qcacmn: Use atomic allocation for all scheduler context scan allocations

In low memory environments using GFP_KERNEL flag may cause
scheduler thread to sleep. Scheduler thread callback handlers
are expected to be atomic in nature to ensure timely execution
of different commands. Move all allocations done by scan module
in scheduler thread context to atomic allocation.

Change-Id: Iee3eafbc00a3afea0687ba67b3041ec0816094cc
CRs-Fixed: 2232553

qdf/inc/qdf_mem.h

@@ -93,6 +93,7 @@ void qdf_mem_exit(void);
  * @file: File name of the call site
  * @line: Line number of the call site
  * @caller: Address of the caller function
+ * @flag: GFP flag
  *
  * This function will dynamicallly allocate the specified number of bytes of
  * memory and add it to the qdf tracking list to check for memory leaks and
@@ -101,11 +102,13 @@ void qdf_mem_exit(void);
  * Return: A valid memory location on success, or NULL on failure
  */
 void *qdf_mem_malloc_debug(size_t size, const char *file, uint32_t line,
-			   void *caller);
+			   void *caller, uint32_t flag);
 
 #define qdf_mem_malloc(size) \
-	qdf_mem_malloc_debug(size, __FILE__, __LINE__, QDF_RET_IP)
+	qdf_mem_malloc_debug(size, __FILE__, __LINE__, QDF_RET_IP, 0)
 
+#define qdf_mem_malloc_atomic(size) \
+	qdf_mem_malloc_debug(size, __FILE__, __LINE__, QDF_RET_IP, GFP_ATOMIC)
 /**
  * qdf_mem_free_debug() - debug version of qdf_mem_free
  * @ptr: Pointer to the starting address of the memory to be freed.
@@ -196,6 +199,7 @@ void qdf_mem_free_consistent_debug(qdf_device_t osdev, void *dev,
 				  __FILE__, __LINE__)
 #else
 void *qdf_mem_malloc(qdf_size_t size);
+void *qdf_mem_malloc_atomic(qdf_size_t size);
 
 /**
  * qdf_mem_free() - free QDF memory