diff mbox series

[1/2] scsi: ufs: core: Fix mcq tag calcualtion

Message ID 20230215123750.15785-1-powen.kao@mediatek.com (mailing list archive)
State Superseded
Headers show
Series [1/2] scsi: ufs: core: Fix mcq tag calcualtion | expand

Commit Message

Powen Kao (高伯文) Feb. 15, 2023, 12:37 p.m. UTC
Transfer command descriptor is allocated in ufshcd_memory_alloc()
and referenced by transfer request descriptor with stride size
sizeof_utp_transfer_cmd_desc()
instead of
sizeof(struct utp_transfer_cmd_desc).

Consequently, computing tag by address offset should also refer to the
same stride.

Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>
---
 drivers/ufs/core/ufs-mcq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Bart Van Assche Feb. 15, 2023, 5:34 p.m. UTC | #1
On 2/15/23 04:37, Po-Wen Kao wrote:
> Transfer command descriptor is allocated in ufshcd_memory_alloc()
> and referenced by transfer request descriptor with stride size
> sizeof_utp_transfer_cmd_desc()
> instead of
> sizeof(struct utp_transfer_cmd_desc).
> 
> Consequently, computing tag by address offset should also refer to the
> same stride.
> 
> Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>
> ---
>   drivers/ufs/core/ufs-mcq.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 31df052fbc41..3a27fa4b0024 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -265,7 +265,7 @@ static int ufshcd_mcq_get_tag(struct ufs_hba *hba,
>   	addr = (le64_to_cpu(cqe->command_desc_base_addr) & CQE_UCD_BA) -
>   		hba->ucdl_dma_addr;
>   
> -	return div_u64(addr, sizeof(struct utp_transfer_cmd_desc));
> +	return div_u64(addr, sizeof_utp_transfer_cmd_desc(hba));
>   }
>   
>   static void ufshcd_mcq_process_cqe(struct ufs_hba *hba,

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Stanley Chu Feb. 16, 2023, 12:51 a.m. UTC | #2
On Wed, Feb 15, 2023 at 8:38 PM Po-Wen Kao <powen.kao@mediatek.com> wrote:
>
> Transfer command descriptor is allocated in ufshcd_memory_alloc()
> and referenced by transfer request descriptor with stride size
> sizeof_utp_transfer_cmd_desc()
> instead of
> sizeof(struct utp_transfer_cmd_desc).
>
> Consequently, computing tag by address offset should also refer to the
> same stride.
>
> Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>

Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Manivannan Sadhasivam Feb. 16, 2023, 7:40 a.m. UTC | #3
On Wed, Feb 15, 2023 at 08:37:45PM +0800, Po-Wen Kao wrote:
> Transfer command descriptor is allocated in ufshcd_memory_alloc()
> and referenced by transfer request descriptor with stride size
> sizeof_utp_transfer_cmd_desc()
> instead of
> sizeof(struct utp_transfer_cmd_desc).
> 
> Consequently, computing tag by address offset should also refer to the
> same stride.
> 
> Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>

Fixes tag?

> ---
>  drivers/ufs/core/ufs-mcq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 31df052fbc41..3a27fa4b0024 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -265,7 +265,7 @@ static int ufshcd_mcq_get_tag(struct ufs_hba *hba,
>  	addr = (le64_to_cpu(cqe->command_desc_base_addr) & CQE_UCD_BA) -
>  		hba->ucdl_dma_addr;
>  
> -	return div_u64(addr, sizeof(struct utp_transfer_cmd_desc));
> +	return div_u64(addr, sizeof_utp_transfer_cmd_desc(hba));

I think it is not a good practice to name variables after the standard
operators like sizeof(). It is confusing at its best.

How about renaming this function to get_ucd_size() or something relevant?

But the change itself LGTM!

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>

Thanks,
Mani

>  }
>  
>  static void ufshcd_mcq_process_cqe(struct ufs_hba *hba,
> -- 
> 2.18.0
>
diff mbox series

Patch

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 31df052fbc41..3a27fa4b0024 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -265,7 +265,7 @@  static int ufshcd_mcq_get_tag(struct ufs_hba *hba,
 	addr = (le64_to_cpu(cqe->command_desc_base_addr) & CQE_UCD_BA) -
 		hba->ucdl_dma_addr;
 
-	return div_u64(addr, sizeof(struct utp_transfer_cmd_desc));
+	return div_u64(addr, sizeof_utp_transfer_cmd_desc(hba));
 }
 
 static void ufshcd_mcq_process_cqe(struct ufs_hba *hba,