xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

scsi: drivers: base: Support atomic version of attribute_container_device_trigger

Browse Source 
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>
This commit is contained in:
Gabriel Krisman Bertazi
2020-01-06 13:58:15 -05:00
committed by Martin K. Petersen
parent 54155ed419
commit 7c1ef33870
2 changed files with 110 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/attribute_container.h
View File

@@ -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 *));