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scsi: qla2xxx: Fix race condition between iocb timeout and initialisa…
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…tion

qla2x00_init_timer() calls add_timer() on the iocb timeout timer, which
means the timeout function pointer and any data that the function depends on
must be initialised beforehand.

Move this initialisation before each call to qla2x00_init_timer().  In some
cases qla2x00_init_timer() initialises a completion structure needed by the
timeout function, so move the call to add_timer() after that.

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Ben Hutchings authored and Martin K. Petersen committed Apr 10, 2018
1 parent 3a9910d commit e74e7d9
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Showing 8 changed files with 45 additions and 31 deletions.
12 changes: 7 additions & 5 deletions drivers/scsi/qla2xxx/qla_gs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3794,6 +3794,7 @@ int qla24xx_async_gffid(scsi_qla_host_t *vha, fc_port_t *fcport)
sp->gen1 = fcport->rscn_gen;
sp->gen2 = fcport->login_gen;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

/* CT_IU preamble */
Expand All @@ -3812,7 +3813,6 @@ int qla24xx_async_gffid(scsi_qla_host_t *vha, fc_port_t *fcport)
sp->u.iocb_cmd.u.ctarg.rsp_size = GFF_ID_RSP_SIZE;
sp->u.iocb_cmd.u.ctarg.nport_handle = NPH_SNS;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
sp->done = qla24xx_async_gffid_sp_done;

rval = qla2x00_start_sp(sp);
Expand Down Expand Up @@ -4230,6 +4230,8 @@ static int qla24xx_async_gnnft(scsi_qla_host_t *vha, struct srb *sp,
sp->name = "gnnft";
sp->gen1 = vha->hw->base_qpair->chip_reset;
sp->gen2 = fc4_type;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

memset(sp->u.iocb_cmd.u.ctarg.rsp, 0, sp->u.iocb_cmd.u.ctarg.rsp_size);
Expand All @@ -4246,7 +4248,6 @@ static int qla24xx_async_gnnft(scsi_qla_host_t *vha, struct srb *sp,
sp->u.iocb_cmd.u.ctarg.req_size = GNN_FT_REQ_SIZE;
sp->u.iocb_cmd.u.ctarg.nport_handle = NPH_SNS;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
sp->done = qla2x00_async_gpnft_gnnft_sp_done;

rval = qla2x00_start_sp(sp);
Expand Down Expand Up @@ -4370,6 +4371,8 @@ int qla24xx_async_gpnft(scsi_qla_host_t *vha, u8 fc4_type, srb_t *sp)
sp->name = "gpnft";
sp->gen1 = vha->hw->base_qpair->chip_reset;
sp->gen2 = fc4_type;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

rspsz = sizeof(struct ct_sns_gpnft_rsp) +
Expand All @@ -4385,7 +4388,6 @@ int qla24xx_async_gpnft(scsi_qla_host_t *vha, u8 fc4_type, srb_t *sp)

sp->u.iocb_cmd.u.ctarg.nport_handle = NPH_SNS;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
sp->done = qla2x00_async_gpnft_gnnft_sp_done;

rval = qla2x00_start_sp(sp);
Expand Down Expand Up @@ -4495,6 +4497,7 @@ int qla24xx_async_gnnid(scsi_qla_host_t *vha, fc_port_t *fcport)
sp->gen1 = fcport->rscn_gen;
sp->gen2 = fcport->login_gen;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

/* CT_IU preamble */
Expand All @@ -4516,7 +4519,6 @@ int qla24xx_async_gnnid(scsi_qla_host_t *vha, fc_port_t *fcport)
sp->u.iocb_cmd.u.ctarg.rsp_size = GNN_ID_RSP_SIZE;
sp->u.iocb_cmd.u.ctarg.nport_handle = NPH_SNS;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
sp->done = qla2x00_async_gnnid_sp_done;

rval = qla2x00_start_sp(sp);
Expand Down Expand Up @@ -4632,6 +4634,7 @@ int qla24xx_async_gfpnid(scsi_qla_host_t *vha, fc_port_t *fcport)
sp->gen1 = fcport->rscn_gen;
sp->gen2 = fcport->login_gen;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

