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Code Issues Releases Activity

Use ofw_bus_find_child_device_by_phandle to see if the child we're

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adding already exists and if so just return that. The typical use case
is from identify routines, which shouldn't be adding multiple copies
of the same phandle_t to the gpiobus. Only one per phandle_t is needed
(or expected by the current code).

Differential Revision: https://reviews.freebsd.org/D2871
This commit is contained in:
Warner Losh 2015-06-20 04:48:53 +00:00
parent bb39ff4c36
commit 3dede9f354
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=284625
1 changed files with 8 additions and 0 deletions
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8
sys/dev/gpio/ofw_gpiobus.c
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@ -55,6 +55,14 @@ ofw_gpiobus_add_fdt_child(device_t bus, const char *drvname, phandle_t child)
struct gpiobus_ivar *devi;
struct ofw_gpiobus_devinfo *dinfo;
/*
* Check to see if we already have a child for @p child, and if so
* return it.
*/
childdev = ofw_bus_find_child_device_by_phandle(bus, child);
if (childdev != NULL)
return (childdev);
/*
* Set up the GPIO child and OFW bus layer devinfo and add it to bus.
*/