linux-kernel - Re: Spinlock query

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Date:	Wed, 30 Aug 2006 08:03:52 -0400
From:	Rik van Riel <riel@...riel.com>
To:	Rajat Jain <rajat.noida.india@...il.com>
CC:	Rick Brown <rick.brown.3@...il.com>, kernelnewbies@...linux.org,
	linux-kernel@...r.kernel.org
Subject: Re: Spinlock query

Rajat Jain wrote:
> On 8/30/06, Rik van Riel <riel@...riel.com> wrote:
>> Rick Brown wrote:
>> > Hi,
>> >
>> > In my driver (Process context), I have written the following code:
>> >
>> > --------------------------------------------
>> > spin_lock(lock)
>> > ...
>> > //Critical section to manipulate driver data
>>
>> ... interrupt hits here
>>     interrupt handler tries to grab the spinlock, which is already taken
>>     *BOOM*
>>
>> > spin_u lock(lock)
>> > ---------------------------------------------
>> >
> 
> The interrupt handler TRIES to grab the spinlock, which is already
> taken. Why will it "BOOM"? Wouldn't the interrupt handler busy wait,
> waiting for the lock?
> 
> Am I missing something here?

Yes, it will busy wait.  Forever.


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