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Commit 13173f0f authored by Suraj Jaiswal's avatar Suraj Jaiswal Committed by Gerrit - the friendly Code Review server
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net: stmmac: Fix overflow in sub second increment 



Fix overflow in sub second increment.

Change-Id: I6db62d9f04de0937457b194904ebb5191bbd838a
Signed-off-by: default avatarSuraj Jaiswal <jsuraj@codeaurora.org>
parent e1e04827

drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c

+6 −6
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ static void config_sub_second_increment(void __iomem *ioaddr, 
		u32 ptp_clock, int gmac4, u32 *ssinc)

{

	u32 value = readl(ioaddr + PTP_TCR);

	unsigned long ss_inc = 0, sns_inc = 0, ptpclock = 0;

	u64 ss_inc = 0, sns_inc = 0, ptpclock = 0;

	u32 reg_value;



	/* For GMAC3.x, 4.x versions, in "fine adjustement mode" set sub-second
@@ -35,19 +35,19 @@ static void config_sub_second_increment(void __iomem *ioaddr, 
	 * 2000000000ULL / ptp_clock.

	 */

	if (value & PTP_TCR_TSCFUPDT)

		ptpclock = (unsigned long)ptp_clock;

		ptpclock = (u64)ptp_clock;

	else

		ptpclock = (unsigned long)ptp_clock;

		ptpclock = (u64)ptp_clock;



	ss_inc = ((1 * 1000000000ULL) / ptpclock);

	ss_inc = div_u64((1 * 1000000000ULL), ptpclock);

	sns_inc = 1000000000ULL - (ss_inc * ptpclock); //take remainder



	//sns_inc needs to be multiplied by 2^8, per spec.

	sns_inc = (sns_inc * 256) / ptpclock;

	sns_inc = div_u64((sns_inc * 256), ptpclock);



	/* 0.465ns accuracy */

	if (!(value & PTP_TCR_TSCTRLSSR))

		ss_inc = (ss_inc * 1000) / 465;

		ss_inc = div_u64((ss_inc * 1000), 465);



	ss_inc &= PTP_SSIR_SSINC_MASK;

	sns_inc &= PTP_SSIR_SNSINC_MASK;