net: hamradio: baycom_ser_fdx: 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 only using microseconds portion of the time.

This patch replaces 'struct timeval' with 'struct timespec64'. We only
need to find elapsed microseconds rather than absolute time, so it's
better to use monotonic time, so using ktime_get_ts64() makes the code
more efficient and more robust against concurrent settimeofday()
calls.

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Thomas Sailer <t.sailer@alumni.ethz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/hamradio/baycom_ser_fdx.c b/drivers/net/hamradio/baycom_ser_fdx.c
index 636b65c66d49e6568b1e8535e66fac5b9a8dbd49..7b916d5b14b93c3db87399d747071a915256379d 100644 (file)
--- a/drivers/net/hamradio/baycom_ser_fdx.c
+++ b/drivers/net/hamradio/baycom_ser_fdx.c
@@ -80,6 +80,7 @@
 #include <linux/hdlcdrv.h>
 #include <linux/baycom.h>
 #include <linux/jiffies.h>
+#include <linux/time64.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -228,14 +229,15 @@ static inline unsigned int hweight8(unsigned int w)
 
 /* --------------------------------------------------------------------- */
 
-static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timeval *tv, unsigned char curs)
+static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timespec64 *ts, unsigned char curs)
 {
        int timediff;
        int bdus8 = bc->baud_us >> 3;
        int bdus4 = bc->baud_us >> 2;
        int bdus2 = bc->baud_us >> 1;
 
-       timediff = 1000000 + tv->tv_usec - bc->modem.ser12.pll_time;
+       timediff = 1000000 + ts->tv_nsec / NSEC_PER_USEC -
+                                       bc->modem.ser12.pll_time;
        while (timediff >= 500000)
                timediff -= 1000000;
        while (timediff >= bdus2) {
@@ -287,7 +289,7 @@ static irqreturn_t ser12_interrupt(int irq, void *dev_id)
 {
        struct net_device *dev = (struct net_device *)dev_id;
        struct baycom_state *bc = netdev_priv(dev);
-       struct timeval tv;
+       struct timespec64 ts;
        unsigned char iir, msr;
        unsigned int txcount = 0;
 
@@ -297,7 +299,7 @@ static irqreturn_t ser12_interrupt(int irq, void *dev_id)
        if ((iir = inb(IIR(dev->base_addr))) & 1)       
                return IRQ_NONE;
        /* get current time */
-       do_gettimeofday(&tv);
+       ktime_get_ts64(&ts);
        msr = inb(MSR(dev->base_addr));
        /* delta DCD */
        if ((msr & 8) && bc->opt_dcd)
@@ -340,7 +342,7 @@ static irqreturn_t ser12_interrupt(int irq, void *dev_id)
                }
                iir = inb(IIR(dev->base_addr));
        } while (!(iir & 1));
-       ser12_rx(dev, bc, &tv, msr & 0x10); /* CTS */
+       ser12_rx(dev, bc, &ts, msr & 0x10); /* CTS */
        if (bc->modem.ptt && txcount) {
                if (bc->modem.ser12.txshreg <= 1) {
                        bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);