On Tue, Oct 07, 2014 at 03:33:22PM +0200, Tobias Klauser wrote:
> On 2014-10-07 at 13:31:41 +0200, Pramod Gurav <pramod.gu...@smartplayin.com>
> wrote:
> > This change switch to managed resources to simplifies error handling
> > and module unloading and does away with platform_driver remove function.
> >
> > Cc: Dmitry Torokhov <dmitry.torok...@gmail.com>
> > Cc: linux-in...@vger.kernel.org
> > Signed-off-by: Pramod Gurav <pramod.gu...@smartplayin.com>
> > ---
> > drivers/input/keyboard/opencores-kbd.c | 54
> > ++++++++------------------------
> > 1 file changed, 13 insertions(+), 41 deletions(-)
> >
> > diff --git a/drivers/input/keyboard/opencores-kbd.c
> > b/drivers/input/keyboard/opencores-kbd.c
> > index 7b9b441..ecacb87 100644
> > --- a/drivers/input/keyboard/opencores-kbd.c
> > +++ b/drivers/input/keyboard/opencores-kbd.c
> > @@ -56,27 +56,27 @@ static int opencores_kbd_probe(struct platform_device
> > *pdev)
> > return -EINVAL;
> > }
> >
> > - opencores_kbd = kzalloc(sizeof(*opencores_kbd), GFP_KERNEL);
> > - input = input_allocate_device();
> > + opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd),
> > + GFP_KERNEL);
> > + input = devm_input_allocate_device(&pdev->dev);
> > if (!opencores_kbd || !input) {
> > dev_err(&pdev->dev, "failed to allocate device structures\n");
> > - error = -ENOMEM;
> > - goto err_free_mem;
> > + return -ENOMEM;
> > }
> >
> > opencores_kbd->addr_res = res;
> > - res = request_mem_region(res->start, resource_size(res), pdev->name);
> > + res = devm_request_mem_region(&pdev->dev, res->start,
> > + resource_size(res), pdev->name);
> > if (!res) {
> > dev_err(&pdev->dev, "failed to request I/O memory\n");
> > - error = -EBUSY;
> > - goto err_free_mem;
> > + return -EBUSY;
> > }
> >
> > - opencores_kbd->addr = ioremap(res->start, resource_size(res));
> > + opencores_kbd->addr = devm_ioremap(&pdev->dev, res->start,
> > + resource_size(res));
>
> You could use devm_ioremap_resource() here and get rid of the call to
> devm_request_mem_region() and the check for !res above, i.e. something
> like:
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> [...]
> opencores_kbd->addr = devm_ioremap_resource(&pdev->dev, res);
> if (!opencores_kbd->addr) {
> dev_err(&pdev->dev, "failed to remap I/O memory\n");
> return -ENXIO;
> }
You need to be careful with devm_ioremap_resource() ocnversions as it
returns ERR_PTR-encoded pointer on failures, not NULL.
I adjusted the patch to use devm_ioremap_resource() and applied.
Thanks.
--
Dmitry
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