linux-kernel - Re: [PATCH net-next 1/5] net: ipa: head-of-line block registers are RX only

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Date:   Mon, 29 Jun 2020 17:35:17 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Alex Elder <elder@...aro.org>
Cc:     davem@...emloft.net, evgreen@...omium.org, subashab@...eaurora.org,
        cpratapa@...eaurora.org, bjorn.andersson@...aro.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/5] net: ipa: head-of-line block registers are
 RX only

On Mon, 29 Jun 2020 16:49:15 -0500 Alex Elder wrote:
> The INIT_HOL_BLOCK_EN and INIT_HOL_BLOCK_TIMER endpoint registers
> are only valid for RX endpoints.
> 
> Have ipa_endpoint_modem_hol_block_clear_all() skip writing these
> registers for TX endpoints.
> 
> Signed-off-by: Alex Elder <elder@...aro.org>
> ---
>  drivers/net/ipa/ipa_endpoint.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
> index 9f50d0d11704..3f5a41fc1997 100644
> --- a/drivers/net/ipa/ipa_endpoint.c
> +++ b/drivers/net/ipa/ipa_endpoint.c
> @@ -642,6 +642,8 @@ static int ipa_endpoint_init_hol_block_timer(struct ipa_endpoint *endpoint,
>  	u32 offset;
>  	u32 val;
>  
> +	/* assert(!endpoint->toward_ipa); */
> +
>  	/* XXX We'll fix this when the register definition is clear */
>  	if (microseconds) {
>  		struct device *dev = &ipa->pdev->dev;
> @@ -671,6 +673,8 @@ ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
>  	u32 offset;
>  	u32 val;
>  
> +	/* assert(!endpoint->toward_ipa); */

What are these assert comments for? :S