linux-kernel - Re: [PATCH] hwmon (occ): Fix response length in checksum retry

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Date:   Wed, 20 Jul 2022 20:46:01 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        jdelvare@...e.com
Subject: Re: [PATCH] hwmon (occ): Fix response length in checksum retry

On Wed, Jul 20, 2022 at 02:30:36PM -0500, Eddie James wrote:
> Retrying for checksum failure doesn't work since the response length
> gets zeroed out in the submit function. Fix this by resetting the
> response length to its original value before the retry.
> 
> Fixes: c27b98ca0edb ("hwmon (occ): Retry for checksum failure")
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>

Acked-by: Guenter Roeck <linux@...ck-us.net>

I assume this patch will be applied with the patch introducing the problem.
If not, I'll apply it after the next commit window closes.

Thanks,
Guenter

> ---
>  drivers/hwmon/occ/p9_sbe.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c
> index 4a1fe4ee8e2c..f3791a589b01 100644
> --- a/drivers/hwmon/occ/p9_sbe.c
> +++ b/drivers/hwmon/occ/p9_sbe.c
> @@ -82,6 +82,7 @@ static bool p9_sbe_occ_save_ffdc(struct p9_sbe_occ *ctx, const void *resp,
>  static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len,
>  			       void *resp, size_t resp_len)
>  {
> +	size_t original_resp_len = resp_len;
>  	struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
>  	int rc, i;
>  
> @@ -97,6 +98,7 @@ static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len,
>  		}
>  		if (rc != -EBADE)
>  			return rc;
> +		resp_len = original_resp_len;
>  	}
>  
>  	switch (((struct occ_response *)resp)->return_status) {