commit 83d11973fa78be5bf0fd0e00791245e974fe4af3
author Stefan Hajnoczi <stefanha@redhat.com> Sat Feb 03 07:16:20 2018 +0100
committer Paolo Bonzini <pbonzini@redhat.com> Fri Jan 11 13:57:24 2019 +0100
tree 242507524d8d462a8c80ea6ddd048581fac7b7bb
parent f92fa85f982bb169c72e790ce07ffb12bda1a89c

block/iscsi: take iscsilun->mutex in iscsi_timed_check_events()

Commit d045c466d9e62b4321fadf586d024d54ddfd8bd4 ("iscsi: do not use
aio_context_acquire/release") introduced iscsilun->mutex but appears to
have overlooked iscsi_timed_check_events() when introducing the mutex.

iscsi_service() and iscsi_set_events() must be called with
iscsilun->mutex held.

iscsi_timed_check_events() is invoked from the AioContext and does not
take the mutex.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20180203061621.7033-3-stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

block/iscsi.c

diff --git a/block/iscsi.c b/block/iscsi.c
index a4e3730..1924a2b 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -344,6 +344,8 @@
 {
     IscsiLun *iscsilun = opaque;
 
+    qemu_mutex_lock(&iscsilun->mutex);
+
     /* check for timed out requests */
     iscsi_service(iscsilun->iscsi, 0);
 
@@ -356,6 +358,8 @@
      * to return to service once this situation changes. */
     iscsi_set_events(iscsilun);
 
+    qemu_mutex_unlock(&iscsilun->mutex);
+
     timer_mod(iscsilun->event_timer,
               qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
 }