RE: [PATCH v3 06/18] scsi: ufs: Remove ufshcd_valid_tag()

[Daejun Park <daejun7.park@samsung.com>]

Hi Bart,

> @@ -6979,24 +6966,15 @@ static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag)
>   */
>  static int ufshcd_abort(struct scsi_cmnd *cmd)
>  {
> -        struct Scsi_Host *host;
> -        struct ufs_hba *hba;
> +        struct Scsi_Host *host = cmd->device->host;
> +        struct ufs_hba *hba = shost_priv(host);
> +        unsigned int tag = cmd->request->tag;
> +        struct ufshcd_lrb *lrbp = &hba->lrb[tag];

If tag < 0, lrbp will be assigned incorrect pointer.

>          unsigned long flags;
> -        unsigned int tag;
>          int err = 0;
> -        struct ufshcd_lrb *lrbp;
>          u32 reg;
>  
> -        host = cmd->device->host;
> -        hba = shost_priv(host);
> -        tag = cmd->request->tag;
> -        lrbp = &hba->lrb[tag];
> -        if (!ufshcd_valid_tag(hba, tag)) {
> -                dev_err(hba->dev,
> -                        "%s: invalid command tag %d: cmd=0x%p, cmd->request=0x%p",
> -                        __func__, tag, cmd, cmd->request);
> -                BUG();
> -        }
> +        WARN_ONCE(tag < 0, "Invalid tag %d\n", tag);
>  
>          ufshcd_hold(hba, false);
>          reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);

Thanks,
Daejun