[PATCH 0/4] tablet: remove private copy to USB device

[PATCH 0/4] tablet: remove private copy to USB device

[Oliver Neukum]

We now have a macro to easily get to the USB device from the interface.
So we are cleaning up all drivers to not store a private pointer.

Oliver Neukum (4):
  acecad: stop saving struct usb_device
  aiptek: stop saving struct usb_device
  gtco: stop saving struct usb_device
  kbtab: stop saving struct usb_device

 drivers/input/tablet/acecad.c | 12 ++++++------
 drivers/input/tablet/aiptek.c | 18 +++++++++---------
 drivers/input/tablet/gtco.c   | 24 ++++++++++++------------
 drivers/input/tablet/kbtab.c  |  8 ++++----
 4 files changed, 31 insertions(+), 31 deletions(-)

-- 
2.1.4

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[PATCH 1/4] acecad: stop saving struct usb_device

[Oliver Neukum]

The device can now easily be derived from the interface.
Stop leaving a private copy.

Signed-off-by: Oliver Neukum <ONeukum@suse.com>
---
 drivers/input/tablet/acecad.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/input/tablet/acecad.c b/drivers/input/tablet/acecad.c
index 889f6b7..e86e377 100644
--- a/drivers/input/tablet/acecad.c
+++ b/drivers/input/tablet/acecad.c
@@ -49,7 +49,6 @@ MODULE_LICENSE(DRIVER_LICENSE);
 struct usb_acecad {
 	char name[128];
 	char phys[64];
-	struct usb_device *usbdev;
 	struct usb_interface *intf;
 	struct input_dev *input;
 	struct urb *irq;
@@ -64,6 +63,7 @@ static void usb_acecad_irq(struct urb *urb)
 	unsigned char *data = acecad->data;
 	struct input_dev *dev = acecad->input;
 	struct usb_interface *intf = acecad->intf;
+	struct usb_device *udev = interface_to_usbdev(intf);
 	int prox, status;
 
 	switch (urb->status) {
@@ -110,15 +110,15 @@ resubmit:
 	if (status)
 		dev_err(&intf->dev,
 			"can't resubmit intr, %s-%s/input0, status %d\n",
-			acecad->usbdev->bus->bus_name,
-			acecad->usbdev->devpath, status);
+			udev->bus->bus_name,
+			udev->devpath, status);
 }
 
 static int usb_acecad_open(struct input_dev *dev)
 {
 	struct usb_acecad *acecad = input_get_drvdata(dev);
 
-	acecad->irq->dev = acecad->usbdev;
+	acecad->irq->dev = interface_to_usbdev(acecad->intf);
 	if (usb_submit_urb(acecad->irq, GFP_KERNEL))
 		return -EIO;
 
@@ -172,7 +172,6 @@ static int usb_acecad_probe(struct usb_interface *intf, const struct usb_device_
 		goto fail2;
 	}
 
-	acecad->usbdev = dev;
 	acecad->intf = intf;
 	acecad->input = input_dev;
 
@@ -251,12 +250,13 @@ static int usb_acecad_probe(struct usb_interface *intf, const struct usb_device_
 static void usb_acecad_disconnect(struct usb_interface *intf)
 {
 	struct usb_acecad *acecad = usb_get_intfdata(intf);
+	struct usb_device *udev = interface_to_usbdev(intf);
 
 	usb_set_intfdata(intf, NULL);
 
 	input_unregister_device(acecad->input);
 	usb_free_urb(acecad->irq);
-	usb_free_coherent(acecad->usbdev, 8, acecad->data, acecad->data_dma);
+	usb_free_coherent(udev, 8, acecad->data, acecad->data_dma);
 	kfree(acecad);
 }
 
-- 
2.1.4

[PATCH 2/4] aiptek: stop saving struct usb_device

[Oliver Neukum]

The device can now easily be derived from the interface.
Stop leaving a private copy.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/input/tablet/aiptek.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/input/tablet/aiptek.c b/drivers/input/tablet/aiptek.c
index 78ca448..ee80c11 100644
--- a/drivers/input/tablet/aiptek.c
+++ b/drivers/input/tablet/aiptek.c
@@ -307,7 +307,6 @@ struct aiptek_settings {
 
 struct aiptek {
 	struct input_dev *inputdev;		/* input device struct           */
-	struct usb_device *usbdev;		/* usb device struct             */
 	struct usb_interface *intf;		/* usb interface struct          */
 	struct urb *urb;			/* urb for incoming reports      */
 	dma_addr_t data_dma;			/* our dma stuffage              */
@@ -847,7 +846,7 @@ static int aiptek_open(struct input_dev *inputdev)
 {
 	struct aiptek *aiptek = input_get_drvdata(inputdev);
 
