Messages in this thread |  | | Date | Mon, 24 Sep 2012 13:20:42 -0700 | From | Stephen Boyd <> | Subject | Re: [PATCH 0/3] Introduce devm_clk_register() |
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On 09/22/12 03:06, Russell King - ARM Linux wrote: > On Tue, Sep 18, 2012 at 11:05:27PM -0700, Stephen Boyd wrote: >> The first patch in this series fixes error checking in the wm831x clock >> driver and is here to prevent context conflicts in the third patch. >> I split it out in case it needed to merge sooner rather than later. >> >> The goal of this series is to add devm_clk_register() so I can use it in >> some MSM clock code I'm sending out in the near future. The second >> patch adds the API and the third patch moves over an existing user of >> clk_unregister() to the devm API. > Can we guarantee that the clocks are unused when the module is removed? > If we can't make that guarantee, then devm_* should not be used here, > and instead there should be refcounting done in the clocks (that's what > the __clk_get() and __clk_put() hooks are there for.)
We could guarantee that when clk_unregister() is actually implemented. __clk_get() would need to forward a call to the module providing the clock via try_module_get(). Similarly we would call module_put() in __clk_put(). That would prevent unbinding the driver from the device via module removal.
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