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Date: Tue, 19 Jun 2012 12:41:59 +0200
From: Bjørn Mork <bjorn@...k.no>
To: netdev@...r.kernel.org
Cc: Oliver Neukum <oliver@...kum.org>, Dan Williams <dcbw@...hat.com>,
linux-usb@...r.kernel.org,
"Andrew Bird (Sphere Systems)" <ajb@...eresystems.co.uk>,
Bjørn Mork <bjorn@...k.no>
Subject: [PATCH net-next 1/5] net: qmi_wwan: define a structure for driver specific state
usbnet allocates a fixed size array for minidriver specific
state. Naming the fields and taking advantage of type checking
is a bit more failsafe than casting array elements each time
they are referenced.
Signed-off-by: Bjørn Mork <bjorn@...k.no>
---
drivers/net/usb/qmi_wwan.c | 49 ++++++++++++++++++++++++++------------------
1 file changed, 29 insertions(+), 20 deletions(-)
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 3b20678..c7b9be8 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -54,6 +54,13 @@
* corresponding management interface
*/
+/* driver specific data */
+struct qmi_wwan_state {
+ struct usb_driver *subdriver;
+ atomic_t pmcount;
+ unsigned long unused[3];
+};
+
static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf)
{
int status = -1;
@@ -65,9 +72,11 @@ static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf)
struct usb_cdc_ether_desc *cdc_ether = NULL;
u32 required = 1 << USB_CDC_HEADER_TYPE | 1 << USB_CDC_UNION_TYPE;
u32 found = 0;
- atomic_t *pmcount = (void *)&dev->data[1];
+ struct qmi_wwan_state *info = (void *)&dev->data;
+
+ BUILD_BUG_ON((sizeof(((struct usbnet *)0)->data) < sizeof(struct qmi_wwan_state)));
- atomic_set(pmcount, 0);
+ atomic_set(&info->pmcount, 0);
/*
* assume a data interface has no additional descriptors and
@@ -177,12 +186,12 @@ err:
/* using a counter to merge subdriver requests with our own into a combined state */
static int qmi_wwan_manage_power(struct usbnet *dev, int on)
{
- atomic_t *pmcount = (void *)&dev->data[1];
+ struct qmi_wwan_state *info = (void *)&dev->data;
int rv = 0;
- dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(pmcount), on);
+ dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);
- if ((on && atomic_add_return(1, pmcount) == 1) || (!on && atomic_dec_and_test(pmcount))) {
+ if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
/* need autopm_get/put here to ensure the usbcore sees the new value */
rv = usb_autopm_get_interface(dev->intf);
if (rv < 0)
@@ -212,7 +221,7 @@ static int qmi_wwan_bind_shared(struct usbnet *dev, struct usb_interface *intf)
{
int rv;
struct usb_driver *subdriver = NULL;
- atomic_t *pmcount = (void *)&dev->data[1];
+ struct qmi_wwan_state *info = (void *)&dev->data;
/* ZTE makes devices where the interface descriptors and endpoint
* configurations of two or more interfaces are identical, even
@@ -228,7 +237,7 @@ static int qmi_wwan_bind_shared(struct usbnet *dev, struct usb_interface *intf)
goto err;
}
- atomic_set(pmcount, 0);
+ atomic_set(&info->pmcount, 0);
/* collect all three endpoints */
rv = usbnet_get_endpoints(dev, intf);
@@ -251,7 +260,7 @@ static int qmi_wwan_bind_shared(struct usbnet *dev, struct usb_interface *intf)
dev->status = NULL;
/* save subdriver struct for suspend/resume wrappers */
- dev->data[0] = (unsigned long)subdriver;
+ info->subdriver = subdriver;
err:
return rv;
@@ -282,12 +291,12 @@ err:
static void qmi_wwan_unbind_shared(struct usbnet *dev, struct usb_interface *intf)
{
- struct usb_driver *subdriver = (void *)dev->data[0];
+ struct qmi_wwan_state *info = (void *)&dev->data;
- if (subdriver && subdriver->disconnect)
- subdriver->disconnect(intf);
+ if (info->subdriver && info->subdriver->disconnect)
+ info->subdriver->disconnect(intf);
- dev->data[0] = (unsigned long)NULL;
+ info->subdriver = NULL;
}
/* suspend/resume wrappers calling both usbnet and the cdc-wdm
@@ -299,15 +308,15 @@ static void qmi_wwan_unbind_shared(struct usbnet *dev, struct usb_interface *int
static int qmi_wwan_suspend(struct usb_interface *intf, pm_message_t message)
{
struct usbnet *dev = usb_get_intfdata(intf);
- struct usb_driver *subdriver = (void *)dev->data[0];
+ struct qmi_wwan_state *info = (void *)&dev->data;
int ret;
ret = usbnet_suspend(intf, message);
if (ret < 0)
goto err;
- if (subdriver && subdriver->suspend)
- ret = subdriver->suspend(intf, message);
+ if (info->subdriver && info->subdriver->suspend)
+ ret = info->subdriver->suspend(intf, message);
if (ret < 0)
usbnet_resume(intf);
err:
@@ -317,16 +326,16 @@ err:
static int qmi_wwan_resume(struct usb_interface *intf)
{
struct usbnet *dev = usb_get_intfdata(intf);
- struct usb_driver *subdriver = (void *)dev->data[0];
+ struct qmi_wwan_state *info = (void *)&dev->data;
int ret = 0;
- if (subdriver && subdriver->resume)
- ret = subdriver->resume(intf);
+ if (info->subdriver && info->subdriver->resume)
+ ret = info->subdriver->resume(intf);
if (ret < 0)
goto err;
ret = usbnet_resume(intf);
- if (ret < 0 && subdriver && subdriver->resume && subdriver->suspend)
- subdriver->suspend(intf, PMSG_SUSPEND);
+ if (ret < 0 && info->subdriver && info->subdriver->resume && info->subdriver->suspend)
+ info->subdriver->suspend(intf, PMSG_SUSPEND);
err:
return ret;
}
--
1.7.10
--
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