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| author | Gabriel Krisman Bertazi <krisman@collabora.com> | 2020-01-06 21:58:15 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-01-16 06:55:36 +0300 |
| commit | 7c1ef338705fb5c53e6f574ae5eb19fdfacb3d26 (patch) | |
| tree | 7f06aa8f71974f41bc720375382d1dfb77eb9ff6 /include/linux/attribute_container.h | |
| parent | 54155ed4199c7aa3fd20866648024ab63c96d579 (diff) | |
| download | linux-7c1ef338705fb5c53e6f574ae5eb19fdfacb3d26.tar.xz | |
scsi: drivers: base: Support atomic version of attribute_container_device_trigger
attribute_container_device_trigger invokes callbacks that may fail for one
or more classdevs, for instance, the transport_add_class_device callback,
called during transport creation, does memory allocation. This
information, though, is not propagated to upper layers, and any driver
using the attribute_container_device_trigger API will not know whether any,
some, or all callbacks succeeded.
This patch implements a safe version of this dispatcher, to either succeed
all the callbacks or revert to the original state.
Link: https://lore.kernel.org/r/20200106185817.640331-2-krisman@collabora.com
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include/linux/attribute_container.h')
| -rw-r--r-- | include/linux/attribute_container.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/attribute_container.h b/include/linux/attribute_container.h index d12bb2153cd6..e4004d1e6725 100644 --- a/include/linux/attribute_container.h +++ b/include/linux/attribute_container.h @@ -54,6 +54,13 @@ void attribute_container_device_trigger(struct device *dev, int (*fn)(struct attribute_container *, struct device *, struct device *)); +int attribute_container_device_trigger_safe(struct device *dev, + int (*fn)(struct attribute_container *, + struct device *, + struct device *), + int (*undo)(struct attribute_container *, + struct device *, + struct device *)); void attribute_container_trigger(struct device *dev, int (*fn)(struct attribute_container *, struct device *)); |