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| author | Ian Abbott <abbotti@mev.co.uk> | 2019-08-12 13:08:14 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-25 10:51:48 +0200 |
| commit | d49423187a6e4639948f1db23ed76e64165a92a0 (patch) | |
| tree | 94b195d8d4a8ad49929cdce3b02ac19b7573e70d | |
| parent | 23a9fc5c5fcd822f8885047ea90cd9a59aef7bc0 (diff) | |
| download | linux-stable-d49423187a6e4639948f1db23ed76e64165a92a0.tar.gz linux-stable-d49423187a6e4639948f1db23ed76e64165a92a0.tar.bz2 linux-stable-d49423187a6e4639948f1db23ed76e64165a92a0.zip | |
staging: comedi: dt3000: Fix rounding up of timer divisor
commit 8e2a589a3fc36ce858d42e767c3bcd8fc62a512b upstream.
`dt3k_ns_to_timer()` determines the prescaler and divisor to use to
produce a desired timing period. It is influenced by a rounding mode
and can round the divisor up, down, or to the nearest value. However,
the code for rounding up currently does the same as rounding down! Fix
ir by using the `DIV_ROUND_UP()` macro to calculate the divisor when
rounding up.
Also, change the types of the `divider`, `base` and `prescale` variables
from `int` to `unsigned int` to avoid mixing signed and unsigned types
in the calculations.
Also fix a typo in a nearby comment: "improvment" => "improvement".
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20190812120814.21188-1-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/comedi/drivers/dt3000.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/staging/comedi/drivers/dt3000.c b/drivers/staging/comedi/drivers/dt3000.c index 6840b1ab620b..917d13abef88 100644 --- a/drivers/staging/comedi/drivers/dt3000.c +++ b/drivers/staging/comedi/drivers/dt3000.c @@ -351,9 +351,9 @@ static irqreturn_t dt3k_interrupt(int irq, void *d) static int dt3k_ns_to_timer(unsigned int timer_base, unsigned int *nanosec, unsigned int flags) { - int divider, base, prescale; + unsigned int divider, base, prescale; - /* This function needs improvment */ + /* This function needs improvement */ /* Don't know if divider==0 works. */ for (prescale = 0; prescale < 16; prescale++) { @@ -367,7 +367,7 @@ static int dt3k_ns_to_timer(unsigned int timer_base, unsigned int *nanosec, divider = (*nanosec) / base; break; case CMDF_ROUND_UP: - divider = (*nanosec) / base; + divider = DIV_ROUND_UP(*nanosec, base); break; } if (divider < 65536) { |