From 18b46810eb61f1d1a66c5511d12e84ea8cb7f35c Mon Sep 17 00:00:00 2001 From: Alexandre TORGUE Date: Fri, 8 Apr 2016 11:18:03 +0200 Subject: [PATCH] net: ethernet: stmmac: GMAC4.xx: Fix TX descriptor preparation On GMAC4.xx each descriptor contains 2 buffers of 16KB (each). Initially, those 2 buffers was filled in dwmac4_rd_prepare_tx_desc but it is actually not needed. Indeed, stmmac driver supports frame up to 9000 bytes (jumbo). So only one buffer is needed. Reported-by: Dan Carpenter Signed-off-by: Alexandre TORGUE Signed-off-by: David S. Miller --- drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c index d4952c7a836d..4ec7397e7fb3 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c @@ -254,14 +254,7 @@ static void dwmac4_rd_prepare_tx_desc(struct dma_desc *p, int is_fs, int len, { unsigned int tdes3 = p->des3; - if (unlikely(len > BUF_SIZE_16KiB)) { - p->des2 |= (((len - BUF_SIZE_16KiB) << - TDES2_BUFFER2_SIZE_MASK_SHIFT) - & TDES2_BUFFER2_SIZE_MASK) - | (BUF_SIZE_16KiB & TDES2_BUFFER1_SIZE_MASK); - } else { - p->des2 |= (len & TDES2_BUFFER1_SIZE_MASK); - } + p->des2 |= (len & TDES2_BUFFER1_SIZE_MASK); if (is_fs) tdes3 |= TDES3_FIRST_DESCRIPTOR; -- 2.20.1