diff options
| author | Saravana Kannan <saravanak@google.com> | 2023-03-03 16:53:54 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-10 09:06:22 +0100 |
| commit | f8fb576658a3e19796e2e1a12a5ec8f44dac02b6 (patch) | |
| tree | 754eb365da8989ddeebdd90206ee61ef7f799246 /drivers/base/dd.c | |
| parent | ffbe08a8e86d03513dc45b5389fab7f3477433b6 (diff) | |
driver core: Make state_synced device attribute writeable
If the file is written to and sync_state() hasn't been called for the
device yet, then call sync_state() for the device independent of the
state of its consumers.
This is useful for supplier devices that have one or more consumers that
don't have a driver but the consumers are in a state that don't use the
resources supplied by the supplier device.
This gives finer grained control than using the
fw_devlink.sync_state=timeout kernel commandline parameter.
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20230304005355.746421-3-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/dd.c')
| -rw-r--r-- | drivers/base/dd.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 84f07e0050dd..7b9ab2050b84 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -510,6 +510,27 @@ EXPORT_SYMBOL_GPL(device_bind_driver); static atomic_t probe_count = ATOMIC_INIT(0); static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue); +static ssize_t state_synced_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret = 0; + + if (strcmp("1", buf)) + return -EINVAL; + + device_lock(dev); + if (!dev->state_synced) { + dev->state_synced = true; + dev_sync_state(dev); + } else { + ret = -EINVAL; + } + device_unlock(dev); + + return ret ? ret : count; +} + static ssize_t state_synced_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -521,7 +542,7 @@ static ssize_t state_synced_show(struct device *dev, return sysfs_emit(buf, "%u\n", val); } -static DEVICE_ATTR_RO(state_synced); +static DEVICE_ATTR_RW(state_synced); static void device_unbind_cleanup(struct device *dev) { |