linux-kernel - Re: [PATCH 2/3] remoteproc: pru: Fix wrong success return value for fw events

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Date:   Tue, 6 Apr 2021 17:33:10 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suman Anna <s-anna@...com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Lokesh Vutla <lokeshvutla@...com>,
        linux-remoteproc@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] remoteproc: pru: Fix wrong success return value for
 fw events

On Tue, Mar 23, 2021 at 05:38:38PM -0500, Suman Anna wrote:
> The irq_create_fwspec_mapping() returns a proper virq value on success
> and 0 upon any failure. The pru_handle_intrmap() treats this as an error
> and disposes all firmware event mappings correctly, but is returning
> this incorrect value as is, letting the pru_rproc_start() interpret it
> as a success and boot the PRU.
> 

Very subtle...  I had to look twice to make sure.

Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>

> Fix this by returning an error value back upon any such failure. While
> at this, revise the error trace to print some meaningful info about the
> failed event.
> 
> Fixes: c75c9fdac66e ("remoteproc: pru: Add support for PRU specific interrupt configuration")
> Signed-off-by: Suman Anna <s-anna@...com>
> ---
>  drivers/remoteproc/pru_rproc.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
> index a9d07c0751be..87b43976c51b 100644
> --- a/drivers/remoteproc/pru_rproc.c
> +++ b/drivers/remoteproc/pru_rproc.c
> @@ -339,8 +339,10 @@ static int pru_handle_intrmap(struct rproc *rproc)
>  
>  		pru->mapped_irq[i] = irq_create_fwspec_mapping(&fwspec);
>  		if (!pru->mapped_irq[i]) {
> -			dev_err(dev, "failed to get virq\n");
> -			ret = pru->mapped_irq[i];
> +			dev_err(dev, "failed to get virq for fw mapping %d: event %d chnl %d host %d\n",
> +				i, fwspec.param[0], fwspec.param[1],
> +				fwspec.param[2]);
> +			ret = -EINVAL;
>  			goto map_fail;
>  		}
>  	}
> -- 
> 2.30.1
>