This patch avoids that complaints similar to the following appear in the
system log:
sysfs: cannot create duplicate filename '/devices/pseudo_0/adapter0/host3/target3:0:0/3:0:0:133/driver'
Cc: Lee Duncan <lduncan@xxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
drivers/base/dd.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index edfc9f0b1180..b4212154a94b 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -645,6 +645,14 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
{
int ret = 0;
+ /*
+ * Several callers check the driver pointer without holding the
+ * device mutex. Hence check the driver pointer again while holding
+ * the device mutex.
+ */
+ if (dev->driver)
+ return dev->driver == drv;
+
if (!device_is_registered(dev))
return -ENODEV;
--
2.19.1.568.g152ad8e336-goog
