* [PATCH] Input: add error handling for da9052_reg_write
@ 2018-06-11 5:23 Zhouyang Jia
2018-06-11 17:30 ` Dmitry Torokhov
0 siblings, 1 reply; 3+ messages in thread
From: Zhouyang Jia @ 2018-06-11 5:23 UTC (permalink / raw)
Cc: Zhouyang Jia, Support Opensource, Dmitry Torokhov, linux-input,
linux-kernel
When da9052_reg_write fails, the lack of error-handling code may
cause unexpected results.
This patch adds error-handling code after calling da9052_reg_write.
Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
---
drivers/input/touchscreen/da9052_tsi.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
index b5dfd594..60c82a0 100644
--- a/drivers/input/touchscreen/da9052_tsi.c
+++ b/drivers/input/touchscreen/da9052_tsi.c
@@ -319,8 +319,11 @@ static int da9052_ts_probe(struct platform_device *pdev)
static int da9052_ts_remove(struct platform_device *pdev)
{
struct da9052_tsi *tsi = platform_get_drvdata(pdev);
+ int error;
- da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
+ error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
+ if (error < 0)
+ return error;
da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi);
da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi);
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] Input: add error handling for da9052_reg_write
2018-06-11 5:23 [PATCH] Input: add error handling for da9052_reg_write Zhouyang Jia
@ 2018-06-11 17:30 ` Dmitry Torokhov
2018-06-12 5:37 ` Steve Twiss
0 siblings, 1 reply; 3+ messages in thread
From: Dmitry Torokhov @ 2018-06-11 17:30 UTC (permalink / raw)
To: Zhouyang Jia; +Cc: Support Opensource, linux-input, linux-kernel
Hi Zhouyang,
On Mon, Jun 11, 2018 at 01:23:39PM +0800, Zhouyang Jia wrote:
> When da9052_reg_write fails, the lack of error-handling code may
> cause unexpected results.
>
> This patch adds error-handling code after calling da9052_reg_write.
>
> Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> ---
> drivers/input/touchscreen/da9052_tsi.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
> index b5dfd594..60c82a0 100644
> --- a/drivers/input/touchscreen/da9052_tsi.c
> +++ b/drivers/input/touchscreen/da9052_tsi.c
> @@ -319,8 +319,11 @@ static int da9052_ts_probe(struct platform_device *pdev)
> static int da9052_ts_remove(struct platform_device *pdev)
> {
> struct da9052_tsi *tsi = platform_get_drvdata(pdev);
> + int error;
>
> - da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
> + error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
> + if (error < 0)
> + return error;
No, this does not help anything. The remove() action must not fail
(really, having it return an int and not void was an API mistake made
long time ago), and thus returning early in and event of error failing
to communicate with the device is a mistake. You really want to release
the interrupts and memory and unregister input device before returning.
>
> da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi);
> da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi);
> --
> 2.7.4
>
Thanks.
--
Dmitry
^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: [PATCH] Input: add error handling for da9052_reg_write
2018-06-11 17:30 ` Dmitry Torokhov
@ 2018-06-12 5:37 ` Steve Twiss
0 siblings, 0 replies; 3+ messages in thread
From: Steve Twiss @ 2018-06-12 5:37 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: linux-input, linux-kernel, Support Opensource
On 11 June 2018 18:30 wrote Dmitry Torokhov
> Subject: Re: [PATCH] Input: add error handling for da9052_reg_write
>
> Hi Zhouyang,
>
> On Mon, Jun 11, 2018 at 01:23:39PM +0800, Zhouyang Jia wrote:
> > When da9052_reg_write fails, the lack of error-handling code may
> > cause unexpected results.
> >
> > This patch adds error-handling code after calling da9052_reg_write.
> >
> > Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> > ---
> > drivers/input/touchscreen/da9052_tsi.c | 5 ++++-
> > 1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/input/touchscreen/da9052_tsi.c
> b/drivers/input/touchscreen/da9052_tsi.c
> > index b5dfd594..60c82a0 100644
> > --- a/drivers/input/touchscreen/da9052_tsi.c
> > +++ b/drivers/input/touchscreen/da9052_tsi.c
> > @@ -319,8 +319,11 @@ static int da9052_ts_probe(struct platform_device *pdev)
> > static int da9052_ts_remove(struct platform_device *pdev)
> > {
> > struct da9052_tsi *tsi = platform_get_drvdata(pdev);
> > + int error;
> >
> > - da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
> > + error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
> > + if (error < 0)
> > + return error;
>
> No, this does not help anything. The remove() action must not fail
> (really, having it return an int and not void was an API mistake made
> long time ago), and thus returning early in and event of error failing
> to communicate with the device is a mistake. You really want to release
> the interrupts and memory and unregister input device before returning.
>
> >
> > da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi);
> > da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi);
> > --
> > 2.7.4
> >
script?
https://patchwork.kernel.org/project/LKML/list/?submitter=181001
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-06-11 17:30 ` Dmitry Torokhov
2018-06-12 5:37 ` Steve Twiss
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