On Wed, Sep 02, 2015 at 08:28:52AM +0200, Daniel Schultz wrote:
> Get a 'struct mci' by search after the device name.
>
> Signed-off-by: Daniel Schultz <[email protected]>
> ---
>
> Changes:
> v3:
> New with patch v3
>
> drivers/mci/mci-core.c | 16 ++++++++++++++++
> include/mci.h | 8 ++++++++
> 2 files changed, 24 insertions(+)
>
> diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
> index c22f932..d6865d1 100644
> --- a/drivers/mci/mci-core.c
> +++ b/drivers/mci/mci-core.c
> @@ -53,6 +53,8 @@
> __res & __mask; \
> })
>
> +LIST_HEAD(mci_list);
> +
> /**
> * @file
> * @brief Memory Card framework
> @@ -1753,6 +1755,8 @@ int mci_register(struct mci_host *host)
> mci->dev.id = DEVICE_ID_DYNAMIC;
> }
>
> + list_add_tail(&mci->list, &mci_list);
> +
mci_register() may fail later in which case you end up with an undefined
entry in the mci_list. This should be done near the end of
mci_register() when it can't fail anymore.
> mci->dev.platform_data = host;
> mci->dev.parent = host->hw_dev;
> mci->host = host;
> @@ -1844,3 +1848,15 @@ void mci_of_parse(struct mci_host *host)
>
> host->non_removable = of_property_read_bool(np, "non-removable");
> }
> +
> +struct mci *mci_get_device_by_name(const char *name)
> +{
> + struct mci *dev;
> +
> + for_each_mci_device(dev) {
> + if (!strcmp(dev->cdevname, name))
> + return dev;
> + }
dev->cdevname is initialized only in mci_card_probe() and only when
actually a card is detected. This causes a NULL pointer exception for
example when a there's no card in a slot. This has to be checked here.
It's a bit confusing when a variable named 'dev' not of type struct
device_d. Please rather use more specific names, like 'mci' in this
case.
I applied a fixed version to the -next branch.
Sascha
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