev);
err_put:
put_device(&mdpy_dev);
class_destroy(mdpy_class);
err_driver:
mdev_unregister_driver(&mdpy_driver);

7
samples/vfio-mdev/mtty.c
View File

@@ -1330,7 +1330,7 @@ static int __init mtty_dev_init(void)
ret = device_register(&mtty_dev.dev);
if (ret)
goto err_class;
goto err_put;
ret = mdev_register_parent(&mtty_dev.parent, &mtty_dev.dev,
&mtty_driver, mtty_mdev_types,
@@ -1340,8 +1340,9 @@ static int __init mtty_dev_init(void)
return 0;
err_device:
device_unregister(&mtty_dev.dev);
err_class:
device_del(&mtty_dev.dev);
err_put:
put_device(&mtty_dev.dev);
class_destroy(mtty_dev.vd_class);
err_driver:
mdev_unregister_driver(&mtty_driver);