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Subject[PATCH v6 11/23] drivers/fsi: Add master unscan
Date
From: Chris Bostic <cbostic@linux.vnet.ibm.com>

Allow a master to undo a previous scan. Should a master scan a bus
twice it will need to ensure it doesn't double register any
previously detected device.

Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
drivers/fsi/fsi-core.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 4da0b030..75d2a88 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -69,6 +69,7 @@ struct fsi_slave {
uint32_t size; /* size of slave address space */
};

+#define to_fsi_master(d) container_of(d, struct fsi_master, dev)
#define to_fsi_slave(d) container_of(d, struct fsi_slave, dev)

static int fsi_master_read(struct fsi_master *master, int link,
@@ -491,6 +492,37 @@ static int fsi_master_scan(struct fsi_master *master)
return 0;
}

+static int __fsi_slave_remove_device(struct device *dev, void *arg)
+{
+ device_unregister(dev);
+ return 0;
+}
+
+static int __fsi_master_remove_slave(struct device *dev, void *arg)
+{
+ device_for_each_child(dev, NULL, __fsi_slave_remove_device);
+ device_unregister(dev);
+ return 0;
+}
+
+static void fsi_master_unscan(struct fsi_master *master)
+{
+ device_for_each_child(&master->dev, NULL, __fsi_master_remove_slave);
+}
+
+static ssize_t master_rescan_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct fsi_master *master = to_fsi_master(dev);
+
+ fsi_master_unscan(master);
+ fsi_master_scan(master);
+
+ return count;
+}
+
+static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store);
+
int fsi_master_register(struct fsi_master *master)
{
int rc;
@@ -507,7 +539,15 @@ int fsi_master_register(struct fsi_master *master)
return rc;
}

+ rc = device_create_file(&master->dev, &dev_attr_rescan);
+ if (rc) {
+ device_unregister(&master->dev);
+ ida_simple_remove(&master_ida, master->idx);
+ return rc;
+ }
+
fsi_master_scan(master);
+
return 0;
}
EXPORT_SYMBOL_GPL(fsi_master_register);
--
1.8.2.2
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