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devcoredump: Add dev_coredump_put()

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It is useful for modules that do not want to keep coredump available
after its unload.
Otherwise, the coredump would only be removed after DEVCD_TIMEOUT
seconds.

v2:
- dev_coredump_put() documentation updated (Mukesh)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Mukesh Ojha <quic_mojha@quicinc.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240409200206.108452-1-jose.souza@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
José Roberto de Souza 2024-04-09 13:02:05 -07:00 committed by Rodrigo Vivi
parent ac321eb46e
commit a28380f119
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2 changed files with 28 additions and 0 deletions
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23
drivers/base/devcoredump.c
View File

@ -304,6 +304,29 @@ static ssize_t devcd_read_from_sgtable(char *buffer, loff_t offset,
offset);
}
/**
* dev_coredump_put - remove device coredump
* @dev: the struct device for the crashed device
*
* dev_coredump_put() removes coredump, if exists, for a given device from
* the file system and free its associated data otherwise, does nothing.
*
* It is useful for modules that do not want to keep coredump
* available after its unload.
*/
void dev_coredump_put(struct device *dev)
{
struct device *existing;
existing = class_find_device(&devcd_class, NULL, dev,
devcd_match_failing);
if (existing) {
devcd_free(existing, NULL);
put_device(existing);
}
}
EXPORT_SYMBOL_GPL(dev_coredump_put);
/**
* dev_coredumpm - create device coredump with read/free methods
* @dev: the struct device for the crashed device

5
include/linux/devcoredump.h
View File

@ -63,6 +63,8 @@ void dev_coredumpm(struct device *dev, struct module *owner,
void dev_coredumpsg(struct device *dev, struct scatterlist *table,
size_t datalen, gfp_t gfp);
void dev_coredump_put(struct device *dev);
#else
static inline void dev_coredumpv(struct device *dev, void *data,
size_t datalen, gfp_t gfp)
@ -85,6 +87,9 @@ static inline void dev_coredumpsg(struct device *dev, struct scatterlist *table,
{
_devcd_free_sgtable(table);
}
static inline void dev_coredump_put(struct device *dev)
{
}
#endif /* CONFIG_DEV_COREDUMP */
#endif /* __DEVCOREDUMP_H */