/* CT_IU preamble */
Expand All @@ -4653,7 +4656,6 @@ int qla24xx_async_gfpnid(scsi_qla_host_t *vha, fc_port_t *fcport)
sp->u.iocb_cmd.u.ctarg.rsp_size = GFPN_ID_RSP_SIZE;
sp->u.iocb_cmd.u.ctarg.nport_handle = NPH_SNS;

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
sp->done = qla2x00_async_gfpnid_sp_done;

rval = qla2x00_start_sp(sp);
Expand Down
37 changes: 23 additions & 14 deletions drivers/scsi/qla2xxx/qla_init.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -183,10 +183,11 @@ qla2x00_async_login(struct scsi_qla_host *vha, fc_port_t *fcport,
sp->name = "login";
sp->gen1 = fcport->rscn_gen;
sp->gen2 = fcport->login_gen;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

lio = &sp->u.iocb_cmd;
lio->timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

sp->done = qla2x00_async_login_sp_done;
lio->u.logio.flags |= SRB_LOGIN_COND_PLOGI;

Expand Down Expand Up @@ -245,10 +246,11 @@ qla2x00_async_logout(struct scsi_qla_host *vha, fc_port_t *fcport)

sp->type = SRB_LOGOUT_CMD;
sp->name = "logout";
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

lio = &sp->u.iocb_cmd;
lio->timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

sp->done = qla2x00_async_logout_sp_done;
rval = qla2x00_start_sp(sp);
if (rval != QLA_SUCCESS)
Expand Down Expand Up @@ -307,10 +309,11 @@ qla2x00_async_prlo(struct scsi_qla_host *vha, fc_port_t *fcport)

sp->type = SRB_PRLO_CMD;
sp->name = "prlo";
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

lio = &sp->u.iocb_cmd;
lio->timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

sp->done = qla2x00_async_prlo_sp_done;
rval = qla2x00_start_sp(sp);
if (rval != QLA_SUCCESS)
Expand Down Expand Up @@ -412,10 +415,11 @@ qla2x00_async_adisc(struct scsi_qla_host *vha, fc_port_t *fcport,

sp->type = SRB_ADISC_CMD;
sp->name = "adisc";
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

lio = &sp->u.iocb_cmd;
lio->timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

sp->done = qla2x00_async_adisc_sp_done;
if (data[1] & QLA_LOGIO_LOGIN_RETRIED)
lio->u.logio.flags |= SRB_LOGIN_RETRIED;
Expand Down Expand Up @@ -745,6 +749,8 @@ int qla24xx_async_gnl(struct scsi_qla_host *vha, fc_port_t *fcport)
sp->gen1 = fcport->rscn_gen;
sp->gen2 = fcport->login_gen;

mbx = &sp->u.iocb_cmd;
mbx->timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha)+2);

mb = sp->u.iocb_cmd.u.mbx.out_mb;
Expand All @@ -757,9 +763,6 @@ int qla24xx_async_gnl(struct scsi_qla_host *vha, fc_port_t *fcport)
mb[8] = vha->gnl.size;
mb[9] = vha->vp_idx;

mbx = &sp->u.iocb_cmd;
mbx->timeout = qla2x00_async_iocb_timeout;

sp->done = qla24xx_async_gnl_sp_done;

rval = qla2x00_start_sp(sp);
Expand Down Expand Up @@ -887,10 +890,11 @@ qla24xx_async_prli(struct scsi_qla_host *vha, fc_port_t *fcport)

sp->type = SRB_PRLI_CMD;
sp->name = "prli";
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

lio = &sp->u.iocb_cmd;
lio->timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

sp->done = qla2x00_async_prli_sp_done;
lio->u.logio.flags = 0;

Expand Down Expand Up @@ -955,6 +959,9 @@ int qla24xx_async_gpdb(struct scsi_qla_host *vha, fc_port_t *fcport, u8 opt)
sp->name = "gpdb";
sp->gen1 = fcport->rscn_gen;
sp->gen2 = fcport->login_gen;

mbx = &sp->u.iocb_cmd;
mbx->timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

pd = dma_pool_zalloc(ha->s_dma_pool, GFP_KERNEL, &pd_dma);
Expand All @@ -974,8 +981,6 @@ int qla24xx_async_gpdb(struct scsi_qla_host *vha, fc_port_t *fcport, u8 opt)
mb[9] = vha->vp_idx;
mb[10] = opt;

mbx = &sp->u.iocb_cmd;
mbx->timeout = qla2x00_async_iocb_timeout;
mbx->u.mbx.in = (void *)pd;
mbx->u.mbx.in_dma = pd_dma;

