ACC: Bugfix of VA leak at wd_reserve_mem

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

[  867.662129] Call trace:
[  867.664565]  dump_backtrace+0x0/0x1c0
[  867.668213]  show_stack+0x24/0x30
[  867.671516]  dump_stack+0xa8/0xcc
[  867.674818]  oom_show_debug_info+0x20/0xe0
[  867.678900]  out_of_memory+0x1f0/0x520
[  867.682634]  __alloc_pages_nodemask+0xca8/0xd38
[  867.687151]  iommu_dma_alloc+0x178/0x428
[  867.691060]  __iommu_alloc_attrs+0x280/0x3f8
[  867.695318]  uacce_create_region+0x42c/0x5e8 [uacce]
[  867.700269]  uacce_fops_mmap+0x298/0x338 [uacce]
[  867.704871]  mmap_region+0x3e8/0x5b8
[  867.708432]  do_mmap+0x304/0x470
[  867.711646]  vm_mmap_pgoff+0xf4/0x128
[  867.715294]  ksys_mmap_pgoff+0xb4/0x258
[  867.719115]  __arm64_sys_mmap+0x34/0x48
[  867.722937]  el0_svc_common+0xa0/0x180
[  867.726672]  el0_svc_handler+0x38/0x78
[  867.730407]  el0_svc+0x8/0xc
[  867.742023] error, MEM_PrintAllMemory is NULL!
[  867.746455]
[  867.746455] slab info:
[  867.750287] slabinfo - version: 2.1

Add munmap as wd_release_queue in UACCE

Signed-off-by: xuzaibo <xuzaibo@huawei.com>
Reviewed-by: wangzhou <wangzhou1@hisilicon.com>
Signed-off-by: lingmingqiang <lingmingqiang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>

drivers/uacce/uacce.c

@@ -394,6 +394,9 @@ static void uacce_destroy_region(struct uacce_queue *q,
 		dev_dbg(uacce->pdev, "free dma qfr %s (kaddr=%lx, dma=%llx)\n",
 			uacce_qfrt_str(qfr), (unsigned long)qfr->kaddr,
 			qfr->dma);
+		if (current->mm)
+			vm_munmap((unsigned long)qfr->iova,
+				  qfr->nr_pages << PAGE_SHIFT);
 		dma_free_coherent(uacce->pdev, qfr->nr_pages << PAGE_SHIFT,
 				  qfr->kaddr, qfr->dma);
 	} else if (qfr->pages) {