lockable: replaced locks with lock guard macros where appropriate

- ran regexp "qemu_mutex_lock\(.*\).*\n.*if" to find targets
- replaced result with QEMU_LOCK_GUARD if all unlocks at function end
- replaced result with WITH_QEMU_LOCK_GUARD if unlock not at end

Signed-off-by: Daniel Brodsky <dnbrdsky@gmail.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-id: 20200404042108.389635-3-dnbrdsky@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block/iscsi.c

@@ -1394,20 +1394,17 @@ static void iscsi_nop_timed_event(void *opaque)
 {
     IscsiLun *iscsilun = opaque;
 
-    qemu_mutex_lock(&iscsilun->mutex);
+    QEMU_LOCK_GUARD(&iscsilun->mutex);
     if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
         error_report("iSCSI: NOP timeout. Reconnecting...");
         iscsilun->request_timed_out = true;
     } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
         error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
-        goto out;
+        return;
     }
 
     timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
     iscsi_set_events(iscsilun);
-
-out:
-    qemu_mutex_unlock(&iscsilun->mutex);
 }
 
 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)

block/nfs.c

@@ -273,15 +273,14 @@ static int coroutine_fn nfs_co_preadv(BlockDriverState *bs, uint64_t offset,
     nfs_co_init_task(bs, &task);
     task.iov = iov;
 
-    qemu_mutex_lock(&client->mutex);
-    if (nfs_pread_async(client->context, client->fh,
-                        offset, bytes, nfs_co_generic_cb, &task) != 0) {
-        qemu_mutex_unlock(&client->mutex);
-        return -ENOMEM;
-    }
+    WITH_QEMU_LOCK_GUARD(&client->mutex) {
+        if (nfs_pread_async(client->context, client->fh,
+                            offset, bytes, nfs_co_generic_cb, &task) != 0) {
+            return -ENOMEM;
+        }
 
-    nfs_set_events(client);
-    qemu_mutex_unlock(&client->mutex);
+        nfs_set_events(client);
+    }
     while (!task.complete) {
         qemu_coroutine_yield();
     }
@@ -320,19 +319,18 @@ static int coroutine_fn nfs_co_pwritev(BlockDriverState *bs, uint64_t offset,
         buf = iov->iov[0].iov_base;
     }
 
-    qemu_mutex_lock(&client->mutex);
-    if (nfs_pwrite_async(client->context, client->fh,
-                         offset, bytes, buf,
-                         nfs_co_generic_cb, &task) != 0) {
-        qemu_mutex_unlock(&client->mutex);
-        if (my_buffer) {
-            g_free(buf);
+    WITH_QEMU_LOCK_GUARD(&client->mutex) {
+        if (nfs_pwrite_async(client->context, client->fh,
+                             offset, bytes, buf,
+                             nfs_co_generic_cb, &task) != 0) {
+            if (my_buffer) {
+                g_free(buf);
+            }
+            return -ENOMEM;
         }
-        return -ENOMEM;
-    }
 
-    nfs_set_events(client);
-    qemu_mutex_unlock(&client->mutex);
+        nfs_set_events(client);
+    }
     while (!task.complete) {
         qemu_coroutine_yield();
     }
@@ -355,15 +353,14 @@ static int coroutine_fn nfs_co_flush(BlockDriverState *bs)
 
     nfs_co_init_task(bs, &task);
 
-    qemu_mutex_lock(&client->mutex);
-    if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
-                        &task) != 0) {
-        qemu_mutex_unlock(&client->mutex);
-        return -ENOMEM;
-    }
+    WITH_QEMU_LOCK_GUARD(&client->mutex) {
+        if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
+                            &task) != 0) {
+            return -ENOMEM;
+        }
 
-    nfs_set_events(client);
-    qemu_mutex_unlock(&client->mutex);
+        nfs_set_events(client);
+    }
     while (!task.complete) {
         qemu_coroutine_yield();
     }

cpus-common.c

@@ -22,6 +22,7 @@
 #include "exec/cpu-common.h"
 #include "hw/core/cpu.h"
 #include "sysemu/cpus.h"
+#include "qemu/lockable.h"
 
 static QemuMutex qemu_cpu_list_lock;
 static QemuCond exclusive_cond;
@@ -71,7 +72,7 @@ static int cpu_get_free_index(void)
 
