[PATCH 05/21] driver core: bus: sysfs function cleanups

Greg Kroah-Hartman
2023-02-08T11:15:38Z

Convert the drivers_autoprobe show/store and uevent sysfs callbacks to
use bus_to_subsys() and not use the back-pointer to the private
structure.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/base/bus.c | 35 +++++++++++++++++++++++++++++------
1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 8debbe00b4ca..f0d3ad41fd5e 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -277,16 +277,31 @@ static DRIVER_ATTR_IGNORE_LOCKDEP(bind, 0200, NULL, bind_store);

static ssize_t drivers_autoprobe_show(struct bus_type *bus, char *buf)
{
- return sysfs_emit(buf, "%d\n", bus->p->drivers_autoprobe);
+ struct subsys_private *sp = bus_to_subsys(bus);
+ int ret;
+
+ if (!sp)
+ return -EINVAL;
+
+ ret = sysfs_emit(buf, "%d\n", sp->drivers_autoprobe);
+ subsys_put(sp);
+ return ret;
}

static ssize_t drivers_autoprobe_store(struct bus_type *bus,
const char *buf, size_t count)
{
+ struct subsys_private *sp = bus_to_subsys(bus);
+
+ if (!sp)
+ return -EINVAL;
+
if (buf[0] == '0')
- bus->p->drivers_autoprobe = 0;
+ sp->drivers_autoprobe = 0;
else
- bus->p->drivers_autoprobe = 1;
+ sp->drivers_autoprobe = 1;
+
+ subsys_put(sp);
return count;
}

@@ -769,10 +784,18 @@ static void klist_devices_put(struct klist_node *n)
static ssize_t bus_uevent_store(struct bus_type *bus,
const char *buf, size_t count)
{
- int rc;
+ struct subsys_private *sp = bus_to_subsys(bus);
+ int ret;

- rc = kobject_synth_uevent(&bus->p->subsys.kobj, buf, count);
- return rc ? rc : count;
+ if (!sp)
+ return -EINVAL;
+
+ ret = kobject_synth_uevent(&sp->subsys.kobj, buf, count);
+ subsys_put(sp);
+
+ if (ret)
+ return ret;
+ return count;
}
/*
* "open code" the old BUS_ATTR() macro here. We want to use BUS_ATTR_WO()
--
2.39.1