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SubjectRe: [PATCH v8 01/12] drivers: base: Unified device connection lookup
On Wed, Mar 14, 2018 at 04:12:04PM +0300, Heikki Krogerus wrote:
> Several frameworks - clk, gpio, phy, pmw, etc. - maintain
> lookup tables for describing connections and provide custom
> API for handling them. This introduces a single generic
> lookup table and API for the connections.
>
> The motivation for this commit is centralizing the
> connection lookup, but the goal is to ultimately extract the
> connection descriptions also from firmware by using the
> fwnode_graph_* functions and other mechanisms that are
> available.
>
> Reviewed-by: Hans de Goede <hdegoede@redhat.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> ---
> Changes in v8:
> - No longer using rcu.

Ok, but then:

> +void *device_connection_find_match(struct device *dev, const char *con_id,
> + void *data,
> + void *(*match)(struct device_connection *con,
> + int ep, void *data))
> +{
> + const char *devname = dev_name(dev);
> + struct device_connection *con;
> + void *ret = NULL;
> + int ep;
> +
> + if (!match)
> + return NULL;
> +
> + mutex_lock(&devcon_lock);
> +
> + list_for_each_entry_rcu(con, &devcon_list, list) {

_rcu calls everywhere :(

Did you send out the right version of this patch?

Also, further down you do:

> +#include <linux/platform_device.h>
> +#include <linux/spi/spi.h>
> +#include <linux/i2c.h>
> +#include <linux/pci.h>

Eeek, #include in the middle of a file, not good.

> +
> +static struct bus_type *generic_match_buses[] = {
> + &platform_bus_type,
> +#ifdef CONFIG_PCI
> + &pci_bus_type,
> +#endif
> +#ifdef CONFIG_I2C
> + &i2c_bus_type,
> +#endif
> +#ifdef CONFIG_SPI_MASTER
> + &spi_bus_type,
> +#endif
> + NULL,
> +};

Can't you just declare the above as "extern" variables and not need the
#include? Yeah, checkpatch will complain, but it should be fine here as
we really don't want the full .h files here (or need them.)

> +void device_connection_remove(struct device_connection *con)
> +{
> + mutex_lock(&devcon_lock);
> + list_del_rcu(&con->list);

See, rcu?

thanks,

greg k-h

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