[PATCH v4 15/15] hw/nvme: Update the initalization place for the AER queue

[Lukasz Maniak]

From: Łukasz Gieryk <lukasz.gieryk@linux.intel.com>

This patch updates the initialization place for the AER queue, so it’s
initialized once, at controller initialization, and not every time
controller is enabled.

While the original version works for a non-SR-IOV device, as it’s hard
to interact with the controller if it’s not enabled, the multiple
reinitialization is not necessarily correct.

With the SR/IOV feature enabled a segfault can happen: a VF can have its
controller disabled, while a namespace can still be attached to the
controller through the parent PF. An event generated in such case ends
up on an uninitialized queue.

While it’s an interesting question whether a VF should support AER in
the first place, I don’t think it must be answered today.

Signed-off-by: Łukasz Gieryk <lukasz.gieryk@linux.intel.com>
---
 hw/nvme/ctrl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 624db2f9c6..b2228e960f 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -6029,8 +6029,6 @@ static int nvme_start_ctrl(NvmeCtrl *n)
 
     nvme_set_timestamp(n, 0ULL);
 
-    QTAILQ_INIT(&n->aer_queue);
-
     nvme_select_iocs(n);
 
     return 0;
@@ -7007,6 +7005,8 @@ static void nvme_init_ctrl(NvmeCtrl *n, PCIDevice 
*pci_dev)
         id->cmic |= NVME_CMIC_MULTI_CTRL;
     }
 
+    QTAILQ_INIT(&n->aer_queue);
+
     NVME_CAP_SET_MQES(cap, 0x7ff);
     NVME_CAP_SET_CQR(cap, 1);
     NVME_CAP_SET_TO(cap, 0xf);
-- 
2.25.1