 void cpu_list_add(CPUState *cpu)
 {
-    qemu_mutex_lock(&qemu_cpu_list_lock);
+    QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
     if (cpu->cpu_index == UNASSIGNED_CPU_INDEX) {
         cpu->cpu_index = cpu_get_free_index();
         assert(cpu->cpu_index != UNASSIGNED_CPU_INDEX);
@@ -79,15 +80,13 @@ void cpu_list_add(CPUState *cpu)
         assert(!cpu_index_auto_assigned);
     }
     QTAILQ_INSERT_TAIL_RCU(&cpus, cpu, node);
-    qemu_mutex_unlock(&qemu_cpu_list_lock);
 }
 
 void cpu_list_remove(CPUState *cpu)
 {
-    qemu_mutex_lock(&qemu_cpu_list_lock);
+    QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
     if (!QTAILQ_IN_USE(cpu, node)) {
         /* there is nothing to undo since cpu_exec_init() hasn't been called */
-        qemu_mutex_unlock(&qemu_cpu_list_lock);
         return;
     }
 
@@ -95,7 +94,6 @@ void cpu_list_remove(CPUState *cpu)
 
     QTAILQ_REMOVE_RCU(&cpus, cpu, node);
     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
-    qemu_mutex_unlock(&qemu_cpu_list_lock);
 }
 
 struct qemu_work_item {
@@ -237,7 +235,7 @@ void cpu_exec_start(CPUState *cpu)
      * see cpu->running == true, and it will kick the CPU.
      */
     if (unlikely(atomic_read(&pending_cpus))) {
-        qemu_mutex_lock(&qemu_cpu_list_lock);
+        QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
         if (!cpu->has_waiter) {
             /* Not counted in pending_cpus, let the exclusive item
              * run.  Since we have the lock, just set cpu->running to true
@@ -252,7 +250,6 @@ void cpu_exec_start(CPUState *cpu)
              * waiter at cpu_exec_end.
              */
         }
-        qemu_mutex_unlock(&qemu_cpu_list_lock);
     }
 }
 
@@ -280,7 +277,7 @@ void cpu_exec_end(CPUState *cpu)
      * next cpu_exec_start.
      */
     if (unlikely(atomic_read(&pending_cpus))) {
-        qemu_mutex_lock(&qemu_cpu_list_lock);
+        QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
         if (cpu->has_waiter) {
             cpu->has_waiter = false;
             atomic_set(&pending_cpus, pending_cpus - 1);
@@ -288,7 +285,6 @@ void cpu_exec_end(CPUState *cpu)
                 qemu_cond_signal(&exclusive_cond);
             }
         }
-        qemu_mutex_unlock(&qemu_cpu_list_lock);
     }
 }
 

hw/display/qxl.c

@@ -478,18 +478,19 @@ static int qxl_track_command(PCIQXLDevice *qxl, struct QXLCommandExt *ext)
                               cmd->u.surface_create.stride);
             return 1;
         }
-        qemu_mutex_lock(&qxl->track_lock);
-        if (cmd->type == QXL_SURFACE_CMD_CREATE) {
-            qxl->guest_surfaces.cmds[id] = ext->cmd.data;
-            qxl->guest_surfaces.count++;
-            if (qxl->guest_surfaces.max < qxl->guest_surfaces.count)
-                qxl->guest_surfaces.max = qxl->guest_surfaces.count;
-        }
-        if (cmd->type == QXL_SURFACE_CMD_DESTROY) {
-            qxl->guest_surfaces.cmds[id] = 0;
-            qxl->guest_surfaces.count--;
+        WITH_QEMU_LOCK_GUARD(&qxl->track_lock) {
+            if (cmd->type == QXL_SURFACE_CMD_CREATE) {
+                qxl->guest_surfaces.cmds[id] = ext->cmd.data;
+                qxl->guest_surfaces.count++;
+                if (qxl->guest_surfaces.max < qxl->guest_surfaces.count) {
+                    qxl->guest_surfaces.max = qxl->guest_surfaces.count;
+                }
+            }
+            if (cmd->type == QXL_SURFACE_CMD_DESTROY) {
+                qxl->guest_surfaces.cmds[id] = 0;
+                qxl->guest_surfaces.count--;
+            }
         }
-        qemu_mutex_unlock(&qxl->track_lock);
         break;
     }
     case QXL_CMD_CURSOR:
@@ -958,10 +959,9 @@ static void interface_update_area_complete(QXLInstance *sin,
     int i;
     int qxl_i;
 
