net/smc: switch smcd_dev_list spinlock to mutex

The similar smc_ib_devices spinlock has been converted to a mutex.
Protecting the smcd_dev_list by a mutex is possible as well. This
patch converts the smcd_dev_list spinlock to a mutex.

Fixes: c6ba7c9ba43d ("net/smc: add base infrastructure for SMC-D and ISM")
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 8bf34d9..f69d205 100644 (file)
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -1971,11 +1971,11 @@ static void smc_core_going_away(void)
        }
        mutex_unlock(&smc_ib_devices.mutex);
 
-       spin_lock(&smcd_dev_list.lock);
+       mutex_lock(&smcd_dev_list.mutex);
        list_for_each_entry(smcd, &smcd_dev_list.list, list) {
                smcd->going_away = 1;
        }
-       spin_unlock(&smcd_dev_list.lock);
+       mutex_unlock(&smcd_dev_list.mutex);
 }
 
 /* Clean up all SMC link groups */
@@ -1987,10 +1987,10 @@ static void smc_lgrs_shutdown(void)
 
        smc_smcr_terminate_all(NULL);
 
-       spin_lock(&smcd_dev_list.lock);
+       mutex_lock(&smcd_dev_list.mutex);
        list_for_each_entry(smcd, &smcd_dev_list.list, list)
                smc_smcd_terminate_all(smcd);
-       spin_unlock(&smcd_dev_list.lock);
+       mutex_unlock(&smcd_dev_list.mutex);
 }
 
 static int smc_core_reboot_event(struct notifier_block *this,

diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index 91f85fc..998c525 100644 (file)
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/spinlock.h>
+#include <linux/mutex.h>
 #include <linux/slab.h>
 #include <asm/page.h>
 
@@ -17,7 +18,7 @@
 
 struct smcd_dev_list smcd_dev_list = {
        .list = LIST_HEAD_INIT(smcd_dev_list.list),
-       .lock = __SPIN_LOCK_UNLOCKED(smcd_dev_list.lock)
+       .mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
 };
 
 /* Test if an ISM communication is possible. */
@@ -317,9 +318,9 @@ EXPORT_SYMBOL_GPL(smcd_alloc_dev);
 
 int smcd_register_dev(struct smcd_dev *smcd)
 {
-       spin_lock(&smcd_dev_list.lock);
+       mutex_lock(&smcd_dev_list.mutex);
        list_add_tail(&smcd->list, &smcd_dev_list.list);
-       spin_unlock(&smcd_dev_list.lock);
+       mutex_unlock(&smcd_dev_list.mutex);
 
        pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
                            dev_name(&smcd->dev), smcd->pnetid,
@@ -333,9 +334,9 @@ void smcd_unregister_dev(struct smcd_dev *smcd)
 {
        pr_warn_ratelimited("smc: removing smcd device %s\n",
                            dev_name(&smcd->dev));
-       spin_lock(&smcd_dev_list.lock);
+       mutex_lock(&smcd_dev_list.mutex);
        list_del_init(&smcd->list);
-       spin_unlock(&smcd_dev_list.lock);
+       mutex_unlock(&smcd_dev_list.mutex);
        smcd->going_away = 1;
        smc_smcd_terminate_all(smcd);
        flush_workqueue(smcd->event_wq);

diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h
index 4da946c..81cc453 100644 (file)
--- a/net/smc/smc_ism.h
+++ b/net/smc/smc_ism.h
@@ -10,12 +10,13 @@
 #define SMCD_ISM_H
 
 #include <linux/uio.h>
+#include <linux/mutex.h>
 
 #include "smc.h"
 
 struct smcd_dev_list { /* List of SMCD devices */
        struct list_head list;
-       spinlock_t lock;        /* Protects list of devices */
+       struct mutex mutex;     /* Protects list of devices */
 };
 
 extern struct smcd_dev_list    smcd_dev_list; /* list of smcd devices */

diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
index d4aac31..30e5fac 100644 (file)
--- a/net/smc/smc_pnet.c
+++ b/net/smc/smc_pnet.c
@@ -152,7 +152,7 @@ static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
        }
        mutex_unlock(&smc_ib_devices.mutex);
        /* remove smcd devices */
-       spin_lock(&smcd_dev_list.lock);
+       mutex_lock(&smcd_dev_list.mutex);
        list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
                if (smcd_dev->pnetid_by_user &&
                    (!pnet_name ||
@@ -166,7 +166,7 @@ static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
                        rc = 0;
                }
        }
-       spin_unlock(&smcd_dev_list.lock);
+       mutex_unlock(&smcd_dev_list.mutex);
        return rc;
 }
 
@@ -259,13 +259,13 @@ static bool smc_pnet_apply_smcd(struct smcd_dev *smcd_dev, char *pnet_name)
        u8 pnet_null[SMC_MAX_PNETID_LEN] = {0};
        bool applied = false;
 
-       spin_lock(&smcd_dev_list.lock);
+       mutex_lock(&smcd_dev_list.mutex);
        if (smc_pnet_match(smcd_dev->pnetid, pnet_null)) {
                memcpy(smcd_dev->pnetid, pnet_name, SMC_MAX_PNETID_LEN);
                smcd_dev->pnetid_by_user = true;
                applied = true;
        }
-       spin_unlock(&smcd_dev_list.lock);
+       mutex_unlock(&smcd_dev_list.mutex);
        return applied;
 }
 
@@ -321,7 +321,7 @@ static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
 {
        struct smcd_dev *smcd_dev;
 
-       spin_lock(&smcd_dev_list.lock);
+       mutex_lock(&smcd_dev_list.mutex);
        list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
                if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
                             IB_DEVICE_NAME_MAX - 1))
@@ -329,7 +329,7 @@ static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
        }
        smcd_dev = NULL;
 out:
-       spin_unlock(&smcd_dev_list.lock);
+       mutex_unlock(&smcd_dev_list.mutex);
        return smcd_dev;
 }
 
@@ -925,7 +925,7 @@ static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
            smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
                return; /* pnetid could not be determined */
 
-       spin_lock(&smcd_dev_list.lock);
+       mutex_lock(&smcd_dev_list.mutex);
        list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
                if (smc_pnet_match(ismdev->pnetid, ndev_pnetid) &&
                    !ismdev->going_away) {
@@ -933,7 +933,7 @@ static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
                        break;
                }
        }
-       spin_unlock(&smcd_dev_list.lock);
+       mutex_unlock(&smcd_dev_list.mutex);
 }
 
 /* PNET table analysis for a given sock: