qcacmn: Zero out the memory of hal shadow pointers

Currently hal shadow pointers after memory allocation
are not memset to zero. In case of SMMU S1 enable when
host starts to access hal srng the random value of shadow
memory is copied to host cached values which leads to accessing
the rings even when HW has not updated to it. So zero out
the memory of hal shadow ring pointers after memory allocation.

Change-Id: I10ac6bfff957e953ee9caa15056ce3fa9d57b70e
CRs-Fixed: 2368491

hal/wifi3.0/hal_srng.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -311,6 +311,8 @@ void *hal_attach(void *hif_handle, qdf_device_t qdf_dev)
 			__func__);
 		goto fail1;
 	}
+	qdf_mem_zero(hal->shadow_rdptr_mem_vaddr,
+		     sizeof(*(hal->shadow_rdptr_mem_vaddr)) * HAL_SRNG_ID_MAX);
 
 	hal->shadow_wrptr_mem_vaddr =
 		(uint32_t *)qdf_mem_alloc_consistent(qdf_dev, qdf_dev->dev,
@@ -322,6 +324,8 @@ void *hal_attach(void *hif_handle, qdf_device_t qdf_dev)
 			__func__);
 		goto fail2;
 	}
+	qdf_mem_zero(hal->shadow_wrptr_mem_vaddr,
+		sizeof(*(hal->shadow_wrptr_mem_vaddr)) * HAL_MAX_LMAC_RINGS);
 
 	for (i = 0; i < HAL_SRNG_ID_MAX; i++) {
 		hal->srng_list[i].initialized = 0;