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qcacmn: Protect rx execution context for wmi events

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wmi rx event context can be modified at runtime by
upper layers. Protect rx execution context for wmi events
to avoid race conditions.

Change-Id: I7eed7108d09f8f39432990b2ebfef29a41bfa9aa
CRs-Fixed: 983619
This commit is contained in:
Govind Singh
2016-03-12 09:26:52 +05:30
parent b53420c1bb
commit 813fdaca8c
1 changed files with 6 additions and 0 deletions
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6
wmi_unified.c
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@@ -967,7 +967,9 @@ int wmi_unified_register_event_handler(wmi_unified_t wmi_handle,
idx = wmi_handle->max_event_idx;
wmi_handle->event_handler[idx] = handler_func;
wmi_handle->event_id[idx] = event_id;
qdf_spin_lock_bh(&wmi_handle->ctx_lock);
wmi_handle->ctx[idx] = rx_ctx;
qdf_spin_unlock_bh(&wmi_handle->ctx_lock);
wmi_handle->max_event_idx++;
return 0;
@@ -1082,7 +1084,9 @@ void wmi_control_rx(void *ctx, HTC_PACKET *htc_packet)
qdf_nbuf_free(evt_buf);
return;
}
qdf_spin_lock_bh(&wmi_handle->ctx_lock);
exec_ctx = wmi_handle->ctx[idx];
qdf_spin_unlock_bh(&wmi_handle->ctx_lock);
if (exec_ctx == WMI_RX_WORK_CTX) {
wmi_process_fw_event_worker_thread_ctx
@@ -1282,6 +1286,7 @@ void *wmi_unified_attach(void *scn_handle,
/* Assign target cookie capablity */
wmi_handle->use_cookie = use_cookie;
wmi_handle->osdev = osdev;
qdf_spinlock_create(&wmi_handle->ctx_lock);
return wmi_handle;
}
@@ -1305,6 +1310,7 @@ void wmi_unified_detach(struct wmi_unified *wmi_handle)
buf = qdf_nbuf_queue_remove(&wmi_handle->event_queue);
}
qdf_spin_unlock_bh(&wmi_handle->eventq_lock);
qdf_spinlock_destroy(&wmi_handle->ctx_lock);
if (wmi_handle != NULL) {
OS_FREE(wmi_handle);
wmi_handle = NULL;