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SubjectRe: [PATCH] Store the relevant miscdevice in file->private_data in misc_open()
On Thu, Nov 13, 2008 at 03:49:50PM +1100, Michael Ellerman wrote:
> Currently it's not easy to share file_operations between multiple
> instances of a miscdevice. In order to do this, the device code needs to
> store a list of all it's miscdevice instances, and when fops->open() is
> called, search the list and find the right device based on the minor
> number.
> However the generic miscdevice code already has a list of miscdevices,
> and uses this to find the right device in misc_open(). If misc_open()
> would store the miscdevice it found in file->private_data, then the
> device code wouldn't need to worry about storing it's own separate list
> and searching that as well.
> The rest of the miscdevice code does not use file->private_data, so the
> device code is still free to use file->private_data for something else
> if it wants to.
> Signed-off-by: Michael Ellerman <>

Do you have a follow-on patch for some misc device using code that would
take advantage of this change?


greg k-h

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