iop-adma: use iop_paranoia() for debug BUG_ONs

Now that the critical read back to flush the next descriptor address is
fixed we can downgrade some BUG_ONs that need only be enabled when testing
changes to the driver.
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

arch/arm/include/asm/hardware/iop3xx-adma.h

@@ -730,7 +730,8 @@ static inline void iop_desc_set_next_desc(struct iop_adma_desc_slot *desc,
 {
 	/* hw_desc->next_desc is the same location for all channels */
 	union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
-	BUG_ON(hw_desc.dma->next_desc);
+
+	iop_paranoia(hw_desc.dma->next_desc);
 	hw_desc.dma->next_desc = next_desc_addr;
 }
 
@@ -760,7 +761,7 @@ static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc)
 	struct iop3xx_desc_aau *hw_desc = desc->hw_desc;
 	struct iop3xx_aau_desc_ctrl desc_ctrl = hw_desc->desc_ctrl_field;
 
-	BUG_ON(!(desc_ctrl.tx_complete && desc_ctrl.zero_result_en));
+	iop_paranoia(!(desc_ctrl.tx_complete && desc_ctrl.zero_result_en));
 	return desc_ctrl.zero_result_err;
 }
 

arch/arm/include/asm/hardware/iop_adma.h

@@ -23,6 +23,12 @@
 
 #define IOP_ADMA_SLOT_SIZE 32
 #define IOP_ADMA_THRESHOLD 4
+#ifdef DEBUG
+#define IOP_PARANOIA 1
+#else
+#define IOP_PARANOIA 0
+#endif
+#define iop_paranoia(x) BUG_ON(IOP_PARANOIA && (x))
 
 /**
  * struct iop_adma_device - internal representation of an ADMA device

arch/arm/mach-iop13xx/include/mach/adma.h

@@ -404,7 +404,8 @@ static inline void iop_desc_set_next_desc(struct iop_adma_desc_slot *desc,
 					u32 next_desc_addr)
 {
 	struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc;
-	BUG_ON(hw_desc->next_desc);
+
+	iop_paranoia(hw_desc->next_desc);
 	hw_desc->next_desc = next_desc_addr;
 }
 

drivers/dma/iop-adma.c

@@ -431,7 +431,7 @@ iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
 	BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */
 
 	/* check for pre-chained descriptors */
-	BUG_ON(iop_desc_get_next_desc(sw_desc));
+	iop_paranoia(iop_desc_get_next_desc(sw_desc));
 
 	/* increment the pending count by the number of slots
 	 * memcpy operations have a 1:1 (slot:operation) relation