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Message-Id: <1420689692-8760-7-git-send-email-zhang.chunyan@linaro.org>
Date: Thu, 8 Jan 2015 12:01:32 +0800
From: Chunyan Zhang <zhang.chunyan@...aro.org>
To: samuel@...tiz.org
Cc: arnd@...db.de, zhang.lyra@...il.com, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 6/6] irda: vlsi_ir: Replace timeval with ktime_t
The vlsi ir driver uses 'timeval', which we try to remove in the kernel
because all 32-bit time types will break in the year 2038.
This patch also changes do_gettimeofday() to ktime_get() accordingly,
since ktime_get returns a ktime_t, but do_gettimeofday returns a
struct timeval, and the other reason is that ktime_get() uses
the monotonic clock.
This patch uses ktime_us_delta to get the elapsed time of microsecond,
and uses div_s64_rem to get what seconds & microseconds time elapsed
for printing.
This patch also changes the function 'vlsi_hard_start_xmit' to do the
same things as the others drivers, that is passing the remaining time
into udelay() instead of looping until enough time has passed.
Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
Reviewed-by: Arnd Bergmann <arnd@...db.de>
---
drivers/net/irda/vlsi_ir.c | 46 +++++++++++++-------------------------------
drivers/net/irda/vlsi_ir.h | 2 +-
2 files changed, 14 insertions(+), 34 deletions(-)
diff --git a/drivers/net/irda/vlsi_ir.c b/drivers/net/irda/vlsi_ir.c
index ac39d9f..a0849f4 100644
--- a/drivers/net/irda/vlsi_ir.c
+++ b/drivers/net/irda/vlsi_ir.c
@@ -33,6 +33,7 @@ MODULE_LICENSE("GPL");
/********************************************************/
#include <linux/kernel.h>
+#include <linux/ktime.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
@@ -40,9 +41,9 @@ MODULE_LICENSE("GPL");
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
-#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#include <linux/math64.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
@@ -180,8 +181,7 @@ static void vlsi_proc_ndev(struct seq_file *seq, struct net_device *ndev)
vlsi_irda_dev_t *idev = netdev_priv(ndev);
u8 byte;
u16 word;
- unsigned delta1, delta2;
- struct timeval now;
+ s32 sec, usec;
unsigned iobase = ndev->base_addr;
seq_printf(seq, "\n%s link state: %s / %s / %s / %s\n", ndev->name,
@@ -277,17 +277,9 @@ static void vlsi_proc_ndev(struct seq_file *seq, struct net_device *ndev)
seq_printf(seq, "\nsw-state:\n");
seq_printf(seq, "IrPHY setup: %d baud - %s encoding\n", idev->baud,
(idev->mode==IFF_SIR)?"SIR":((idev->mode==IFF_MIR)?"MIR":"FIR"));
- do_gettimeofday(&now);
- if (now.tv_usec >= idev->last_rx.tv_usec) {
- delta2 = now.tv_usec - idev->last_rx.tv_usec;
- delta1 = 0;
- }
- else {
- delta2 = 1000000 + now.tv_usec - idev->last_rx.tv_usec;
- delta1 = 1;
- }
- seq_printf(seq, "last rx: %lu.%06u sec\n",
- now.tv_sec - idev->last_rx.tv_sec - delta1, delta2);
+ sec = div_s64_rem(ktime_us_delta(ktime_get(), idev->last_rx),
+ USEC_PER_SEC, &usec);
+ seq_printf(seq, "last rx: %ul.%06u sec\n", sec, usec);
seq_printf(seq, "RX: packets=%lu / bytes=%lu / errors=%lu / dropped=%lu",
ndev->stats.rx_packets, ndev->stats.rx_bytes, ndev->stats.rx_errors,
@@ -661,7 +653,7 @@ static void vlsi_rx_interrupt(struct net_device *ndev)
}
}
- do_gettimeofday(&idev->last_rx); /* remember "now" for later mtt delay */
+ idev->last_rx = ktime_get(); /* remember "now" for later mtt delay */
vlsi_fill_rx(r);
@@ -858,9 +850,8 @@ static netdev_tx_t vlsi_hard_start_xmit(struct sk_buff *skb,
unsigned iobase = ndev->base_addr;
u8 status;
u16 config;
- int mtt;
+ int mtt, diff;
int len, speed;
- struct timeval now, ready;
char *msg = NULL;
speed = irda_get_next_speed(skb);
@@ -940,21 +931,10 @@ static netdev_tx_t vlsi_hard_start_xmit(struct sk_buff *skb,
spin_unlock_irqrestore(&idev->lock, flags);
if ((mtt = irda_get_mtt(skb)) > 0) {
-
- ready.tv_usec = idev->last_rx.tv_usec + mtt;
- ready.tv_sec = idev->last_rx.tv_sec;
- if (ready.tv_usec >= 1000000) {
- ready.tv_usec -= 1000000;
- ready.tv_sec++; /* IrLAP 1.1: mtt always < 1 sec */
- }
- for(;;) {
- do_gettimeofday(&now);
- if (now.tv_sec > ready.tv_sec ||
- (now.tv_sec==ready.tv_sec && now.tv_usec>=ready.tv_usec))
- break;
- udelay(100);
+ diff = ktime_us_delta(ktime_get(), idev->last_rx);
+ if (mtt > diff)
+ udelay(mtt - diff);
/* must not sleep here - called under netif_tx_lock! */
- }
}
/* tx buffer already owned by CPU due to pci_dma_sync_single_for_cpu()
@@ -1333,7 +1313,7 @@ static int vlsi_start_hw(vlsi_irda_dev_t *idev)
vlsi_fill_rx(idev->rx_ring);
- do_gettimeofday(&idev->last_rx); /* first mtt may start from now on */
+ idev->last_rx = ktime_get(); /* first mtt may start from now on */
outw(0, iobase+VLSI_PIO_PROMPT); /* kick hw state machine */
@@ -1520,7 +1500,7 @@ static int vlsi_open(struct net_device *ndev)
if (!idev->irlap)
goto errout_free_ring;
- do_gettimeofday(&idev->last_rx); /* first mtt may start from now on */
+ idev->last_rx = ktime_get(); /* first mtt may start from now on */
idev->new_baud = 9600; /* start with IrPHY using 9600(SIR) mode */
diff --git a/drivers/net/irda/vlsi_ir.h b/drivers/net/irda/vlsi_ir.h
index f9119c6..f9db2ce 100644
--- a/drivers/net/irda/vlsi_ir.h
+++ b/drivers/net/irda/vlsi_ir.h
@@ -723,7 +723,7 @@ typedef struct vlsi_irda_dev {
void *virtaddr;
struct vlsi_ring *tx_ring, *rx_ring;
- struct timeval last_rx;
+ ktime_t last_rx;
spinlock_t lock;
struct mutex mtx;
--
1.7.9.5
--
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