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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2006-09-07 20:36:00 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2006-09-17 19:39:01 +0200 |
| commit | 9531f13ae56b136d0ad09e6e5c8308a7dc58f3f0 (patch) | |
| tree | f4f3f0348abd5ca2fc5404d0418122d9191330fc | |
| parent | ieee1394: ohci1394: fix endianess bug in debug message (diff) | |
| download | linux-9531f13ae56b136d0ad09e6e5c8308a7dc58f3f0.tar.xz linux-9531f13ae56b136d0ad09e6e5c8308a7dc58f3f0.zip | |
ieee1394: ohci1394: more obvious endianess handling
Rename ohci1394's packet_swab to header_le32_to_cpu to better reflect
what it actually does. Also, define a constant array as 'const' and
check the array index properly.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
| -rw-r--r-- | drivers/ieee1394/ohci1394.c | 27 |
1 files changed, 13 insertions, 14 deletions
diff --git a/drivers/ieee1394/ohci1394.c b/drivers/ieee1394/ohci1394.c index 4622c99c12f2..8d92246bdc3b 100644 --- a/drivers/ieee1394/ohci1394.c +++ b/drivers/ieee1394/ohci1394.c @@ -181,36 +181,35 @@ static int alloc_dma_trm_ctx(struct ti_ohci *ohci, struct dma_trm_ctx *d, static void ohci1394_pci_remove(struct pci_dev *pdev); #ifndef __LITTLE_ENDIAN -static unsigned hdr_sizes[] = -{ +const static size_t hdr_sizes[] = { 3, /* TCODE_WRITEQ */ 4, /* TCODE_WRITEB */ 3, /* TCODE_WRITE_RESPONSE */ - 0, /* ??? */ + 0, /* reserved */ 3, /* TCODE_READQ */ 4, /* TCODE_READB */ 3, /* TCODE_READQ_RESPONSE */ 4, /* TCODE_READB_RESPONSE */ - 1, /* TCODE_CYCLE_START (???) */ + 1, /* TCODE_CYCLE_START */ 4, /* TCODE_LOCK_REQUEST */ 2, /* TCODE_ISO_DATA */ 4, /* TCODE_LOCK_RESPONSE */ + /* rest is reserved or link-internal */ }; -/* Swap headers */ -static inline void packet_swab(quadlet_t *data, int tcode) +static inline void header_le32_to_cpu(quadlet_t *data, unsigned char tcode) { - size_t size = hdr_sizes[tcode]; + size_t size; - if (tcode > TCODE_LOCK_RESPONSE || hdr_sizes[tcode] == 0) + if (unlikely(tcode >= ARRAY_SIZE(hdr_sizes))) return; + size = hdr_sizes[tcode]; while (size--) - data[size] = swab32(data[size]); + data[size] = le32_to_cpu(data[size]); } #else -/* Don't waste cycles on same sex byte swaps */ -#define packet_swab(w,x) do {} while (0) +#define header_le32_to_cpu(w,x) do {} while (0) #endif /* !LITTLE_ENDIAN */ /*********************************** @@ -701,7 +700,7 @@ static void insert_packet(struct ti_ohci *ohci, d->prg_cpu[idx]->data[2] = packet->header[2]; d->prg_cpu[idx]->data[3] = packet->header[3]; } - packet_swab(d->prg_cpu[idx]->data, packet->tcode); + header_le32_to_cpu(d->prg_cpu[idx]->data, packet->tcode); } if (packet->data_size) { /* block transmit */ @@ -777,7 +776,7 @@ static void insert_packet(struct ti_ohci *ohci, d->prg_cpu[idx]->data[0] = packet->speed_code<<16 | (packet->header[0] & 0xFFFF); d->prg_cpu[idx]->data[1] = packet->header[0] & 0xFFFF0000; - packet_swab(d->prg_cpu[idx]->data, packet->tcode); + header_le32_to_cpu(d->prg_cpu[idx]->data, packet->tcode); d->prg_cpu[idx]->begin.control = cpu_to_le32(DMA_CTL_OUTPUT_MORE | @@ -2731,7 +2730,7 @@ static void dma_rcv_tasklet (unsigned long data) * bus reset. We always ignore it. */ if (tcode != OHCI1394_TCODE_PHY) { if (!ohci->no_swap_incoming) - packet_swab(d->spb, tcode); + header_le32_to_cpu(d->spb, tcode); DBGMSG("Packet received from node" " %d ack=0x%02X spd=%d tcode=0x%X" " length=%d ctx=%d tlabel=%d", |