Expand Down Expand Up @@ -1490,13 +1495,15 @@ qla2x00_async_tm_cmd(fc_port_t *fcport, uint32_t flags, uint32_t lun,
tm_iocb = &sp->u.iocb_cmd;
sp->type = SRB_TM_CMD;
sp->name = "tmf";

tm_iocb->timeout = qla2x00_tmf_iocb_timeout;
init_completion(&tm_iocb->u.tmf.comp);
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha));

tm_iocb->u.tmf.flags = flags;
tm_iocb->u.tmf.lun = lun;
tm_iocb->u.tmf.data = tag;
sp->done = qla2x00_tmf_sp_done;
tm_iocb->timeout = qla2x00_tmf_iocb_timeout;
init_completion(&tm_iocb->u.tmf.comp);

rval = qla2x00_start_sp(sp);
if (rval != QLA_SUCCESS)
Expand Down Expand Up @@ -1570,7 +1577,11 @@ qla24xx_async_abort_cmd(srb_t *cmd_sp)
abt_iocb = &sp->u.iocb_cmd;
sp->type = SRB_ABT_CMD;
sp->name = "abort";

abt_iocb->timeout = qla24xx_abort_iocb_timeout;
init_completion(&abt_iocb->u.abt.comp);
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha));

abt_iocb->u.abt.cmd_hndl = cmd_sp->handle;

if (vha->flags.qpairs_available && cmd_sp->qpair)
Expand All @@ -1580,8 +1591,6 @@ qla24xx_async_abort_cmd(srb_t *cmd_sp)
abt_iocb->u.abt.req_que_no = cpu_to_le16(vha->req->id);

sp->done = qla24xx_abort_sp_done;
abt_iocb->timeout = qla24xx_abort_iocb_timeout;
init_completion(&abt_iocb->u.abt.comp);

rval = qla2x00_start_sp(sp);
if (rval != QLA_SUCCESS)
Expand Down
2 changes: 1 addition & 1 deletion drivers/scsi/qla2xxx/qla_inline.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -272,13 +272,13 @@ qla2x00_init_timer(srb_t *sp, unsigned long tmo)
{
timer_setup(&sp->u.iocb_cmd.timer, qla2x00_sp_timeout, 0);
sp->u.iocb_cmd.timer.expires = jiffies + tmo * HZ;
add_timer(&sp->u.iocb_cmd.timer);
sp->free = qla2x00_sp_free;
init_completion(&sp->comp);
if (IS_QLAFX00(sp->vha->hw) && (sp->type == SRB_FXIOCB_DCMD))
init_completion(&sp->u.iocb_cmd.u.fxiocb.fxiocb_comp);
if (sp->type == SRB_ELS_DCMD)
init_completion(&sp->u.iocb_cmd.u.els_logo.comp);
add_timer(&sp->u.iocb_cmd.timer);
}

static inline int
Expand Down
8 changes: 5 additions & 3 deletions drivers/scsi/qla2xxx/qla_iocb.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2460,8 +2460,8 @@ qla24xx_els_dcmd_iocb(scsi_qla_host_t *vha, int els_opcode,
sp->type = SRB_ELS_DCMD;
sp->name = "ELS_DCMD";
sp->fcport = fcport;
qla2x00_init_timer(sp, ELS_DCMD_TIMEOUT);
elsio->timeout = qla2x00_els_dcmd_iocb_timeout;
qla2x00_init_timer(sp, ELS_DCMD_TIMEOUT);
sp->done = qla2x00_els_dcmd_sp_done;
sp->free = qla2x00_els_dcmd_sp_free;

