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);