linux-kernel - Re: [PATCH] switchtec: Remove immediate status check after submit a MRPC command

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Message-ID: <fc563e88-7ab0-822a-9238-859cf8c08fbe@deltatee.com>
Date:   Thu, 13 Sep 2018 10:00:00 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Wesley.Sheng@...rochip.com, kurt.schwemmer@...rosemi.com,
        Kurt.Schwemmer@...rochip.com, bhelgaas@...gle.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] switchtec: Remove immediate status check after submit a
 MRPC command



On 13/09/18 12:43 AM, Wesley.Sheng@...rochip.com wrote:
> From: Wesley Sheng <Wesley.Sheng@...rochip.com>

You've done something wrong here. The sign-off line below says its
signed off by Kelvin, who was the original author (on the github repo)
but the From: line indicates you were the author. Also, please start
using 'git send-email' as your patches are being mangled by your email
client.

> To avoid this, the immediate check of status is removed
> in this patch, and driver delays the status check to the
> occurrence of MSIx or MRPC timeout. In the meanwhile, user
> must not initiate any gas access during a firmware download.

s/meanwhile/meantime/

> Note: For NTB function, the memory window access is handled
> by switchtec hardware. So it's not affected by this firmware
> limitation. But the GAS accesses, like for doorbell registers,
> in the NTB function are affected by this firmware limitation.
> 
> Signed-off-by: Kelvin Cao <Kelvin.Cao@...rochip.com>

We also need a Signed-off-by from you. Anyone who handled the patch
needs to sign off on it.

At least for the contents of the changes, modulo the above fixes:

Reviewed-by: Logan Gunthorpe <logang@...tatee.com>

> ---
>  drivers/pci/switch/switchtec.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
> index 4591f15..b759228 100644
> --- a/drivers/pci/switch/switchtec.c
> +++ b/drivers/pci/switch/switchtec.c
> @@ -142,10 +142,6 @@ static void mrpc_cmd_submit(struct switchtec_dev *stdev)
>  		    stuser->data, stuser->data_len);
>  	iowrite32(stuser->cmd, &stdev->mmio_mrpc->cmd);
>  
> -	stuser->status = ioread32(&stdev->mmio_mrpc->status);
> -	if (stuser->status != SWITCHTEC_MRPC_STATUS_INPROGRESS)
> -		mrpc_complete_cmd(stdev);
> -
>  	schedule_delayed_work(&stdev->mrpc_timeout,
>  			      msecs_to_jiffies(500));
>  }
>