From: Mark Lord Date: Sun, 30 Oct 2016 23:28:27 +0000 (-0400) Subject: r8152: Fix broken RX checksums. X-Git-Tag: v4.9-rc6~27^2~81 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b9a321b48af4;p=karo-tx-linux.git r8152: Fix broken RX checksums. The r8152 driver has been broken since (approx) 3.16.xx when support was added for hardware RX checksums on newer chip versions. Symptoms include random segfaults and silent data corruption over NFS. The hardware checksum logig does not work on the VER_02 dongles I have here when used with a slow embedded system CPU. Google reveals others reporting similar issues on Raspberry Pi. So, disable hardware RX checksum support for VER_02, and fix an obvious coding error for IPV6 checksums in the same function. Because this bug results in silent data corruption, it is a good candidate for back-porting to -stable >= 3.16.xx. Signed-off-by: Mark Lord Signed-off-by: David S. Miller --- diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c index 44d439f50961..75c516889645 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -1730,7 +1730,7 @@ static u8 r8152_rx_csum(struct r8152 *tp, struct rx_desc *rx_desc) u8 checksum = CHECKSUM_NONE; u32 opts2, opts3; - if (tp->version == RTL_VER_01) + if (tp->version == RTL_VER_01 || tp->version == RTL_VER_02) goto return_result; opts2 = le32_to_cpu(rx_desc->opts2); @@ -1745,7 +1745,7 @@ static u8 r8152_rx_csum(struct r8152 *tp, struct rx_desc *rx_desc) checksum = CHECKSUM_NONE; else checksum = CHECKSUM_UNNECESSARY; - } else if (RD_IPV6_CS) { + } else if (opts2 & RD_IPV6_CS) { if ((opts2 & RD_UDP_CS) && !(opts3 & UDPF)) checksum = CHECKSUM_UNNECESSARY; else if ((opts2 & RD_TCP_CS) && !(opts3 & TCPF))