lib: logic_pio: Enforce LOGIC_PIO_INDIRECT region ops are set at registration

Since the only LOGIC_PIO_INDIRECT host (hisi-lpc) now sets the ops prior
to registration, enforce this check for accessors ops at registration
instead of in the IO port accessors to simplify and marginally optimise
the code.

A slight misalignment is also tidied.

Also add myself as an author.
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

lib/logic_pio.c

@@ -3,6 +3,7 @@
  * Copyright (C) 2017 HiSilicon Limited, All Rights Reserved.
  * Author: Gabriele Paoloni <gabriele.paoloni@huawei.com>
  * Author: Zhichang Yuan <yuanzhichang@hisilicon.com>
+ * Author: John Garry <john.garry@huawei.com>
  */
 
 #define pr_fmt(fmt)	"LOGIC PIO: " fmt
@@ -39,7 +40,8 @@ int logic_pio_register_range(struct logic_pio_hwaddr *new_range)
 	resource_size_t iio_sz = MMIO_UPPER_LIMIT;
 	int ret = 0;
 
-	if (!new_range || !new_range->fwnode || !new_range->size)
+	if (!new_range || !new_range->fwnode || !new_range->size ||
+	    (new_range->flags == LOGIC_PIO_INDIRECT && !new_range->ops))
 		return -EINVAL;
 
 	start = new_range->hw_start;
@@ -237,7 +239,7 @@ type logic_in##bw(unsigned long addr)					\
 	} else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
 		struct logic_pio_hwaddr *entry = find_io_range(addr);	\
 									\
-		if (entry && entry->ops)				\
+		if (entry)						\
 			ret = entry->ops->in(entry->hostdata,		\
 					addr, sizeof(type));		\
 		else							\
@@ -253,7 +255,7 @@ void logic_out##bw(type value, unsigned long addr)			\
 	} else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) {	\
 		struct logic_pio_hwaddr *entry = find_io_range(addr);	\
 									\
-		if (entry && entry->ops)				\
+		if (entry)						\
 			entry->ops->out(entry->hostdata,		\
 					addr, value, sizeof(type));	\
 		else							\
@@ -269,7 +271,7 @@ void logic_ins##bw(unsigned long addr, void *buffer,		\
 	} else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) {	\
 		struct logic_pio_hwaddr *entry = find_io_range(addr);	\
 									\
-		if (entry && entry->ops)				\
+		if (entry)						\
 			entry->ops->ins(entry->hostdata,		\
 				addr, buffer, sizeof(type), count);	\
 		else							\
@@ -286,7 +288,7 @@ void logic_outs##bw(unsigned long addr, const void *buffer,		\
 	} else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) {	\
 		struct logic_pio_hwaddr *entry = find_io_range(addr);	\
 									\
-		if (entry && entry->ops)				\
+		if (entry)						\
 			entry->ops->outs(entry->hostdata,		\
 				addr, buffer, sizeof(type), count);	\
 		else							\