* [PATCH] USB: gtco: remove unnecessary variable assignments
@ 2017-06-15 1:50 Gustavo A. R. Silva
2017-06-15 5:00 ` Joe Perches
0 siblings, 1 reply; 3+ messages in thread
From: Gustavo A. R. Silva @ 2017-06-15 1:50 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: linux-input, linux-kernel, Gustavo A. R. Silva
Remove unnecessary variable assignments.
Variable _val_ is overwritten before the value stored in it can be used.
Addresses-Coverity-ID: 1397695
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
---
drivers/input/tablet/gtco.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c
index b796e89..d9de13c 100644
--- a/drivers/input/tablet/gtco.c
+++ b/drivers/input/tablet/gtco.c
@@ -652,8 +652,6 @@ static void gtco_urb_callback(struct urb *urbinfo)
switch (device->buffer[0]) {
case 5:
/* Pressure is 9 bits */
- val = ((u16)(device->buffer[8]) << 1);
- val |= (u16)(device->buffer[7] >> 7);
input_report_abs(inputdev, ABS_PRESSURE,
device->buffer[8]);
--
2.5.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] USB: gtco: remove unnecessary variable assignments
2017-06-15 1:50 [PATCH] USB: gtco: remove unnecessary variable assignments Gustavo A. R. Silva
@ 2017-06-15 5:00 ` Joe Perches
2017-06-15 19:25 ` ulrik.debie-os
0 siblings, 1 reply; 3+ messages in thread
From: Joe Perches @ 2017-06-15 5:00 UTC (permalink / raw)
To: Gustavo A. R. Silva, Dmitry Torokhov; +Cc: linux-input, linux-kernel
On Wed, 2017-06-14 at 20:50 -0500, Gustavo A. R. Silva wrote:
> Remove unnecessary variable assignments.
> Variable _val_ is overwritten before the value stored in it can be used.
>
> Addresses-Coverity-ID: 1397695
> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
> ---
> drivers/input/tablet/gtco.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c
> index b796e89..d9de13c 100644
> --- a/drivers/input/tablet/gtco.c
> +++ b/drivers/input/tablet/gtco.c
> @@ -652,8 +652,6 @@ static void gtco_urb_callback(struct urb *urbinfo)
> switch (device->buffer[0]) {
> case 5:
> /* Pressure is 9 bits */
> - val = ((u16)(device->buffer[8]) << 1);
> - val |= (u16)(device->buffer[7] >> 7);
> input_report_abs(inputdev, ABS_PRESSURE,
> device->buffer[8]);
Perhaps more likely to be
input_report_abs(inputdev, ABS_PRESSURE, val);
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] USB: gtco: remove unnecessary variable assignments
2017-06-15 5:00 ` Joe Perches
@ 2017-06-15 19:25 ` ulrik.debie-os
0 siblings, 0 replies; 3+ messages in thread
From: ulrik.debie-os @ 2017-06-15 19:25 UTC (permalink / raw)
To: Joe Perches
Cc: Gustavo A. R. Silva, Dmitry Torokhov, linux-input, linux-kernel
Hi Joe, Gustavo,
On Wed, Jun 14, 2017 at 10:00:48PM -0700, Joe Perches wrote:
> On Wed, 2017-06-14 at 20:50 -0500, Gustavo A. R. Silva wrote:
> > Remove unnecessary variable assignments.
> > Variable _val_ is overwritten before the value stored in it can be used.
> >
> > Addresses-Coverity-ID: 1397695
> > Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
> > ---
> > drivers/input/tablet/gtco.c | 2 --
> > 1 file changed, 2 deletions(-)
> >
> > diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c
> > index b796e89..d9de13c 100644
> > --- a/drivers/input/tablet/gtco.c
> > +++ b/drivers/input/tablet/gtco.c
> > @@ -652,8 +652,6 @@ static void gtco_urb_callback(struct urb *urbinfo)
> > switch (device->buffer[0]) {
> > case 5:
> > /* Pressure is 9 bits */
> > - val = ((u16)(device->buffer[8]) << 1);
> > - val |= (u16)(device->buffer[7] >> 7);
> > input_report_abs(inputdev, ABS_PRESSURE,
> > device->buffer[8]);
>
> Perhaps more likely to be
>
> input_report_abs(inputdev, ABS_PRESSURE, val);
Probably that was the original intention but changing it that way now
would give a shift of factor 2 to userspace.
But if the 2 lines are deleted, I would update the comment above it so it
is clear the lowest significant bit in buffer[7] is not included in the
report call.
Kind regards,
Ulrik
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-06-15 1:50 [PATCH] USB: gtco: remove unnecessary variable assignments Gustavo A. R. Silva
2017-06-15 5:00 ` Joe Perches
2017-06-15 19:25 ` ulrik.debie-os
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