The local variable "desc" was being used to read-modify-write the
first descriptor (of a multi-desc packet) upon packet completion.
desc however continues to be used by the code as the current
descriptor. Give this first desc RMW it's own local variable to
avoid trampling.
Signed-off-by: Peter Crosthwaite <peter.crosthwa...@xilinx.com>
---
hw/net/cadence_gem.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
index e34b25e..1c36e48 100644
--- a/hw/net/cadence_gem.c
+++ b/hw/net/cadence_gem.c
@@ -917,14 +917,16 @@ static void gem_transmit(GemState *s)
/* Last descriptor for this packet; hand the whole thing off */
if (tx_desc_get_last(desc)) {
+ unsigned desc_first[2];
+
/* Modify the 1st descriptor of this packet to be owned by
* the processor.
*/
cpu_physical_memory_read(s->tx_desc_addr,
- (uint8_t *)&desc[0], sizeof(desc));
- tx_desc_set_used(desc);
+ (uint8_t *)&desc_first[0], sizeof(desc));
+ tx_desc_set_used(desc_first);
cpu_physical_memory_write(s->tx_desc_addr,
- (uint8_t *)&desc[0], sizeof(desc));
+ (uint8_t *)&desc_first[0], sizeof(desc));
/* Advance the hardare current descriptor past this packet */
if (tx_desc_get_wrap(desc)) {
s->tx_desc_addr = s->regs[GEM_TXQBASE];
--
1.9.2.1.g06c4abd
