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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2009-10-14 20:40:10 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2009-10-31 11:40:51 +0100 |
| commit | 19593ffdb6daa6ba691d247a2400cece12687c52 (patch) | |
| tree | 18c3508bbdb5f2d1b1bf51ac653ec580043a9340 /drivers/firewire | |
| parent | 5b189bf3633c3b73d4f08124a86f3e019953d412 (diff) | |
| download | linux-stable-19593ffdb6daa6ba691d247a2400cece12687c52.tar.gz linux-stable-19593ffdb6daa6ba691d247a2400cece12687c52.tar.bz2 linux-stable-19593ffdb6daa6ba691d247a2400cece12687c52.zip | |
firewire: ohci: 0 may be a valid DMA address
I was told that there are obscure architectures with non-coherent DMA
which may DMA-map to bus address 0. We shall not use 0 as a magic
number of uninitialized bus address variables.
The packet->payload_length > 0 test cannot be used either (except in
at_context_queue_packet) because local requests are not DMA-mapped
regardless of payload_length. Hence add a state flag to struct
fw_packet.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/core-transaction.c | 4 | ||||
| -rw-r--r-- | drivers/firewire/ohci.c | 9 |
2 files changed, 7 insertions, 6 deletions
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c index 66789c3cc561..842739df23e2 100644 --- a/drivers/firewire/core-transaction.c +++ b/drivers/firewire/core-transaction.c @@ -226,7 +226,7 @@ static void fw_fill_request(struct fw_packet *packet, int tcode, int tlabel, packet->speed = speed; packet->generation = generation; packet->ack = 0; - packet->payload_bus = 0; + packet->payload_mapped = false; } /** @@ -601,7 +601,7 @@ void fw_fill_response(struct fw_packet *response, u32 *request_header, WARN(1, KERN_ERR "wrong tcode %d", tcode); } - response->payload_bus = 0; + response->payload_mapped = false; } EXPORT_SYMBOL(fw_fill_response); diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 418415564791..a71477541dc7 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -995,7 +995,8 @@ static int at_context_queue_packet(struct context *ctx, packet->ack = RCODE_SEND_ERROR; return -1; } - packet->payload_bus = payload_bus; + packet->payload_bus = payload_bus; + packet->payload_mapped = true; d[2].req_count = cpu_to_le16(packet->payload_length); d[2].data_address = cpu_to_le32(payload_bus); @@ -1023,7 +1024,7 @@ static int at_context_queue_packet(struct context *ctx, */ if (ohci->generation != packet->generation || reg_read(ohci, OHCI1394_IntEventSet) & OHCI1394_busReset) { - if (packet->payload_length > 0) + if (packet->payload_mapped) dma_unmap_single(ohci->card.device, payload_bus, packet->payload_length, DMA_TO_DEVICE); packet->ack = RCODE_GENERATION; @@ -1059,7 +1060,7 @@ static int handle_at_packet(struct context *context, /* This packet was cancelled, just continue. */ return 1; - if (packet->payload_bus) + if (packet->payload_mapped) dma_unmap_single(ohci->card.device, packet->payload_bus, packet->payload_length, DMA_TO_DEVICE); @@ -1723,7 +1724,7 @@ static int ohci_cancel_packet(struct fw_card *card, struct fw_packet *packet) if (packet->ack != 0) goto out; - if (packet->payload_bus) + if (packet->payload_mapped) dma_unmap_single(ohci->card.device, packet->payload_bus, packet->payload_length, DMA_TO_DEVICE); |