Re: [PATCH 3/8] qla2xxx: Fix SRB leak on switch command timeout

["Ewan D. Milne" <emilne@redhat.com>]

On Tue, 2019-11-05 at 07:06 -0800, Himanshu Madhani wrote:
> From: Quinn Tran <qutran@marvell.com>
> 
> when GPSC/GPDB switch command fails, driver just returns
> without doing a proper cleanup. This patch fixes this memory
> leak by calling sp->free() in the error path.
> 
> Signed-off-by: Quinn Tran <qutran@marvell.com>
> Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
> ---
>  drivers/scsi/qla2xxx/qla_gs.c   |  2 +-
>  drivers/scsi/qla2xxx/qla_init.c | 11 +++++------
>  drivers/scsi/qla2xxx/qla_mbx.c  |  4 ----
>  drivers/scsi/qla2xxx/qla_mid.c  | 11 ++++-------
>  drivers/scsi/qla2xxx/qla_os.c   |  7 ++++++-
>  5 files changed, 16 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/scsi/qla2xxx/qla_gs.c b/drivers/scsi/qla2xxx/qla_gs.c
> index 7a00272ca380..67230688b05e 100644
> --- a/drivers/scsi/qla2xxx/qla_gs.c
> +++ b/drivers/scsi/qla2xxx/qla_gs.c
> @@ -3010,7 +3010,7 @@ static void qla24xx_async_gpsc_sp_done(srb_t *sp, int res)
>  	fcport->flags &= ~(FCF_ASYNC_SENT | FCF_ASYNC_ACTIVE);
>  
>  	if (res == QLA_FUNCTION_TIMEOUT)
> -		return;
> +		goto done;
>  
>  	if (res == (DID_ERROR << 16)) {
>  		/* entry status error */
> diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
> index 7fdbe041cc19..bddb26baedd2 100644
> --- a/drivers/scsi/qla2xxx/qla_init.c
> +++ b/drivers/scsi/qla2xxx/qla_init.c
> @@ -1151,19 +1151,18 @@ static void qla24xx_async_gpdb_sp_done(srb_t *sp, int res)
>  	    "Async done-%s res %x, WWPN %8phC mb[1]=%x mb[2]=%x \n",
>  	    sp->name, res, fcport->port_name, mb[1], mb[2]);
>  
> -	if (res == QLA_FUNCTION_TIMEOUT) {
> -		dma_pool_free(sp->vha->hw->s_dma_pool, sp->u.iocb_cmd.u.mbx.in,
> -			sp->u.iocb_cmd.u.mbx.in_dma);
> -		return;
> -	}
> -
>  	fcport->flags &= ~(FCF_ASYNC_SENT | FCF_ASYNC_ACTIVE);
> +
> +	if (res == QLA_FUNCTION_TIMEOUT)
> +		goto done;
> +
>  	memset(&ea, 0, sizeof(ea));
>  	ea.fcport = fcport;
>  	ea.sp = sp;
>  
>  	qla24xx_handle_gpdb_event(vha, &ea);
>  
> +done:
>  	dma_pool_free(ha->s_dma_pool, sp->u.iocb_cmd.u.mbx.in,
>  		sp->u.iocb_cmd.u.mbx.in_dma);
>  
> diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
> index 04175c91af0e..0cf94f05f008 100644
> --- a/drivers/scsi/qla2xxx/qla_mbx.c
> +++ b/drivers/scsi/qla2xxx/qla_mbx.c
> @@ -6288,17 +6288,13 @@ int qla24xx_send_mb_cmd(struct scsi_qla_host *vha, mbx_cmd_t *mcp)
>  	case  QLA_SUCCESS:
>  		ql_dbg(ql_dbg_mbx, vha, 0x119d, "%s: %s done.\n",
>  		    __func__, sp->name);
> -		sp->free(sp);
>  		break;
>  	default:
>  		ql_dbg(ql_dbg_mbx, vha, 0x119e, "%s: %s Failed. %x.\n",
>  		    __func__, sp->name, rval);
> -		sp->free(sp);
>  		break;
>  	}
>  
> -	return rval;
> -
>  done_free_sp:
>  	sp->free(sp);
>  done:
> diff --git a/drivers/scsi/qla2xxx/qla_mid.c b/drivers/scsi/qla2xxx/qla_mid.c
> index 6afad68e5ba2..bd62c4595b73 100644
> --- a/drivers/scsi/qla2xxx/qla_mid.c
> +++ b/drivers/scsi/qla2xxx/qla_mid.c
> @@ -944,7 +944,7 @@ int qla24xx_control_vp(scsi_qla_host_t *vha, int cmd)
>  
>  	sp = qla2x00_get_sp(base_vha, NULL, GFP_KERNEL);
>  	if (!sp)
> -		goto done;
> +		return rval;
>  
>  	sp->type = SRB_CTRL_VP;
>  	sp->name = "ctrl_vp";
> @@ -960,7 +960,7 @@ int qla24xx_control_vp(scsi_qla_host_t *vha, int cmd)
>  		ql_dbg(ql_dbg_async, vha, 0xffff,
>  		    "%s: %s Failed submission. %x.\n",
>  		    __func__, sp->name, rval);
> -		goto done_free_sp;
> +		goto done;
>  	}
>  
>  	ql_dbg(ql_dbg_vport, vha, 0x113f, "%s hndl %x submitted\n",
> @@ -978,16 +978,13 @@ int qla24xx_control_vp(scsi_qla_host_t *vha, int cmd)
>  	case QLA_SUCCESS:
>  		ql_dbg(ql_dbg_vport, vha, 0xffff, "%s: %s done.\n",
>  		    __func__, sp->name);
> -		goto done_free_sp;
> +		break;
>  	default:
>  		ql_dbg(ql_dbg_vport, vha, 0xffff, "%s: %s Failed. %x.\n",
>  		    __func__, sp->name, rval);
> -		goto done_free_sp;
> +		break;
>  	}
>  done:
> -	return rval;
> -
> -done_free_sp:
>  	sp->free(sp);
>  	return rval;
>  }
> diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
> index 588e0d27f151..2e7a4a2d6c5a 100644
> --- a/drivers/scsi/qla2xxx/qla_os.c
> +++ b/drivers/scsi/qla2xxx/qla_os.c
> @@ -996,7 +996,7 @@ qla2xxx_mqueuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd,
>  		ql_dbg(ql_dbg_io + ql_dbg_verbose, vha, 0x3078,
>  		    "Start scsi failed rval=%d for cmd=%p.\n", rval, cmd);
>  		if (rval == QLA_INTERFACE_ERROR)
> -			goto qc24_fail_command;
> +			goto qc24_free_sp_fail_command;
>  		goto qc24_host_busy_free_sp;
>  	}
>  
> @@ -1008,6 +1008,11 @@ qla2xxx_mqueuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd,
>  qc24_target_busy:
>  	return SCSI_MLQUEUE_TARGET_BUSY;
>  
> +qc24_free_sp_fail_command:
> +	sp->free(sp);
> +	CMD_SP(cmd) = NULL;
> +	qla2xxx_rel_qpair_sp(sp->qpair, sp);
> +
>  qc24_fail_command:
>  	cmd->scsi_done(cmd);
>  

Reviewed-by: Ewan D. Milne <emilne@redhat.com>