linux-kernel - Re: [PATCH v4 1/2] devcoredump: Add dev_coredump

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Date: Tue, 9 Apr 2024 18:23:33 -0400
From: Rodrigo Vivi <rodrigo.vivi@...el.com>
To: José Roberto de Souza <jose.souza@...el.com>,
	<gregkh@...uxfoundation.org>
CC: <linux-kernel@...r.kernel.org>, <intel-xe@...ts.freedesktop.org>, "Mukesh
 Ojha" <quic_mojha@...cinc.com>, Johannes Berg <johannes@...solutions.net>,
	Jonathan Cavitt <jonathan.cavitt@...el.com>
Subject: Re: [PATCH v4 1/2] devcoredump: Add dev_coredump_put()

On Tue, Apr 09, 2024 at 01:02:05PM -0700, José Roberto de Souza wrote:
> 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@...el.com>
> Cc: Mukesh Ojha <quic_mojha@...cinc.com>
> Cc: Johannes Berg <johannes@...solutions.net>
> Cc: Jonathan Cavitt <jonathan.cavitt@...el.com>
> Reviewed-by: Johannes Berg <johannes@...solutions.net>
> Acked-by: Jonathan Cavitt <jonathan.cavitt@...el.com>
> Signed-off-by: José Roberto de Souza <jose.souza@...el.com>

Greg, can I have you ack to merge this through the drm-next?

> ---
>  drivers/base/devcoredump.c  | 23 +++++++++++++++++++++++
>  include/linux/devcoredump.h |  5 +++++
>  2 files changed, 28 insertions(+)
> 
> diff --git a/drivers/base/devcoredump.c b/drivers/base/devcoredump.c
> index 7e2d1f0d903a6..82aeb09b3d1b5 100644
> --- a/drivers/base/devcoredump.c
> +++ b/drivers/base/devcoredump.c
> @@ -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
> diff --git a/include/linux/devcoredump.h b/include/linux/devcoredump.h
> index c008169ed2c6f..c8f7eb6cc1915 100644
> --- a/include/linux/devcoredump.h
> +++ b/include/linux/devcoredump.h
> @@ -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 */
> -- 
> 2.44.0
>