| Message ID | 20170106200735.4210-3-grygorii.strashko@ti.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c index d6f0ded..a53b384 100644 --- a/drivers/net/ethernet/ti/davinci_cpdma.c +++ b/drivers/net/ethernet/ti/davinci_cpdma.c @@ -1159,7 +1159,7 @@ static int __cpdma_chan_process(struct cpdma_chan *chan) chan->count--; chan->stats.good_dequeue++; - if (status & CPDMA_DESC_EOQ) { + if ((status & CPDMA_DESC_EOQ) && chan->head) { chan->stats.requeue++; chan_write(chan, hdp, desc_phys(pool, chan->head)); }
The currently processing cpdma descriptor with EOQ flag set may contain two values in Next Descriptor Pointer field: - valid pointer: means CPDMA missed addition of new desc in queue; - null: no more descriptors in queue. In the later case, it's not required to write to HDP register, but now CPDMA does it. Hence, add additional check for Next Descriptor Pointer != null in cpdma_chan_process() function before writing in HDP register. Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> --- drivers/net/ethernet/ti/davinci_cpdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)