* [PATCH] staging: nvec: Fix usleep_range is preferred over udelay
@ 2017-11-29 16:00 Joshua Abraham
2017-11-29 16:07 ` Mikko Perttunen
0 siblings, 1 reply; 3+ messages in thread
From: Joshua Abraham @ 2017-11-29 16:00 UTC (permalink / raw)
To: marvin24; +Cc: gregkh, ac100, linux-tegra, devel, linux-kernel
Signed-off-by: Joshua Abraham <j.abraham1776@gmail.com>
This patch fixes the issue:
CHECK: usleep_range is preferred over udelay; see
Documentation/timers/timers-howto.txt
---
drivers/staging/nvec/nvec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
index 4ff8f47385da..2a01ef4b54ff 100644
--- a/drivers/staging/nvec/nvec.c
+++ b/drivers/staging/nvec/nvec.c
@@ -631,7 +631,7 @@ static irqreturn_t nvec_interrupt(int irq, void *dev)
break;
case 2: /* first byte after command */
if (status == (I2C_SL_IRQ | RNW | RCVD)) {
- udelay(33);
+ usleep_range(30, 35);
if (nvec->rx->data[0] != 0x01) {
dev_err(nvec->dev,
"Read without prior read command\n");
--
2.15.0
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] staging: nvec: Fix usleep_range is preferred over udelay
2017-11-29 16:00 [PATCH] staging: nvec: Fix usleep_range is preferred over udelay Joshua Abraham
@ 2017-11-29 16:07 ` Mikko Perttunen
2017-11-29 16:17 ` Josh Abraham
0 siblings, 1 reply; 3+ messages in thread
From: Mikko Perttunen @ 2017-11-29 16:07 UTC (permalink / raw)
To: Joshua Abraham, marvin24; +Cc: gregkh, ac100, linux-tegra, devel, linux-kernel
On 11/29/2017 06:00 PM, Joshua Abraham wrote:
> Signed-off-by: Joshua Abraham <j.abraham1776@gmail.com>
>
> This patch fixes the issue:
>
> CHECK: usleep_range is preferred over udelay; see
> Documentation/timers/timers-howto.txt
>
> ---
> drivers/staging/nvec/nvec.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
> index 4ff8f47385da..2a01ef4b54ff 100644
> --- a/drivers/staging/nvec/nvec.c
> +++ b/drivers/staging/nvec/nvec.c
> @@ -631,7 +631,7 @@ static irqreturn_t nvec_interrupt(int irq, void *dev)
> break;
> case 2: /* first byte after command */
> if (status == (I2C_SL_IRQ | RNW | RCVD)) {
> - udelay(33);
> + usleep_range(30, 35);
> if (nvec->rx->data[0] != 0x01) {
> dev_err(nvec->dev,
> "Read without prior read command\n");
>
This is incorrect, as this function is an interrupt handler and we
cannot sleep in interrupt context.
Cheers,
Mikko
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] staging: nvec: Fix usleep_range is preferred over udelay
2017-11-29 16:07 ` Mikko Perttunen
@ 2017-11-29 16:17 ` Josh Abraham
0 siblings, 0 replies; 3+ messages in thread
From: Josh Abraham @ 2017-11-29 16:17 UTC (permalink / raw)
To: Mikko Perttunen; +Cc: marvin24, gregkh, ac100, linux-tegra, devel, linux-kernel
On Wed, Nov 29, 2017 at 06:07:53PM +0200, Mikko Perttunen wrote:
> On 11/29/2017 06:00 PM, Joshua Abraham wrote:
> > Signed-off-by: Joshua Abraham <j.abraham1776@gmail.com>
> >
> > This patch fixes the issue:
> >
> > CHECK: usleep_range is preferred over udelay; see
> > Documentation/timers/timers-howto.txt
> >
> > ---
> > drivers/staging/nvec/nvec.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
> > index 4ff8f47385da..2a01ef4b54ff 100644
> > --- a/drivers/staging/nvec/nvec.c
> > +++ b/drivers/staging/nvec/nvec.c
> > @@ -631,7 +631,7 @@ static irqreturn_t nvec_interrupt(int irq, void *dev)
> > break;
> > case 2: /* first byte after command */
> > if (status == (I2C_SL_IRQ | RNW | RCVD)) {
> > - udelay(33);
> > + usleep_range(30, 35);
> > if (nvec->rx->data[0] != 0x01) {
> > dev_err(nvec->dev,
> > "Read without prior read command\n");
> >
>
> This is incorrect, as this function is an interrupt handler and we cannot
> sleep in interrupt context.
>
> Cheers,
> Mikko
My mistake. Thank you for the feedback!
-Josh
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-11-29 16:00 [PATCH] staging: nvec: Fix usleep_range is preferred over udelay Joshua Abraham
2017-11-29 16:07 ` Mikko Perttunen
2017-11-29 16:17 ` Josh Abraham
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