Re: devm_kfree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



2011/12/26 Julia Lawall <julia.lawall@xxxxxxx>:
> Is it reasonable to use devm_kfree in a probe function that fails or a
> remove function that succeeds?

I cannot catch your question. If the memory is allocated by
devm_kzalloc(), it is not necessary to release with devm_kfree() at
all. It would be release once the driver was detached or destroyed.

>
> Examples from drivers/watchdog/shwdt.c:
>
> sh_wdt_probe:
>
>        ...
>  out_unreg:
>        unregister_reboot_notifier(&sh_wdt_notifier);
>  out_unmap:
> -       devm_iounmap(&pdev->dev, wdt->base);
>  out_err:
> -       devm_kfree(&pdev->dev, wdt);

It is necessary?

>  out_release:
> -       devm_release_mem_region(&pdev->dev, res->start, resource_size(res));

It is necessary?

>
>        return rc;
>  }
>
>
> sh_wdt_remove:
>
>        ...
>        unregister_reboot_notifier(&sh_wdt_notifier);
>        devm_release_mem_region(&pdev->dev, res->start, resource_size(res));
>        devm_iounmap(&pdev->dev, wdt->base);
>        devm_kfree(&pdev->dev, wdt);

These lines should be deleted if the driver has detached.

>
>        return 0;
> }
>
>
> On the other hand, perhaps devm_kfree is needed in probe function that
> succeeds, eg in drivers/input/keyboard/samsung-keypad.c:
>
>        if (pdev->dev.of_node) {
>                devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
>                devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
>                devm_kfree(&pdev->dev, (void *)pdata);
>        }
>        return 0;
>
> julia
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Kernel Development]     [Kernel Announce]     [Kernel Newbies]     [Linux Networking Development]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Device Mapper]

  Powered by Linux