diff options
| author | Dave Penkler <dpenkler@gmail.com> | 2016-09-28 20:06:01 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-24 14:36:25 +0200 |
| commit | 88aecde40b84f2f631357c75337f79b8caa97757 (patch) | |
| tree | 1a9843295329acbd88e1ff369c12643801dd10d0 /drivers/usb/class/usbtmc.c | |
| parent | 864e2fe935228c5c551da8638b5fdd07f82d04a7 (diff) | |
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.c | 5 |
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 */ |