-    qemu_mutex_lock(&qxl->ssd.lock);
+    QEMU_LOCK_GUARD(&qxl->ssd.lock);
     if (surface_id != 0 || !num_updated_rects ||
         !qxl->render_update_cookie_num) {
-        qemu_mutex_unlock(&qxl->ssd.lock);
         return;
     }
     trace_qxl_interface_update_area_complete(qxl->id, surface_id, dirty->left,
@@ -980,7 +980,6 @@ static void interface_update_area_complete(QXLInstance *sin,
          * Don't bother copying or scheduling the bh since we will flip
          * the whole area anyway on completion of the update_area async call
          */
-        qemu_mutex_unlock(&qxl->ssd.lock);
         return;
     }
     qxl_i = qxl->num_dirty_rects;
@@ -991,7 +990,6 @@ static void interface_update_area_complete(QXLInstance *sin,
     trace_qxl_interface_update_area_complete_schedule_bh(qxl->id,
                                                          qxl->num_dirty_rects);
     qemu_bh_schedule(qxl->update_area_bh);
-    qemu_mutex_unlock(&qxl->ssd.lock);
 }
 
 /* called from spice server thread context only */
@@ -1694,15 +1692,14 @@ static void ioport_write(void *opaque, hwaddr addr,
     case QXL_IO_MONITORS_CONFIG_ASYNC:
 async_common:
         async = QXL_ASYNC;
-        qemu_mutex_lock(&d->async_lock);
-        if (d->current_async != QXL_UNDEFINED_IO) {
-            qxl_set_guest_bug(d, "%d async started before last (%d) complete",
-                io_port, d->current_async);
-            qemu_mutex_unlock(&d->async_lock);
-            return;
+        WITH_QEMU_LOCK_GUARD(&d->async_lock) {
+            if (d->current_async != QXL_UNDEFINED_IO) {
+                qxl_set_guest_bug(d, "%d async started before last (%d) complete",
+                    io_port, d->current_async);
+                return;
+            }
+            d->current_async = orig_io_port;
         }
-        d->current_async = orig_io_port;
-        qemu_mutex_unlock(&d->async_lock);
         break;
     default:
         break;

hw/vfio/platform.c

@@ -22,6 +22,7 @@
 #include "hw/vfio/vfio-platform.h"
 #include "migration/vmstate.h"
 #include "qemu/error-report.h"
+#include "qemu/lockable.h"
 #include "qemu/main-loop.h"
 #include "qemu/module.h"
 #include "qemu/range.h"
@@ -216,7 +217,7 @@ static void vfio_intp_interrupt(VFIOINTp *intp)
     VFIOPlatformDevice *vdev = intp->vdev;
     bool delay_handling = false;
 
-    qemu_mutex_lock(&vdev->intp_mutex);
+    QEMU_LOCK_GUARD(&vdev->intp_mutex);
     if (intp->state == VFIO_IRQ_INACTIVE) {
         QLIST_FOREACH(tmp, &vdev->intp_list, next) {
             if (tmp->state == VFIO_IRQ_ACTIVE ||
@@ -236,7 +237,6 @@ static void vfio_intp_interrupt(VFIOINTp *intp)
         QSIMPLEQ_INSERT_TAIL(&vdev->pending_intp_queue,
                              intp, pqnext);
         ret = event_notifier_test_and_clear(intp->interrupt);
-        qemu_mutex_unlock(&vdev->intp_mutex);
         return;
     }
 
@@ -266,7 +266,6 @@ static void vfio_intp_interrupt(VFIOINTp *intp)
                   qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
                       vdev->mmap_timeout);
     }
-    qemu_mutex_unlock(&vdev->intp_mutex);
 }
 
 /**

migration/migration.c

@@ -1653,11 +1653,10 @@ static void migrate_fd_cleanup_bh(void *opaque)
 
 void migrate_set_error(MigrationState *s, const Error *error)
 {
-    qemu_mutex_lock(&s->error_mutex);
+    QEMU_LOCK_GUARD(&s->error_mutex);
     if (!s->error) {
         s->error = error_copy(error);
     }
-    qemu_mutex_unlock(&s->error_mutex);
 }
 
 void migrate_fd_error(MigrationState *s, const Error *error)

migration/multifd.c

@@ -894,11 +894,11 @@ void multifd_recv_sync_main(void)
     for (i = 0; i < migrate_multifd_channels(); i++) {
         MultiFDRecvParams *p = &multifd_recv_state->params[i];
 
-        qemu_mutex_lock(&p->mutex);
-        if (multifd_recv_state->packet_num < p->packet_num) {
-            multifd_recv_state->packet_num = p->packet_num;
+        WITH_QEMU_LOCK_GUARD(&p->mutex) {
+            if (multifd_recv_state->packet_num < p->packet_num) {
+                multifd_recv_state->packet_num = p->packet_num;
+            }
         }
-        qemu_mutex_unlock(&p->mutex);
         trace_multifd_recv_sync_main_signal(p->id);
         qemu_sem_post(&p->sem_sync);
     }

migration/ram.c

@@ -1369,7 +1369,7 @@ static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset)
         return NULL;
     }
 
