[PATCH] prism54: isl_38xx: Replace 'struct timeval'

[Tina Ruchandani]

'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 <ruchandani.t...@gmail.com>
---
 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 <linux/module.h>
 #include <linux/types.h>
 #include <linux/delay.h>
+#include <linux/ktime.h>

 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -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(&current_time);
+               ktime_get_real_ts64(&current_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(&current_time);
+                       ktime_get_real_ts64(&current_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(&current_time);
+                       ktime_get_real_ts64(&current_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(&current_time);
+               ktime_get_real_ts64(&current_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