Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758564AbcCVJzi (ORCPT ); Tue, 22 Mar 2016 05:55:38 -0400 Received: from mail-ob0-f172.google.com ([209.85.214.172]:33681 "EHLO mail-ob0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754631AbcCVJz1 (ORCPT ); Tue, 22 Mar 2016 05:55:27 -0400 Date: Tue, 22 Mar 2016 02:55:22 -0700 From: Tina Ruchandani To: y2038@lists.linaro.org Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, arnd@arndb.de, linux-kernel@vger.kernel.org, Kalle Valo Subject: [PATCH] prism54: isl_38xx: Replace 'struct timeval' Message-ID: <20160322095522.GA35392@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4250 Lines: 103 'struct timeval' uses a 32-bit seconds field which will overflow in year 2038 and beyond. This patch is part of a larger effort to remove all instances of 'struct timeval' from the kernel and replace them with 64-bit timekeeping variables. The correctness of the code isn't affected by this patch - the seconds value being printed would earlier be wrong due to overflow in timeval, and now it gets truncated to 32-bit due to the 'long' cast used on tv.sec field to prevent compiler warnings. Truly fixing this would require changing the debug print to print more than 8 digits and using a different specifier from %li. The patch was build-tested / debugged by removing the "if VERBOSE > SHOW_ERROR_MESSAGES" guards. Signed-off-by: Tina Ruchandani --- drivers/net/wireless/intersil/prism54/isl_38xx.c | 29 +++++++++++++++--------- 1 file changed, 18 insertions(+), 11 deletions(-) diff --git a/drivers/net/wireless/intersil/prism54/isl_38xx.c b/drivers/net/wireless/intersil/prism54/isl_38xx.c index 333c1a2..e510375 100644 --- a/drivers/net/wireless/intersil/prism54/isl_38xx.c +++ b/drivers/net/wireless/intersil/prism54/isl_38xx.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include @@ -113,7 +114,7 @@ isl38xx_trigger_device(int asleep, void __iomem *device_base) #if VERBOSE > SHOW_ERROR_MESSAGES u32 counter = 0; - struct timeval current_time; + struct timespec64 current_ts64; DEBUG(SHOW_FUNCTION_CALLS, "isl38xx trigger device\n"); #endif @@ -121,22 +122,25 @@ isl38xx_trigger_device(int asleep, void __iomem *device_base) if (asleep) { /* device is in powersave, trigger the device for wakeup */ #if VERBOSE > SHOW_ERROR_MESSAGES - do_gettimeofday(¤t_time); + ktime_get_real_ts64(¤t_ts64); DEBUG(SHOW_TRACING, "%08li.%08li Device wakeup triggered\n", - current_time.tv_sec, (long)current_time.tv_usec); + (long)current_ts64.tv_sec, + (long)(current_ts64.tv_nsec / NSEC_PER_USEC)); DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n", - current_time.tv_sec, (long)current_time.tv_usec, + (long)current_ts64.tv_sec, + (long)(current_ts64.tv_nsec / NSEC_PER_USEC), readl(device_base + ISL38XX_CTRL_STAT_REG)); #endif reg = readl(device_base + ISL38XX_INT_IDENT_REG); if (reg == 0xabadface) { #if VERBOSE > SHOW_ERROR_MESSAGES - do_gettimeofday(¤t_time); + ktime_get_real_ts64(¤t_ts64); DEBUG(SHOW_TRACING, "%08li.%08li Device register abadface\n", - current_time.tv_sec, (long)current_time.tv_usec); + (long)current_ts64.tv_sec, + (long)(current_ts64.tv_nsec / NSEC_PER_USEC)); #endif /* read the Device Status Register until Sleepmode bit is set */ while (reg = readl(device_base + ISL38XX_CTRL_STAT_REG), @@ -150,12 +154,14 @@ isl38xx_trigger_device(int asleep, void __iomem *device_base) #if VERBOSE > SHOW_ERROR_MESSAGES DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n", - current_time.tv_sec, (long)current_time.tv_usec, + (long)current_ts64.tv_sec, + (long)(current_ts64.tv_nsec / NSEC_PER_USEC), readl(device_base + ISL38XX_CTRL_STAT_REG)); - do_gettimeofday(¤t_time); + ktime_get_real_ts64(¤t_ts64); DEBUG(SHOW_TRACING, "%08li.%08li Device asleep counter %i\n", - current_time.tv_sec, (long)current_time.tv_usec, + (long)current_ts64.tv_sec, + (long)(current_ts64.tv_nsec / NSEC_PER_USEC), counter); #endif } @@ -168,9 +174,10 @@ isl38xx_trigger_device(int asleep, void __iomem *device_base) /* perform another read on the Device Status Register */ reg = readl(device_base + ISL38XX_CTRL_STAT_REG); - do_gettimeofday(¤t_time); + ktime_get_real_ts64(¤t_ts64); DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n", - current_time.tv_sec, (long)current_time.tv_usec, reg); + (long)current_ts64.tv_sec, + (long)(current_ts64.tv_nsec / NSEC_PER_USEC), reg); #endif } else { /* device is (still) awake */ -- 2.8.0.rc3.226.g39d4020