Expand Down Expand Up @@ -2658,8 +2658,11 @@ qla24xx_els_dcmd2_iocb(scsi_qla_host_t *vha, int els_opcode,
sp->type = SRB_ELS_DCMD;
sp->name = "ELS_DCMD";
sp->fcport = fcport;
qla2x00_init_timer(sp, ELS_DCMD_TIMEOUT);

elsio->timeout = qla2x00_els_dcmd2_iocb_timeout;
init_completion(&elsio->u.els_plogi.comp);
qla2x00_init_timer(sp, ELS_DCMD_TIMEOUT);

sp->done = qla2x00_els_dcmd2_sp_done;
sp->free = qla2x00_els_dcmd2_sp_free;

Expand Down Expand Up @@ -2696,7 +2699,6 @@ qla24xx_els_dcmd2_iocb(scsi_qla_host_t *vha, int els_opcode,
ql_dump_buffer(ql_dbg_io + ql_dbg_buffer, vha, 0x0109,
(uint8_t *)elsio->u.els_plogi.els_plogi_pyld, 0x70);

init_completion(&elsio->u.els_plogi.comp);
rval = qla2x00_start_sp(sp);
if (rval != QLA_SUCCESS) {
rval = QLA_FUNCTION_FAILED;
Expand Down
8 changes: 4 additions & 4 deletions drivers/scsi/qla2xxx/qla_mbx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -6023,14 +6023,14 @@ int qla24xx_send_mb_cmd(struct scsi_qla_host *vha, mbx_cmd_t *mcp)
sp->type = SRB_MB_IOCB;
sp->name = mb_to_str(mcp->mb[0]);

qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

memcpy(sp->u.iocb_cmd.u.mbx.out_mb, mcp->mb, SIZEOF_IOCB_MB_REG);

c = &sp->u.iocb_cmd;
c->timeout = qla2x00_async_iocb_timeout;
init_completion(&c->u.mbx.comp);

qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

memcpy(sp->u.iocb_cmd.u.mbx.out_mb, mcp->mb, SIZEOF_IOCB_MB_REG);

sp->done = qla2x00_async_mb_sp_done;

rval = qla2x00_start_sp(sp);
Expand Down
2 changes: 1 addition & 1 deletion drivers/scsi/qla2xxx/qla_mid.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -929,8 +929,8 @@ int qla24xx_control_vp(scsi_qla_host_t *vha, int cmd)
sp->type = SRB_CTRL_VP;
sp->name = "ctrl_vp";
sp->done = qla_ctrlvp_sp_done;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);
sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);
sp->u.iocb_cmd.u.ctrlvp.cmd = cmd;
sp->u.iocb_cmd.u.ctrlvp.vp_index = vp_index;

Expand Down
5 changes: 3 additions & 2 deletions drivers/scsi/qla2xxx/qla_mr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1821,9 +1821,11 @@ qlafx00_fx_disc(scsi_qla_host_t *vha, fc_port_t *fcport, uint16_t fx_type)

sp->type = SRB_FXIOCB_DCMD;
sp->name = "fxdisc";
qla2x00_init_timer(sp, FXDISC_TIMEOUT);

fdisc = &sp->u.iocb_cmd;
fdisc->timeout = qla2x00_fxdisc_iocb_timeout;
qla2x00_init_timer(sp, FXDISC_TIMEOUT);

switch (fx_type) {
case FXDISC_GET_CONFIG_INFO:
fdisc->u.fxiocb.flags =
Expand Down Expand Up @@ -1924,7 +1926,6 @@ qlafx00_fx_disc(scsi_qla_host_t *vha, fc_port_t *fcport, uint16_t fx_type)
goto done_unmap_req;
}

fdisc->timeout = qla2x00_fxdisc_iocb_timeout;
fdisc->u.fxiocb.req_func_type = cpu_to_le16(fx_type);
sp->done = qla2x00_fxdisc_sp_done;

Expand Down
2 changes: 1 addition & 1 deletion drivers/scsi/qla2xxx/qla_target.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -664,10 +664,10 @@ int qla24xx_async_notify_ack(scsi_qla_host_t *vha, fc_port_t *fcport,
sp->type = type;
sp->name = "nack";

sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha)+2);

sp->u.iocb_cmd.u.nack.ntfy = ntfy;
sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
sp->done = qla2x00_async_nack_sp_done;

rval = qla2x00_start_sp(sp);
Expand Down

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