diff options
Diffstat (limited to 'drivers/firewire/ohci.c')
| -rw-r--r-- | drivers/firewire/ohci.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index ae4556f0c0c1..a61571c63c59 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -2218,8 +2218,14 @@ static int ohci_queue_iso_receive_dualbuffer(struct fw_iso_context *base, page = payload >> PAGE_SHIFT; offset = payload & ~PAGE_MASK; rest = p->payload_length; + /* + * The controllers I've tested have not worked correctly when + * second_req_count is zero. Rather than do something we know won't + * work, return an error + */ + if (rest == 0) + return -EINVAL; - /* FIXME: make packet-per-buffer/dual-buffer a context option */ while (rest > 0) { d = context_get_descriptors(&ctx->context, z + header_z, &d_bus); @@ -2271,7 +2277,7 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base, unsigned long payload) { struct iso_context *ctx = container_of(base, struct iso_context, base); - struct descriptor *d = NULL, *pd = NULL; + struct descriptor *d, *pd; struct fw_iso_packet *p = packet; dma_addr_t d_bus, page_bus; u32 z, header_z, rest; @@ -2309,8 +2315,9 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base, d->data_address = cpu_to_le32(d_bus + (z * sizeof(*d))); rest = payload_per_buffer; + pd = d; for (j = 1; j < z; j++) { - pd = d + j; + pd++; pd->control = cpu_to_le16(DESCRIPTOR_STATUS | DESCRIPTOR_INPUT_MORE); @@ -2462,7 +2469,10 @@ static int __devinit pci_probe(struct pci_dev *dev, } version = reg_read(ohci, OHCI1394_Version) & 0x00ff00ff; +#if 0 + /* FIXME: make it a context option or remove dual-buffer mode */ ohci->use_dualbuffer = version >= OHCI_VERSION_1_1; +#endif /* dual-buffer mode is broken if more than one IR context is active */ if (dev->vendor == PCI_VENDOR_ID_AGERE && |