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Date: Sun, 18 Oct 2015 17:44:19 +0800
From: WEN Pingbo <pingbo.wen@...aro.org>
To: dmitry.torokhov@...il.com, arnd@...db.de
Cc: linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
y2038@...ts.linaro.org, WEN Pingbo <pingbo.wen@...aro.org>
Subject: [PATCH] hp_sdc: fixed y2038 problem
Two replacements happened in this patch:
1. using timespec64 to prevent time overflow in 2038
2. using ktime_get_ts64 to avoid wall time issues(leap second, etc)
Signed-off-by: WEN Pingbo <pingbo.wen@...aro.org>
---
drivers/input/serio/hp_sdc.c | 18 +++++++++---------
include/linux/hp_sdc.h | 6 +++---
2 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/input/serio/hp_sdc.c b/drivers/input/serio/hp_sdc.c
index 852858e..76fb7fa 100644
--- a/drivers/input/serio/hp_sdc.c
+++ b/drivers/input/serio/hp_sdc.c
@@ -193,7 +193,7 @@ static void hp_sdc_take(int irq, void *dev_id, uint8_t status, uint8_t data)
curr->seq[curr->idx++] = status;
curr->seq[curr->idx++] = data;
hp_sdc.rqty -= 2;
- do_gettimeofday(&hp_sdc.rtv);
+ ktime_get_ts64(&hp_sdc.rtv);
if (hp_sdc.rqty <= 0) {
/* All data has been gathered. */
@@ -306,13 +306,13 @@ static void hp_sdc_tasklet(unsigned long foo)
write_lock_irq(&hp_sdc.rtq_lock);
if (hp_sdc.rcurr >= 0) {
- struct timeval tv;
+ struct timespec64 ts64;
- do_gettimeofday(&tv);
- if (tv.tv_sec > hp_sdc.rtv.tv_sec)
- tv.tv_usec += USEC_PER_SEC;
+ ktime_get_ts64(&ts64);
+ if (ts64.tv_sec > hp_sdc.rtv.tv_sec)
+ ts64.tv_nsec += NSEC_PER_SEC;
- if (tv.tv_usec - hp_sdc.rtv.tv_usec > HP_SDC_MAX_REG_DELAY) {
+ if (ts64.tv_nsec - hp_sdc.rtv.tv_nsec > HP_SDC_MAX_REG_DELAY) {
hp_sdc_transaction *curr;
uint8_t tmp;
@@ -321,8 +321,8 @@ static void hp_sdc_tasklet(unsigned long foo)
* we'll need to figure out a way to communicate
* it back to the application. and be less verbose.
*/
- printk(KERN_WARNING PREFIX "read timeout (%ius)!\n",
- (int)(tv.tv_usec - hp_sdc.rtv.tv_usec));
+ printk(KERN_WARNING PREFIX "read timeout (%llins)!\n",
+ (s64)(ts64.tv_nsec - hp_sdc.rtv.tv_nsec));
curr->idx += hp_sdc.rqty;
hp_sdc.rqty = 0;
tmp = curr->seq[curr->actidx];
@@ -551,7 +551,7 @@ unsigned long hp_sdc_put(void)
/* Start a new read */
hp_sdc.rqty = curr->seq[curr->idx];
- do_gettimeofday(&hp_sdc.rtv);
+ ktime_get_ts64(&hp_sdc.rtv);
curr->idx++;
/* Still need to lock here in case of spurious irq. */
write_lock_irq(&hp_sdc.rtq_lock);
diff --git a/include/linux/hp_sdc.h b/include/linux/hp_sdc.h
index d392975..1535640 100644
--- a/include/linux/hp_sdc.h
+++ b/include/linux/hp_sdc.h
@@ -47,9 +47,9 @@
#endif
-/* No 4X status reads take longer than this (in usec).
+/* No 4X status reads take longer than this (in nsec).
*/
-#define HP_SDC_MAX_REG_DELAY 20000
+#define HP_SDC_MAX_REG_DELAY 20000000
typedef void (hp_sdc_irqhook) (int irq, void *dev_id,
uint8_t status, uint8_t data);
@@ -281,7 +281,7 @@ typedef struct {
hp_sdc_transaction *tq[HP_SDC_QUEUE_LEN]; /* All pending read/writes */
int rcurr, rqty; /* Current read transact in process */
- struct timeval rtv; /* Time when current read started */
+ struct timespec64 rtv; /* Time when current read started */
int wcurr; /* Current write transact in process */
int dev_err; /* carries status from registration */
--
1.9.1
--
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