[PATCH 20/78] virtio: make virtio_delete_queue idempotent

From: "Michael S. Tsirkin" <mst@redhat.com>

Let's make sure calling this twice is harmless -
no known instances, but seems safer.

Suggested-by: Pan Nengyuan <pannengyuan@huawei.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 8cd353ea0fbf0e334e015d833f612799be642296)
*prereq for 421afd2fe8
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/virtio/virtio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 31dd140990..6de3cfdc2c 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2337,6 +2337,7 @@ void virtio_delete_queue(VirtQueue *vq)
     vq->handle_output = NULL;
     vq->handle_aio_output = NULL;
     g_free(vq->used_elems);
+    vq->used_elems = NULL;
 }
 
 void virtio_del_queue(VirtIODevice *vdev, int n)
-- 
2.17.1

• [PATCH 01/78] block/nbd: extract the common cleanup code
• [PATCH 02/78] block/nbd: fix memory leak in nbd_open()
• [PATCH 03/78] i386: Resolve CPU models to v1 by default
• [PATCH 04/78] qapi: better document NVMe blockdev @device parameter
• [PATCH 05/78] target/arm: ensure we use current exception state after SCR update
• [PATCH 06/78] block: Activate recursively even for already active nodes
• [PATCH 07/78] virtio-blk: fix out-of-bounds access to bitmap in notify_guest_bh
• [PATCH 08/78] numa: remove not needed check
• [PATCH 09/78] numa: properly check if numa is supported
• [PATCH 10/78] backup-top: Begin drain earlier
• [PATCH 11/78] arm/arm-powerctl: set NSACR.{CP11, CP10} bits in arm_set_cpu_on()
• [PATCH 12/78] arm/arm-powerctl: rebuild hflags after setting CP15 bits in arm_set_cpu_on()
• [PATCH 13/78] hw/i386/pc: fix regression in parsing vga cmdline parameter
• [PATCH 14/78] tests/ide-test: Create a single unit-test covering more PRDT cases
• [PATCH 15/78] ide: Fix incorrect handling of some PRDTs in ide_dma_cb()
• [PATCH 16/78] target/arm: Set ISSIs16Bit in make_issinfo
• [PATCH 17/78] virtio: update queue size on guest write
• [PATCH 18/78] virtio-mmio: update queue size on guest write
• [PATCH 19/78] virtio: add ability to delete vq through a pointer
• [PATCH 20/78] virtio: make virtio_delete_queue idempotent
• [PATCH 21/78] virtio: reset region cache when on queue deletion
• [PATCH 22/78] virtio-net: delete also control queue when TX/RX deleted
• [PATCH 23/78] intel_iommu: a fix to vtd_find_as_from_bus_num()
• [PATCH 24/78] intel_iommu: add present bit check for pasid table entries
• [PATCH 25/78] vfio/pci: Don't remove irqchip notifier if not registered
• [PATCH 26/78] qcow2-bitmaps: fix qcow2_can_store_new_dirty_bitmap
• [PATCH 27/78] dp8393x: Mask EOL bit from descriptor addresses
• [PATCH 28/78] dp8393x: Always use 32-bit accesses
• [PATCH 29/78] dp8393x: Clean up endianness hacks
• [PATCH 30/78] dp8393x: Have dp8393x_receive() return the packet size
• [PATCH 31/78] dp8393x: Update LLFA and CRDA registers from rx descriptor
• [PATCH 32/78] dp8393x: Clear RRRA command register bit only when appropriate
• [PATCH 33/78] dp8393x: Implement packet size limit and RBAE interrupt
• [PATCH 34/78] dp8393x: Don't clobber packet checksum
• [PATCH 35/78] dp8393x: Use long-word-aligned RRA pointers in 32-bit mode
• [PATCH 36/78] dp8393x: Pad frames to word or long word boundary
• [PATCH 37/78] dp8393x: Clear descriptor in_use field to release packet
• [PATCH 38/78] dp8393x: Always update RRA pointers and sequence numbers
• [PATCH 39/78] dp8393x: Don't reset Silicon Revision register
• [PATCH 40/78] dp8393x: Don't stop reception upon RBE interrupt assertion
• [PATCH 41/78] s390/sclp: improve special wait psw logic
• [PATCH 42/78] plugins/core: add missing break in cb_to_tcg_flags
• [PATCH 43/78] tcg: save vaddr temp for plugin usage
• [PATCH 44/78] qcow2: update_refcount(): Reset old_table_index after qcow2_cache_put()
• [PATCH 45/78] qcow2: Fix qcow2_alloc_cluster_abort() for external data file
• [PATCH 46/78] iotests: Test copy offloading with external data file
• [PATCH 47/78] qcow2: Fix alloc_cluster_abort() for pre-existing clusters
• [PATCH 48/78] iotests/026: Test EIO on preallocated zero cluster
• [PATCH 49/78] iotests/026: Test EIO on allocation in a data-file
• [PATCH 50/78] virtio: gracefully handle invalid region caches
• [PATCH 51/78] scsi/qemu-pr-helper: Fix out-of-bounds access to trnptid_list[]
• [PATCH 52/78] block/qcow2-threads: fix qcow2_decompress
• [PATCH 53/78] job: refactor progress to separate object
• [PATCH 54/78] block/block-copy: fix progress calculation
• [PATCH 55/78] target/ppc: Fix rlwinm on ppc64
• [PATCH 56/78] block/io: fix bdrv_co_do_copy_on_readv
• [PATCH 57/78] compat: disable edid on correct virtio-gpu device
• [PATCH 58/78] qga: Installer: Wait for installation to finish
• [PATCH 59/78] qga-win: Handle VSS_E_PROVIDER_ALREADY_REGISTERED error
• [PATCH 60/78] qga-win: prevent crash when executing guest-file-read with large count
• [PATCH 61/78] qga: Fix undefined C behavior
• [PATCH 62/78] qemu-ga: document vsock-listen in the man page
• [PATCH 63/78] hw/i386/amd_iommu.c: Fix corruption of log events passed to guest
• [PATCH 64/78] tcg/i386: Fix INDEX_op_dup2_vec
• [PATCH 65/78] dump: Fix writing of ELF section
• [PATCH 66/78] xen-block: Fix double qlist remove and request leak
• [PATCH 67/78] vhost-user-gpu: Release memory returned by vu_queue_pop() with free()
• [PATCH 68/78] target/ppc: Fix mtmsr(d) L=1 variant that loses interrupts
• [PATCH 69/78] hostmem: don't use mbind() if host-nodes is empty
• [PATCH 70/78] target/arm: Clear tail in gvec_fmul_idx_*, gvec_fmla_idx_*
• [PATCH 71/78] qemu-nbd: Close inherited stderr
• [PATCH 72/78] 9p: Lock directory streams with a CoMutex
• [PATCH 73/78] net: Do not include a newline in the id of -nic devices
• [PATCH 74/78] nbd/server: Avoid long error message assertions CVE-2020-10761
• [PATCH 75/78] virtio-balloon: fix free page hinting without an iothread
• [PATCH 76/78] virtio-balloon: fix free page hinting check on unrealize
• [PATCH 77/78] virtio-balloon: unref the iothread when unrealizing
• [PATCH 78/78] block: Call attention to truncation of long NBD exports