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authorDave Penkler <dpenkler@gmail.com>2016-09-28 20:06:01 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-10-24 14:36:25 +0200
commit88aecde40b84f2f631357c75337f79b8caa97757 (patch)
tree1a9843295329acbd88e1ff369c12643801dd10d0 /drivers/usb/class/usbtmc.c
parentusb: fix a typo in usb_class_driver documentation (diff)
downloadlinux-88aecde40b84f2f631357c75337f79b8caa97757.tar.xz
linux-88aecde40b84f2f631357c75337f79b8caa97757.zip
usbtmc: Add, clarify and fix comments
Add information regarding lifespan of kref protection: Clarify comment on kref_get for interrupt in urb in usbtmc_probe() Add comment on kref_get in usbtmc_open() Fix endpoint reference in documentation for send_request_dev_dep_msg_in() Signed-off-by: Dave Penkler <dpenkler@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class/usbtmc.c')
-rw-r--r--drivers/usb/class/usbtmc.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index a6c1fae7d52a..f03692ec5520 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -157,6 +157,7 @@ static int usbtmc_open(struct inode *inode, struct file *filp)
}
data = usb_get_intfdata(intf);
+ /* Protect reference to data from file structure until release */
kref_get(&data->kref);
/* Store pointer in file structure's private data field */
@@ -531,7 +532,7 @@ static int usbtmc488_ioctl_simple(struct usbtmc_device_data *data,
}
/*
- * Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-IN endpoint.
+ * Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-OUT endpoint.
* @transfer_size: number of bytes to request from the device.
*
* See the USBTMC specification, Table 4.
@@ -1471,7 +1472,7 @@ static int usbtmc_probe(struct usb_interface *intf,
if (!data->iin_urb)
goto error_register;
- /* will reference data in int urb */
+ /* Protect interrupt in endpoint data until iin_urb is freed */
kref_get(&data->kref);
/* allocate buffer for interrupt in */