cxgb4: fix missing unlock on ETHOFLD desc collect fail path

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>
Reviewed-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Link: https://lore.kernel.org/r/20220922175109.764898-1-rafaelmendsr@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
index a7f291c..557c591 100644 (file)
--- 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 @@ out_free:
 #undef QDESC_GET
 
        return rc;
+
+out_unlock_uld:
+       mutex_unlock(&uld_mutex);
+       goto out;
 }
 
 int cudbg_collect_flash(struct cudbg_init *pdbg_init,