From: Russell King (Oracle) Date: Sat, 14 Mar 2026 09:42:55 +0000 (+0000) Subject: net: stmmac: remove rx_tail_addr X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bea37bda7f75c552e0ddddec2d04c3c7c6222208;p=thirdparty%2Fkernel%2Flinux.git net: stmmac: remove rx_tail_addr There is only one place where rx_q->rx_tail_addr is used - the new stmmac_set_queue_rx_tail_ptr(). Make this a local variable and remove it from struct stmmac_rx_queue. This commit does not change the semantics - the hardware relies upon the descriptor ring not crossing a 4GiB boundary as the high address bits are programmed into a separate register via stmmac_init_rx_chan(). Hence, truncating the DMA address to 32-bit is fine as the register it will be programmed into is 32-bit, and the high bits are handled elsewhere. Signed-off-by: Russell King (Oracle) Link: https://patch.msgid.link/E1w1LWJ-0000000DGSL-2jWd@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h index a2dc167adb6c2..2f24d5c584e6a 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h @@ -131,7 +131,6 @@ struct stmmac_rx_queue { unsigned int buf_alloc_num; unsigned int napi_skb_frag_size; dma_addr_t dma_rx_phy; - u32 rx_tail_addr; unsigned int state_saved; struct { struct sk_buff *skb; diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index d4129e9a0fb63..dafd3a3e98442 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -388,8 +388,9 @@ static void stmmac_set_queue_rx_tail_ptr(struct stmmac_priv *priv, * descriptiors are only supported with dwmac1000 (rx_tail_addr = rx_q->dma_rx_phy + index * sizeof(struct dma_desc); - stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_q->rx_tail_addr, chan); + u32 rx_tail_addr = rx_q->dma_rx_phy + index * sizeof(struct dma_desc); + + stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_tail_addr, chan); } /**