-    qemu_mutex_lock(&rs->src_page_req_mutex);
+    QEMU_LOCK_GUARD(&rs->src_page_req_mutex);
     if (!QSIMPLEQ_EMPTY(&rs->src_page_requests)) {
         struct RAMSrcPageRequest *entry =
                                 QSIMPLEQ_FIRST(&rs->src_page_requests);
@@ -1386,7 +1386,6 @@ static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset)
             migration_consume_urgent_request();
         }
     }
-    qemu_mutex_unlock(&rs->src_page_req_mutex);
 
     return block;
 }

monitor/misc.c

@@ -1473,7 +1473,7 @@ AddfdInfo *monitor_fdset_add_fd(int fd, bool has_fdset_id, int64_t fdset_id,
     MonFdsetFd *mon_fdset_fd;
     AddfdInfo *fdinfo;
 
-    qemu_mutex_lock(&mon_fdsets_lock);
+    QEMU_LOCK_GUARD(&mon_fdsets_lock);
     if (has_fdset_id) {
         QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
             /* Break if match found or match impossible due to ordering by ID */
@@ -1494,7 +1494,6 @@ AddfdInfo *monitor_fdset_add_fd(int fd, bool has_fdset_id, int64_t fdset_id,
             if (fdset_id < 0) {
                 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "fdset-id",
                            "a non-negative value");
-                qemu_mutex_unlock(&mon_fdsets_lock);
                 return NULL;
             }
             /* Use specified fdset ID */
@@ -1545,7 +1544,6 @@ AddfdInfo *monitor_fdset_add_fd(int fd, bool has_fdset_id, int64_t fdset_id,
     fdinfo->fdset_id = mon_fdset->id;
     fdinfo->fd = mon_fdset_fd->fd;
 
-    qemu_mutex_unlock(&mon_fdsets_lock);
     return fdinfo;
 }
 

ui/spice-display.c

@@ -18,6 +18,7 @@
 #include "qemu/osdep.h"
 #include "ui/qemu-spice.h"
 #include "qemu/timer.h"
+#include "qemu/lockable.h"
 #include "qemu/main-loop.h"
 #include "qemu/option.h"
 #include "qemu/queue.h"
@@ -483,12 +484,12 @@ void qemu_spice_display_refresh(SimpleSpiceDisplay *ssd)
 {
     graphic_hw_update(ssd->dcl.con);
 
-    qemu_mutex_lock(&ssd->lock);
-    if (QTAILQ_EMPTY(&ssd->updates) && ssd->ds) {
-        qemu_spice_create_update(ssd);
-        ssd->notify++;
+    WITH_QEMU_LOCK_GUARD(&ssd->lock) {
+        if (QTAILQ_EMPTY(&ssd->updates) && ssd->ds) {
+            qemu_spice_create_update(ssd);
+            ssd->notify++;
+        }
     }
-    qemu_mutex_unlock(&ssd->lock);
 
     trace_qemu_spice_display_refresh(ssd->qxl.id, ssd->notify);
     if (ssd->notify) {
@@ -580,7 +581,7 @@ static int interface_get_cursor_command(QXLInstance *sin, QXLCommandExt *ext)
     SimpleSpiceDisplay *ssd = container_of(sin, SimpleSpiceDisplay, qxl);
     int ret;
 
-    qemu_mutex_lock(&ssd->lock);
+    QEMU_LOCK_GUARD(&ssd->lock);
     if (ssd->ptr_define) {
         *ext = ssd->ptr_define->ext;
         ssd->ptr_define = NULL;
@@ -592,7 +593,6 @@ static int interface_get_cursor_command(QXLInstance *sin, QXLCommandExt *ext)
     } else {
         ret = false;
     }
-    qemu_mutex_unlock(&ssd->lock);
     return ret;
 }
 

util/log.c

@@ -25,6 +25,7 @@
 #include "qemu/cutils.h"
 #include "trace/control.h"
 #include "qemu/thread.h"
+#include "qemu/lockable.h"
 
