linux-kernel - [PATCH v2] firewire: Replace timeval with timespec64

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Date:	Thu, 22 Oct 2015 04:05:00 +0530
From:	Amitoj Kaur Chawla <amitoj1606@...il.com>
To:	outreachy-kernel@...glegroups.com
Cc:	stefanr@...6.in-berlin.de, linux1394-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] firewire: Replace timeval with timespec64

32 bit systems using 'struct timeval' will break in the year 2038, so
we replace the code appropriately. However, this driver is not broken
in 2038 since we are using only the microseconds portion of the
current time.

This patch replaces timeval with timespec64.

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>
---
Changes in v2:
        -Replaced timespec with timspec64
        -Modified commit message
        -Used ktime_get_real_ts64() instead of getnstimeofday64()

 drivers/firewire/nosy.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c
index 76b2d39..8a46077 100644
--- a/drivers/firewire/nosy.c
+++ b/drivers/firewire/nosy.c
@@ -33,6 +33,7 @@
 #include <linux/sched.h> /* required for linux/wait.h */
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/time64.h>
 #include <linux/timex.h>
 #include <linux/uaccess.h>
 #include <linux/wait.h>
@@ -413,17 +414,18 @@ static void
 packet_irq_handler(struct pcilynx *lynx)
 {
 	struct client *client;
-	u32 tcode_mask, tcode;
+	u32 tcode_mask, tcode, timestamp;
 	size_t length;
-	struct timeval tv;
+	struct timespec64 ts64;
 
 	/* FIXME: Also report rcv_speed. */
 
 	length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
 	tcode  = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
 
-	do_gettimeofday(&tv);
-	lynx->rcv_buffer[0] = (__force __le32)tv.tv_usec;
+	ktime_get_real_ts64(&ts64);
+	timestamp = ts64.tv_nsec / NSEC_PER_USEC;
+	lynx->rcv_buffer[0] = (__force __le32)timestamp;
 
 	if (length == PHY_PACKET_SIZE)
 		tcode_mask = 1 << TCODE_PHY_PACKET;
-- 
1.9.1

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