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authorLinus Torvalds <torvalds@linux-foundation.org>2009-12-11 15:22:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-11 15:22:27 -0800
commit5f1141eb352ea79d849920039503e40dd623fffa (patch)
tree1378b88a847c483933334d5c3695138bfa6c5a4d /drivers/firewire
parent880188b2433c3af51fa006207d9b13c70d2e5938 (diff)
parent8c0c0cc2d9f4c523fde04bdfe41e4380dec8ee54 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: firewire: ohci: handle receive packets with a data length of zero
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/ohci.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index ae4556f0c0c1..96768e160866 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2218,6 +2218,13 @@ 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) {
@@ -2271,7 +2278,7 @@ 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 +2316,9 @@ 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);