[PATCH 1/5] firewire: ohci: use common macro to interpret be32 data in le32 buffer

[Takashi Sakamoto]

The 1394 OHCI driver configures the hardware to transfer the data quadlets
of packet via DMA after converting it to little endian, therefore the data
is typed as __le32. Nevertheless some actual hardware ignores the
configuration. In the case, the data in DMA buffer is aligned to big endian
(__be32).

For the case in big-endian machine, the driver includes the following
interpretation from __le32 to u32 (host-endian = __be32):

    * (__force __u32)(v)

In include/linux/byteorder/generic.h, be32_to_cpu() is available. It is
expanded to the following expression in
'include/uapi/linux/byteorder/big_endian.h':

    * (__force __u32)(__be32)(x)

This commit replace the ad-hoc endian interpretation with the above.

Signed-off-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
---
 drivers/firewire/ohci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index df16a8f4ee7f..a2d6d1d1ec2b 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -876,7 +876,7 @@ static void ar_sync_buffers_for_cpu(struct ar_context *ctx,
 
 #if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
 #define cond_le32_to_cpu(v) \
-	(ohci->quirks & QUIRK_BE_HEADERS ? (__force __u32)(v) : le32_to_cpu(v))
+	(ohci->quirks & QUIRK_BE_HEADERS ? be32_to_cpu(v) : le32_to_cpu(v))
 #else
 #define cond_le32_to_cpu(v) le32_to_cpu(v)
 #endif
-- 
2.43.0