RE: [PATCH] platform: fall-back to driver name check if there isno id found

From: Hein Tibosch
Date: Fri Apr 19 2013 - 09:17:22 EST


Hi Andy, Mika,

On 8 Feb 2013, Andy Shevchenko wrote:

> Some of the platform devices rely on the name of their driver to match with. In
> the current implementation, if platform id table is needed, they have to add
> the name to the platform id table which sounds alogical. The patch adjustes the
> logic of the id table matching to make sure we will fall-back to match by the
> driver name. This will make it similar to the DT or ACPI cases.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Reported-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> Cc: Eric Miao <eric.miao@xxxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
> ---
> drivers/base/platform.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index c0b8df3..452ba4b 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -732,8 +732,8 @@ static int platform_match(struct device *dev, struct device_driver *drv)
> return 1;
>
> /* Then try to match against the id table */
> - if (pdrv->id_table)
> - return platform_match_id(pdrv->id_table, pdev) != NULL;
> + if (pdrv->id_table && platform_match_id(pdrv->id_table, pdev))
> + return 1;
>
> /* fall-back to driver name match */
> return (strcmp(pdev->name, drv->name) == 0);

When I upgraded an avr32 system from 3.8 to a recent next release, I found it was
broken: DMA was not available because the dw_dma driver did not get probed anymore.

The dw_dma driver does have a id_table, but the boards in arch/avr32 are still expecting
driver identification by name.

As long as we want to support this simple identification-by-name, I'd say Andy's patch
should get quickly into stable release.


Hein
--
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/