 static char *logfilename;
 static QemuMutex qemu_logfile_mutex;
@@ -94,7 +95,7 @@ void qemu_set_log(int log_flags)
     if (qemu_loglevel && (!is_daemonized() || logfilename)) {
         need_to_open_file = true;
     }
-    qemu_mutex_lock(&qemu_logfile_mutex);
+    QEMU_LOCK_GUARD(&qemu_logfile_mutex);
     if (qemu_logfile && !need_to_open_file) {
         logfile = qemu_logfile;
         atomic_rcu_set(&qemu_logfile, NULL);
@@ -136,7 +137,6 @@ void qemu_set_log(int log_flags)
         }
         atomic_rcu_set(&qemu_logfile, logfile);
     }
-    qemu_mutex_unlock(&qemu_logfile_mutex);
 }
 
 void qemu_log_needs_buffers(void)

util/qemu-timer.c

@@ -459,17 +459,16 @@ void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time)
     QEMUTimerList *timer_list = ts->timer_list;
     bool rearm;
 
-    qemu_mutex_lock(&timer_list->active_timers_lock);
-    if (ts->expire_time == -1 || ts->expire_time > expire_time) {
-        if (ts->expire_time != -1) {
-            timer_del_locked(timer_list, ts);
+    WITH_QEMU_LOCK_GUARD(&timer_list->active_timers_lock) {
+        if (ts->expire_time == -1 || ts->expire_time > expire_time) {
+            if (ts->expire_time != -1) {
+                timer_del_locked(timer_list, ts);
+            }
+            rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
+        } else {
+            rearm = false;
         }
-        rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
-    } else {
-        rearm = false;
     }
-    qemu_mutex_unlock(&timer_list->active_timers_lock);
-
     if (rearm) {
         timerlist_rearm(timer_list);
     }

util/rcu.c

@@ -31,6 +31,7 @@
 #include "qemu/atomic.h"
 #include "qemu/thread.h"
 #include "qemu/main-loop.h"
+#include "qemu/lockable.h"
 #if defined(CONFIG_MALLOC_TRIM)
 #include <malloc.h>
 #endif
@@ -141,14 +142,14 @@ static void wait_for_readers(void)
 
 void synchronize_rcu(void)
 {
-    qemu_mutex_lock(&rcu_sync_lock);
+    QEMU_LOCK_GUARD(&rcu_sync_lock);
 
     /* Write RCU-protected pointers before reading p_rcu_reader->ctr.
      * Pairs with smp_mb_placeholder() in rcu_read_lock().
      */
     smp_mb_global();
 
-    qemu_mutex_lock(&rcu_registry_lock);
+    QEMU_LOCK_GUARD(&rcu_registry_lock);
     if (!QLIST_EMPTY(&registry)) {
         /* In either case, the atomic_mb_set below blocks stores that free
          * old RCU-protected pointers.
@@ -169,9 +170,6 @@ void synchronize_rcu(void)
 
         wait_for_readers();
     }
-
-    qemu_mutex_unlock(&rcu_registry_lock);
-    qemu_mutex_unlock(&rcu_sync_lock);
 }
 
 

util/thread-pool.c

@@ -210,7 +210,7 @@ static void thread_pool_cancel(BlockAIOCB *acb)
 
     trace_thread_pool_cancel(elem, elem->common.opaque);
 
-    qemu_mutex_lock(&pool->lock);
+    QEMU_LOCK_GUARD(&pool->lock);
     if (elem->state == THREAD_QUEUED &&
         /* No thread has yet started working on elem. we can try to "steal"
          * the item from the worker if we can get a signal from the
@@ -225,7 +225,6 @@ static void thread_pool_cancel(BlockAIOCB *acb)
         elem->ret = -ECANCELED;
     }
 
-    qemu_mutex_unlock(&pool->lock);
 }
 
 static AioContext *thread_pool_get_aio_context(BlockAIOCB *acb)

util/vfio-helpers.c

@@ -21,6 +21,7 @@
 #include "standard-headers/linux/pci_regs.h"
 #include "qemu/event_notifier.h"
 #include "qemu/vfio-helpers.h"
+#include "qemu/lockable.h"
 #include "trace.h"
 
 #define QEMU_VFIO_DEBUG 0
@@ -667,14 +668,12 @@ int qemu_vfio_dma_reset_temporary(QEMUVFIOState *s)
         .size = QEMU_VFIO_IOVA_MAX - s->high_water_mark,
     };
     trace_qemu_vfio_dma_reset_temporary(s);
-    qemu_mutex_lock(&s->lock);
+    QEMU_LOCK_GUARD(&s->lock);
     if (ioctl(s->container, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
         error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
-        qemu_mutex_unlock(&s->lock);
         return -errno;
     }
     s->high_water_mark = QEMU_VFIO_IOVA_MAX;
-    qemu_mutex_unlock(&s->lock);
     return 0;
 }