linux-kernel - Re: [PATCH] habanalabs: improve error messages

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Date:   Fri, 29 Mar 2019 17:29:55 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] habanalabs: improve error messages

On Thu, Mar 28, 2019 at 09:13:13AM +0200, Oded Gabbay wrote:
> This patch improves two error messages to help the user to
> better understand what error occurred.
> 
> Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
> ---
>  drivers/misc/habanalabs/command_submission.c | 3 ++-
>  drivers/misc/habanalabs/memory.c             | 2 +-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/misc/habanalabs/command_submission.c b/drivers/misc/habanalabs/command_submission.c
> index f908643f871f..02c48da0b645 100644
> --- a/drivers/misc/habanalabs/command_submission.c
> +++ b/drivers/misc/habanalabs/command_submission.c
> @@ -261,7 +261,8 @@ static void cs_timedout(struct work_struct *work)
>  	ctx_asid = cs->ctx->asid;
>  
>  	/* TODO: add information about last signaled seq and last emitted seq */
> -	dev_err(hdev->dev, "CS %d.%llu got stuck!\n", ctx_asid, cs->sequence);
> +	dev_err(hdev->dev, "User %d command submission %llu got stuck!\n",
> +		ctx_asid, cs->sequence);
>  
>  	cs_put(cs);
>  
> diff --git a/drivers/misc/habanalabs/memory.c b/drivers/misc/habanalabs/memory.c
> index ce1fda40a8b8..39788b1cf8d0 100644
> --- a/drivers/misc/habanalabs/memory.c
> +++ b/drivers/misc/habanalabs/memory.c
> @@ -109,7 +109,7 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
>  							page_size);
>  			if (!phys_pg_pack->pages[i]) {
>  				dev_err(hdev->dev,
> -					"ioctl failed to allocate page\n");
> +					"Failed to allocate device memory (out of memory)\n");

No need for a message at all here, right?  The core should have already
told you you had a problem.

greg k-h