RE: hwmod and insertable modules

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Sanjeev,

> -----Original Message-----
> From: linux-omap-owner@xxxxxxxxxxxxxxx [mailto:linux-omap-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Premi, Sanjeev
> Sent: Friday, October 22, 2010 2:43 PM
> To: linux-omap@xxxxxxxxxxxxxxx
> Subject: hwmod and insertable modules
> 
> Hi all,
> 
> I was trying to use hwmod in one of the modules that user could choose
> to insert via insmod.
> 
> During module_init I used omap_device_build() to create the omap_device.
> But when trying to implement the module_exit, I couldn't find the
> corresponding 'destructor'.

omap_device_build essentially does  a platform_device register today
and hence its not something to be done from a insmod'able 'driver'.

Device registrations should happen only once from a board file or some
other place appropriate. The insmod'able driver can then be inserted
and rmmoded as many times without removing the device registration.

Regards,
Rajendra

> 
> I do see 4 kzalloc()s being called for each omap_device_build(). I do
> have a half-implemented destructor; but before I proceeded ahead I
> wanted to pose few questions which can help undertand if I am on a
> good track:
> 
> 1) Is the omap_device supposed to be persistent? i.e. subsequent
>    calls will return me the same device object?
> 
> 2) Has someone else tried to to use omap_device and done multiple
>    insmod and rmmod operations?
> 
> 3) Is my fear of memory leak real? OR there is some magic behind
>    omap_device_shutdown() that I haven't yet discovered?
> 
> Best regards,
> Sanjeev--
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