linux-kernel - Re: [PATCH] remoteproc: Reset table_ptr in rproc

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Message-ID: <20180731041559.GC5090@builder>
Date:   Mon, 30 Jul 2018 21:15:59 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Suman Anna <s-anna@...com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Loic Pallardy <loic.pallardy@...com>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remoteproc: Reset table_ptr in rproc_start() failure
 paths

On Thu 26 Jul 18:15 PDT 2018, Suman Anna wrote:

> Unwind the modified table_ptr and restore it to the local copy
> upon any subsequent failures in the rproc_start() function. This
> keeps the function to remain balanced on failures without the need
> to balance any modified variables elsewhere.
> 

Good catch.

> While at this, do some minor cleanup of the extra lines between
> the failure labels as well.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> ---
>  drivers/remoteproc/remoteproc_core.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index eadff6ce2f7f..afef2d491c5b 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -953,7 +953,7 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
>  	if (ret) {
>  		dev_err(dev, "failed to prepare subdevices for %s: %d\n",
>  			rproc->name, ret);
> -		return ret;
> +		goto reset_table_ptr;
>  	}
>  
>  	/* power up the remote processor */
> @@ -979,10 +979,11 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
>  
>  stop_rproc:
>  	rproc->ops->stop(rproc);
> -
>  unprepare_subdevices:
>  	rproc_unprepare_subdevices(rproc);
> -
> +reset_table_ptr:
> +	if (loaded_table)

Regardless of us having a loaded_table it should have the same value as
cached_table when we return - which might be NULL if we don't have a
resource table.

So I applied this without the conditional, please object if I missed
something.

Regards,
Bjorn

> +		rproc->table_ptr = rproc->cached_table;
>  	return ret;
>  }
>  
> -- 
> 2.18.0
>