Messages in this thread | | | Date | Thu, 22 Sep 2022 14:51:52 +0530 | From | Rahul Lakkireddy <> | Subject | Re: [RFC PATCH net-next 1/1] cxgb4: fix missing unlock on ETHOFLD desc collect fail path |
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On Thursday, September 09/22/22, 2022 at 02:32:36 -0300, Rafael Mendonca wrote: > The label passed to the QDESC_GET for the ETHOFLD TXQ, RXQ, and FLQ, is the > 'out' one, which skips the 'out_unlock' label, and thus doesn't unlock the > 'uld_mutex' before returning. Additionally, since commit 5148e5950c67 > ("cxgb4: add EOTID tracking and software context dump"), the access to > these ETHOFLD hardware queues should be protected by the 'mqprio_mutex' > instead. > > Fixes: 2d0cb84dd973 ("cxgb4: add ETHOFLD hardware queue support") > Fixes: 5148e5950c67 ("cxgb4: add EOTID tracking and software context dump") > Signed-off-by: Rafael Mendonca <rafaelmendsr@gmail.com>
Yes, the ETHOFLD queues do need to be accessed after unlocking the uld_mutex and then taking the mqprio_mutex. Thanks for the fix!
Reviewed-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
> --- > .../net/ethernet/chelsio/cxgb4/cudbg_lib.c | 28 +++++++++++++------ > 1 file changed, 19 insertions(+), 9 deletions(-) > > diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c > index a7f291c89702..557c591a6ce3 100644 > --- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c > +++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c > @@ -14,6 +14,7 @@ > #include "cudbg_entity.h" > #include "cudbg_lib.h" > #include "cudbg_zlib.h" > +#include "cxgb4_tc_mqprio.h" > > static const u32 t6_tp_pio_array[][IREG_NUM_ELEM] = { > {0x7e40, 0x7e44, 0x020, 28}, /* t6_tp_pio_regs_20_to_3b */ > @@ -3458,7 +3459,7 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init, > for (i = 0; i < utxq->ntxq; i++) > QDESC_GET_TXQ(&utxq->uldtxq[i].q, > cudbg_uld_txq_to_qtype(j), > - out_unlock); > + out_unlock_uld); > } > } > > @@ -3475,7 +3476,7 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init, > for (i = 0; i < urxq->nrxq; i++) > QDESC_GET_RXQ(&urxq->uldrxq[i].rspq, > cudbg_uld_rxq_to_qtype(j), > - out_unlock); > + out_unlock_uld); > } > > /* ULD FLQ */ > @@ -3487,7 +3488,7 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init, > for (i = 0; i < urxq->nrxq; i++) > QDESC_GET_FLQ(&urxq->uldrxq[i].fl, > cudbg_uld_flq_to_qtype(j), > - out_unlock); > + out_unlock_uld); > } > > /* ULD CIQ */ > @@ -3500,29 +3501,34 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init, > for (i = 0; i < urxq->nciq; i++) > QDESC_GET_RXQ(&urxq->uldrxq[base + i].rspq, > cudbg_uld_ciq_to_qtype(j), > - out_unlock); > + out_unlock_uld); > } > } > + mutex_unlock(&uld_mutex); > + > + if (!padap->tc_mqprio) > + goto out; > > + mutex_lock(&padap->tc_mqprio->mqprio_mutex); > /* ETHOFLD TXQ */ > if (s->eohw_txq) > for (i = 0; i < s->eoqsets; i++) > QDESC_GET_TXQ(&s->eohw_txq[i].q, > - CUDBG_QTYPE_ETHOFLD_TXQ, out); > + CUDBG_QTYPE_ETHOFLD_TXQ, out_unlock_mqprio); > > /* ETHOFLD RXQ and FLQ */ > if (s->eohw_rxq) { > for (i = 0; i < s->eoqsets; i++) > QDESC_GET_RXQ(&s->eohw_rxq[i].rspq, > - CUDBG_QTYPE_ETHOFLD_RXQ, out); > + CUDBG_QTYPE_ETHOFLD_RXQ, out_unlock_mqprio); > > for (i = 0; i < s->eoqsets; i++) > QDESC_GET_FLQ(&s->eohw_rxq[i].fl, > - CUDBG_QTYPE_ETHOFLD_FLQ, out); > + CUDBG_QTYPE_ETHOFLD_FLQ, out_unlock_mqprio); > } > > -out_unlock: > - mutex_unlock(&uld_mutex); > +out_unlock_mqprio: > + mutex_unlock(&padap->tc_mqprio->mqprio_mutex); > > out: > qdesc_info->qdesc_entry_size = sizeof(*qdesc_entry); > @@ -3559,6 +3565,10 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init, > #undef QDESC_GET > > return rc; > + > +out_unlock_uld: > + mutex_unlock(&uld_mutex); > + goto out; > } > > int cudbg_collect_flash(struct cudbg_init *pdbg_init, > -- > 2.34.1 >
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