Re: [PATCH] scsi: ufs: mark HPB support as BROKEN

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On 10/26/21 9:12 AM, Christoph Hellwig wrote:
> The HPB support added this merge window is fundanetally flawed as it
> uses blk_insert_cloned_request to insert a cloned request onto the same
> queue as the one that the original request came from, leading to all
> kinds of issues in blk-mq accounting (in addition to this API being
> a special case for dm-mpath that should not see other users).
> 
> Mark is as BROKEN as the non-intrusive alternative to a last minute
> large scale revert.
> 
> Fixes: f02bc9754a68 ("scsi: ufs: ufshpb: Introduce Host Performance Buffer
> feature")
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  drivers/scsi/ufs/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
> index 432df76e6318a..7835d9082aae4 100644
> --- a/drivers/scsi/ufs/Kconfig
> +++ b/drivers/scsi/ufs/Kconfig
> @@ -186,7 +186,7 @@ config SCSI_UFS_CRYPTO
>  
>  config SCSI_UFS_HPB
>  	bool "Support UFS Host Performance Booster"
> -	depends on SCSI_UFSHCD
> +	depends on SCSI_UFSHCD && BROKEN
>  	help
>  	  The UFS HPB feature improves random read performance. It caches
>  	  L2P (logical to physical) map of UFS to host DRAM. The driver uses HPB
> 
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@xxxxxxx			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer



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