The sysfs file for the libata error handling has multiple issues
in the way it prints time stamps:
* it prints a 9-digit nanosecond value using a %06lu format string,
which drops some leading zeroes
* it converts a 64-bit jiffes value to a timespec using
jiffies_to_timespec(), which takes a 'long' argument, so the
result is wrong after a jiffies overflow (49 days).
* we try to avoid using timespec because that generally overflows
in 2038, although this particular usage is ok.
This replaces the jiffies_to_timespec call with an open-coded
implementation that gets it right.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
drivers/ata/libata-transport.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c
index e2d94972962d..7ef16c085058 100644
--- a/drivers/ata/libata-transport.c
+++ b/drivers/ata/libata-transport.c
@@ -495,12 +495,13 @@ struct ata_show_ering_arg {
static int ata_show_ering(struct ata_ering_entry *ent, void *void_arg)
{
struct ata_show_ering_arg* arg = void_arg;
- struct timespec time;
+ u64 seconds;
+ u32 rem;
- jiffies_to_timespec(ent->timestamp,&time);
+ seconds = div_u64_rem(ent->timestamp, HZ, &rem);
arg->written += sprintf(arg->buf + arg->written,
- "[%5lu.%06lu]",
- time.tv_sec, time.tv_nsec);
+ "[%5llu.%09lu]", seconds,
+ rem * NSEC_PER_SEC / HZ);
arg->written += get_ata_err_names(ent->err_mask,
arg->buf + arg->written);
return 0;
--
2.9.0
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