ext Russell King wrote:
> On Mon, Dec 04, 2006 at 04:13:39PM -0400, Anderson Briglia wrote:
>> Implement MMC password force erase, remove password, change password,
>> unlock card and assign password operations. It uses the sysfs mechanism
>> to send commands to the MMC subsystem.
>
> Sorry, this is still unsuitable for mainline.
Ok. I will fix the code and send another version of this patch on the V9 series e-mail thread.
>
>> Signed-off-by: Carlos Eduardo Aguiar <carlos.aguiar <at> indt.org.br>
>> Signed-off-by: Anderson Lizardo <anderson.lizardo <at> indt.org.br>
>> Signed-off-by: Anderson Briglia <anderson.briglia <at> indt.org.br>
>
> Please use the standard format, do not obfuscate these. The kernel
> community utterly abhors this.
Ok.
>
>> +/*
>> + * implement MMC password functions: force erase, remove password, change
>> + * password, unlock card and assign password.
>> + */
>> +static ssize_t
>> +mmc_lockable_store(struct device *dev, struct device_attribute *att,
>> + const char *data, size_t len)
>> +{
>> + struct mmc_card *card = dev_to_mmc_card(dev);
>> + int err = 0;
>
> Where is the check that the host can do byte-wise data transfers?
It's checked on the macro "mmc_card_lockable".
>
>> +
>> + err = mmc_card_claim_host(card);
>> + if (err != MMC_ERR_NONE)
>> + return -EINVAL;
>> +
>> + if (!mmc_card_lockable(card))
>> + return -EINVAL;
>
> So writing to this file with a card which is not lockable results in
> deadlocking the host. Suggest you do as other subsystems do and have
> one exit path, and use gotos, setting the appropriate return code in a
> variable. If everything goes via that it forces you to think about
> where you want to jump to in each case.
>
Thanks, as said before, I'll update the code and send it again.
Best Regards,
Anderson Briglia
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