On Mon, Feb 22, 2010 at 09:06:13PM +0100, Frank Wille wrote:
> Andrew Doran wrote:
>
> >> I'm just unsure about using mutexes during the callout. I have an
> >> IPL_NONE-kmutex which locks register access (my chip supports several
> >> register banks, so I need to make sure they are not switched).
Andrew Doran wrote:
>> I'm just unsure about using mutexes during the callout. I have an
>> IPL_NONE-kmutex which locks register access (my chip supports several
>> register banks, so I need to make sure they are not switched). May I
>> acquire this mutex during a callout (which is a softint, as I
On Mon, Feb 08, 2010 at 03:04:07PM +0100, Frank Wille wrote:
> On Mon, 8 Feb 2010 11:29:51 +0100
> Martin Husemann wrote:
>
> > On Mon, Feb 08, 2010 at 11:11:04AM +0100, Frank Wille wrote:
> > > - Running a kthread and calling kpause() between the polls.
> > > - Using a callout which reschedules
On Mon, Feb 08, 2010 at 03:36:07PM +0100, Martin Husemann wrote:
> On Mon, Feb 08, 2010 at 03:35:35PM +0100, Frank Wille wrote:
> > IMHO that would allow my callout to sleep on acquiring the mutex?
>
> A softint can sleep, a callout can not.
s/can/should/
Joerg
On Mon, Feb 08, 2010 at 03:35:35PM +0100, Frank Wille wrote:
> IMHO that would allow my callout to sleep on acquiring the mutex?
A softint can sleep, a callout can not.
Martin
On Mon, 8 Feb 2010 15:12:10 +0100
Martin Husemann wrote:
> On Mon, Feb 08, 2010 at 03:09:55PM +0100, Martin Husemann wrote:
> > The wording is not explicit, but a softint is not allowed to block
> > on
>
> s/softint/callout/ of course, sorry for the confusion.
*Now* you confused me! :)
A callou
On Mon, 8 Feb 2010 15:09:55 +0100
Martin Husemann wrote:
> On Mon, Feb 08, 2010 at 03:04:07PM +0100, Frank Wille wrote:
> > [...] May I acquire this mutex during a callout (which is a
> > softint, as I understand)? Will the softint sleep or busy-wait?
>
> Depends on the mutex type, from mutex(9)
On Mon, Feb 08, 2010 at 03:09:55PM +0100, Martin Husemann wrote:
> The wording is not explicit, but a softint is not allowed to block on
s/softint/callout/ of course, sorry for the confusion.
Martin
On Mon, Feb 08, 2010 at 03:04:07PM +0100, Frank Wille wrote:
> I'm just unsure about using mutexes during the callout. I have an
> IPL_NONE-kmutex which locks register access (my chip supports several
> register banks, so I need to make sure they are not switched). May I
> acquire this mutex during
On Mon, 8 Feb 2010 11:29:51 +0100
Martin Husemann wrote:
> On Mon, Feb 08, 2010 at 11:11:04AM +0100, Frank Wille wrote:
> > - Running a kthread and calling kpause() between the polls.
> > - Using a callout which reschedules itself after the poll.
>
> The thread is quite a bit more heavyweight, b
On Mon, Feb 08, 2010 at 11:11:04AM +0100, Frank Wille wrote:
> - Running a kthread and calling kpause() between the polls.
> - Using a callout which reschedules itself after the poll.
The thread is quite a bit more heavyweight, but you have full freedom
to do what you want. The callout is pretty l
Hi,
I'm writing a keyboard driver which doesn't support interrupts in some
revisions, so I have to poll its status from time to time. What would
be better suited for that task:
- Running a kthread and calling kpause() between the polls.
- Using a callout which reschedules itself after the poll.
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