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 <mike.marciniszyn@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/opa_vnic/opa_vnic_ethtool.c b/drivers/infiniband/ulp/opa_vnic/opa_vnic_ethtool.c
index d66540e..62390e9 100644 (file)
--- 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 6bba886..ca29e6d 100644 (file)
--- 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 905f39d..78d9007 100644 (file)
--- 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 a51bf97..c273396 100644 (file)
--- 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);