Re: [PATCH 1/4] cxl/security: Fix Get Security State output payload endian handling

[Ira Weiny <ira.weiny@intel.com>]

On Mon, Dec 05, 2022 at 08:22:28PM -0800, Dan Williams wrote:
> Multi-byte integer values in CXL mailbox payloads are little endian. Add
> a definition of the Get Security State output payload and convert the
> value before testing flags.
> 
> Fixes: 328281155539 ("cxl/pmem: Introduce nvdimm_security_ops with ->get_flags() operation")
> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Cc: Dave Jiang <dave.jiang@intel.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Reviewed-by: Ira Weiny <ira.weiny@intel.com>

> ---
>  drivers/cxl/security.c |    6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/security.c b/drivers/cxl/security.c
> index 5484d4eecfd1..ebb78b8944f5 100644
> --- a/drivers/cxl/security.c
> +++ b/drivers/cxl/security.c
> @@ -16,14 +16,18 @@ static unsigned long cxl_pmem_get_security_flags(struct nvdimm *nvdimm,
>  	struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
>  	struct cxl_dev_state *cxlds = cxlmd->cxlds;
>  	unsigned long security_flags = 0;
> +	struct cxl_get_security_output {
> +		__le32 flags;
> +	} out;
>  	u32 sec_out;
>  	int rc;
>  
>  	rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_SECURITY_STATE, NULL, 0,
> -			       &sec_out, sizeof(sec_out));
> +			       &out, sizeof(out));
>  	if (rc < 0)
>  		return 0;
>  
> +	sec_out = le32_to_cpu(out.flags);
>  	if (ptype == NVDIMM_MASTER) {
>  		if (sec_out & CXL_PMEM_SEC_STATE_MASTER_PASS_SET)
>  			set_bit(NVDIMM_SECURITY_UNLOCKED, &security_flags);
>