From a379d69f00f28063a7a1c3de235e2996c2c5a6f5 Mon Sep 17 00:00:00 2001 From: "Vishwanathapura, Niranjana" Date: Wed, 14 Jun 2017 12:34:42 -0700 Subject: [PATCH] IB/opa_vnic: Use spinlock instead of mutex for stats_lock Stats can be read from atomic context, hence make stats_lock as a spinlock. Fix the following trace with debug kernel. BUG: sleeping function called from invalid context at kernel/locking/mutex.c:238 in_atomic(): 1, irqs_disabled(): 0, pid: 6487, name: sadc Call Trace: dump_stack+0x63/0x90 ___might_sleep+0xda/0x130 __might_sleep+0x4a/0x90 mutex_lock+0x20/0x50 opa_vnic_get_stats64+0x56/0x140 [opa_vnic] dev_get_stats+0x74/0x130 dev_seq_printf_stats+0x37/0x120 dev_seq_show+0x14/0x30 seq_read+0x26d/0x3d0 Reviewed-by: Mike Marciniszyn Reviewed-by: Dennis Dalessandro Signed-off-by: Niranjana Vishwanathapura Signed-off-by: Doug Ledford --- drivers/infiniband/ulp/opa_vnic/opa_vnic_ethtool.c | 4 ++-- drivers/infiniband/ulp/opa_vnic/opa_vnic_internal.h | 2 +- drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c | 8 +++----- drivers/infiniband/ulp/opa_vnic/opa_vnic_vema_iface.c | 8 ++++---- 4 files changed, 10 insertions(+), 12 deletions(-) diff --git a/drivers/infiniband/ulp/opa_vnic/opa_vnic_ethtool.c b/drivers/infiniband/ulp/opa_vnic/opa_vnic_ethtool.c index d66540e24885..62390e9e0023 100644 --- a/drivers/infiniband/ulp/opa_vnic/opa_vnic_ethtool.c +++ b/drivers/infiniband/ulp/opa_vnic/opa_vnic_ethtool.c @@ -146,15 +146,15 @@ static void vnic_get_ethtool_stats(struct net_device *netdev, int i; memset(&vstats, 0, sizeof(vstats)); - mutex_lock(&adapter->stats_lock); + spin_lock(&adapter->stats_lock); adapter->rn_ops->ndo_get_stats64(netdev, &vstats.netstats); + spin_unlock(&adapter->stats_lock); for (i = 0; i < VNIC_STATS_LEN; i++) { char *p = (char *)&vstats + vnic_gstrings_stats[i].stat_offset; data[i] = (vnic_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p; } - mutex_unlock(&adapter->stats_lock); } /* vnic_get_strings - get strings */ diff --git a/drivers/infiniband/ulp/opa_vnic/opa_vnic_internal.h b/drivers/infiniband/ulp/opa_vnic/opa_vnic_internal.h index 6bba886bec1f..ca29e6d5aedc 100644 --- a/drivers/infiniband/ulp/opa_vnic/opa_vnic_internal.h +++ b/drivers/infiniband/ulp/opa_vnic/opa_vnic_internal.h @@ -214,7 +214,7 @@ struct opa_vnic_adapter { struct mutex mactbl_lock; /* Lock used to protect access to vnic counters */ - struct mutex stats_lock; + spinlock_t stats_lock; u8 flow_tbl[OPA_VNIC_FLOW_TBL_SIZE]; diff --git a/drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c b/drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c index 905f39dda5aa..78d9007bc2f6 100644 --- a/drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c +++ b/drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c @@ -69,9 +69,9 @@ static void opa_vnic_get_stats64(struct net_device *netdev, struct opa_vnic_stats vstats; memset(&vstats, 0, sizeof(vstats)); - mutex_lock(&adapter->stats_lock); + spin_lock(&adapter->stats_lock); adapter->rn_ops->ndo_get_stats64(netdev, &vstats.netstats); - mutex_unlock(&adapter->stats_lock); + spin_unlock(&adapter->stats_lock); memcpy(stats, &vstats.netstats, sizeof(*stats)); } @@ -344,7 +344,7 @@ struct opa_vnic_adapter *opa_vnic_add_netdev(struct ib_device *ibdev, netdev->hard_header_len += OPA_VNIC_SKB_HEADROOM; mutex_init(&adapter->lock); mutex_init(&adapter->mactbl_lock); - mutex_init(&adapter->stats_lock); + spin_lock_init(&adapter->stats_lock); SET_NETDEV_DEV(netdev, ibdev->dev.parent); @@ -364,7 +364,6 @@ struct opa_vnic_adapter *opa_vnic_add_netdev(struct ib_device *ibdev, netdev_err: mutex_destroy(&adapter->lock); mutex_destroy(&adapter->mactbl_lock); - mutex_destroy(&adapter->stats_lock); kfree(adapter); adapter_err: ibdev->free_rdma_netdev(netdev); @@ -383,7 +382,6 @@ void opa_vnic_rem_netdev(struct opa_vnic_adapter *adapter) opa_vnic_release_mac_tbl(adapter); mutex_destroy(&adapter->lock); mutex_destroy(&adapter->mactbl_lock); - mutex_destroy(&adapter->stats_lock); kfree(adapter); ibdev->free_rdma_netdev(netdev); } diff --git a/drivers/infiniband/ulp/opa_vnic/opa_vnic_vema_iface.c b/drivers/infiniband/ulp/opa_vnic/opa_vnic_vema_iface.c index a51bf977f4d6..c2733964379c 100644 --- a/drivers/infiniband/ulp/opa_vnic/opa_vnic_vema_iface.c +++ b/drivers/infiniband/ulp/opa_vnic/opa_vnic_vema_iface.c @@ -89,9 +89,9 @@ void opa_vnic_get_summary_counters(struct opa_vnic_adapter *adapter, u64 *src; memset(&vstats, 0, sizeof(vstats)); - mutex_lock(&adapter->stats_lock); + spin_lock(&adapter->stats_lock); adapter->rn_ops->ndo_get_stats64(adapter->netdev, &vstats.netstats); - mutex_unlock(&adapter->stats_lock); + spin_unlock(&adapter->stats_lock); cntrs->vp_instance = cpu_to_be16(adapter->vport_num); cntrs->vesw_id = cpu_to_be16(adapter->info.vesw.vesw_id); @@ -128,9 +128,9 @@ void opa_vnic_get_error_counters(struct opa_vnic_adapter *adapter, struct opa_vnic_stats vstats; memset(&vstats, 0, sizeof(vstats)); - mutex_lock(&adapter->stats_lock); + spin_lock(&adapter->stats_lock); adapter->rn_ops->ndo_get_stats64(adapter->netdev, &vstats.netstats); - mutex_unlock(&adapter->stats_lock); + spin_unlock(&adapter->stats_lock); cntrs->vp_instance = cpu_to_be16(adapter->vport_num); cntrs->vesw_id = cpu_to_be16(adapter->info.vesw.vesw_id); -- 2.39.2