linux-kernel - Re: [PATCH v2 1/1] cxl/feature: Update out

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Message-ID: <6bfb9815-0270-41e5-95c3-7ecefe8d46f4@zohomail.com>
Date: Thu, 10 Apr 2025 09:02:04 +0800
From: Li Ming <ming.li@...omail.com>
To: Dave Jiang <dave.jiang@...el.com>
Cc: linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
 dave@...olabs.net, jonathan.cameron@...wei.com, alison.schofield@...el.com,
 vishal.l.verma@...el.com, ira.weiny@...el.com, dan.j.williams@...el.com
Subject: Re: [PATCH v2 1/1] cxl/feature: Update out_len in set feature failure
 case

On 4/9/2025 11:37 PM, Dave Jiang wrote:
>
> On 4/8/25 7:25 PM, Li Ming wrote:
>> CXL subsystem supports userspace to configure features via fwctl
>> interface, it will configure features by using Set Feature command.
>> Whatever Set Feature succeeds or fails, CXL driver always needs to
>> return a structure fwctl_rpc_cxl_out to caller, and returned size is
>> updated in a out_len parameter. The out_len should be updated not only
>> when the set feature succeeds, but also when the set feature fails.
> Good catch! Can you add a Fixes tag please? Otherwise 
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>、

Yes, forgot to add a Fixes tag. Thanks for that.


Ming

>
>> Signed-off-by: Li Ming <ming.li@...omail.com>
>> ---
>> base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8 v6.15-rc1
>>
>> v2:
>> - Adjust changelog
>> ---
>>  drivers/cxl/core/features.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/cxl/core/features.c b/drivers/cxl/core/features.c
>> index f4daefe3180e..066dfc29a3dd 100644
>> --- a/drivers/cxl/core/features.c
>> +++ b/drivers/cxl/core/features.c
>> @@ -528,13 +528,13 @@ static void *cxlctl_set_feature(struct cxl_features_state *cxlfs,
>>  	rc = cxl_set_feature(cxl_mbox, &feat_in->uuid,
>>  			     feat_in->version, feat_in->feat_data,
>>  			     data_size, flags, offset, &return_code);
>> +	*out_len = sizeof(*rpc_out);
>>  	if (rc) {
>>  		rpc_out->retval = return_code;
>>  		return no_free_ptr(rpc_out);
>>  	}
>>  
>>  	rpc_out->retval = CXL_MBOX_CMD_RC_SUCCESS;
>> -	*out_len = sizeof(*rpc_out);
>>  
>>  	return no_free_ptr(rpc_out);
>>  }