-	aiptek->urb->dev = aiptek->usbdev;
+	aiptek->urb->dev = interface_to_usbdev(aiptek->intf);;
 	if (usb_submit_urb(aiptek->urb, GFP_KERNEL) != 0)
 		return -EIO;
 
@@ -873,8 +872,9 @@ aiptek_set_report(struct aiptek *aiptek,
 		  unsigned char report_type,
 		  unsigned char report_id, void *buffer, int size)
 {
-	return usb_control_msg(aiptek->usbdev,
-			       usb_sndctrlpipe(aiptek->usbdev, 0),
+	struct usb_device *udev = interface_to_usbdev(aiptek->intf);
+	return usb_control_msg(udev,
+			       usb_sndctrlpipe(udev, 0),
 			       USB_REQ_SET_REPORT,
 			       USB_TYPE_CLASS | USB_RECIP_INTERFACE |
 			       USB_DIR_OUT, (report_type << 8) + report_id,
@@ -886,8 +886,9 @@ aiptek_get_report(struct aiptek *aiptek,
 		  unsigned char report_type,
 		  unsigned char report_id, void *buffer, int size)
 {
-	return usb_control_msg(aiptek->usbdev,
-			       usb_rcvctrlpipe(aiptek->usbdev, 0),
+	struct usb_device *udev = interface_to_usbdev(aiptek->intf);
+	return usb_control_msg(udev,
+			       usb_rcvctrlpipe(udev, 0),
 			       USB_REQ_GET_REPORT,
 			       USB_TYPE_CLASS | USB_RECIP_INTERFACE |
 			       USB_DIR_IN, (report_type << 8) + report_id,
@@ -1729,7 +1730,6 @@ aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	}
 
 	aiptek->inputdev = inputdev;
-	aiptek->usbdev = usbdev;
 	aiptek->intf = intf;
 	aiptek->ifnum = intf->altsetting[0].desc.bInterfaceNumber;
 	aiptek->inDelay = 0;
@@ -1833,8 +1833,8 @@ aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	 * input.
 	 */
 	usb_fill_int_urb(aiptek->urb,
-			 aiptek->usbdev,
-			 usb_rcvintpipe(aiptek->usbdev,
+			 usbdev,
+			 usb_rcvintpipe(usbdev,
 					endpoint->bEndpointAddress),
 			 aiptek->data, 8, aiptek_irq, aiptek,
 			 endpoint->bInterval);
-- 
2.1.4

[PATCH 3/4] gtco: stop saving struct usb_device

[Oliver Neukum]

The device can now easily be derived from the interface.
Stop leaving a private copy.

Signed-off-by: Oliver Neukum <oneukum-IBi9RG/b67k@public.gmane.org>
---
 drivers/input/tablet/gtco.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c
index 3a7f3a4..362ae3b 100644
--- a/drivers/input/tablet/gtco.c
+++ b/drivers/input/tablet/gtco.c
@@ -104,7 +104,6 @@ MODULE_DEVICE_TABLE (usb, gtco_usbid_table);
 struct gtco {
 
 	struct input_dev  *inputdevice; /* input device struct pointer  */
-	struct usb_device *usbdev; /* the usb device for this device */
 	struct usb_interface *intf;	/* the usb interface for this device */
 	struct urb        *urbinfo;	 /* urb for incoming reports      */
 	dma_addr_t        buf_dma;  /* dma addr of the data buffer*/
@@ -540,7 +539,7 @@ static int gtco_input_open(struct input_dev *inputdev)
 {
 	struct gtco *device = input_get_drvdata(inputdev);
 
-	device->urbinfo->dev = device->usbdev;
+	device->urbinfo->dev = interface_to_usbdev(device->intf);
 	if (usb_submit_urb(device->urbinfo, GFP_KERNEL))
 		return -EIO;
 
@@ -824,6 +823,7 @@ static int gtco_probe(struct usb_interface *usbinterface,
 	int                     result = 0, retry;
 	int			error;
 	struct usb_endpoint_descriptor *endpoint;
+	struct usb_device	*udev = interface_to_usbdev(usbinterface);
 
 	/* Allocate memory for device structure */
 	gtco = kzalloc(sizeof(struct gtco), GFP_KERNEL);
@@ -838,11 +838,10 @@ static int gtco_probe(struct usb_interface *usbinterface,
 	gtco->inputdevice = input_dev;
 
 	/* Save interface information */
-	gtco->usbdev = interface_to_usbdev(usbinterface);
 	gtco->intf = usbinterface;
 
 	/* Allocate some data for incoming reports */
-	gtco->buffer = usb_alloc_coherent(gtco->usbdev, REPORT_MAX_SIZE,
+	gtco->buffer = usb_alloc_coherent(udev, REPORT_MAX_SIZE,
 					  GFP_KERNEL, &gtco->buf_dma);
 	if (!gtco->buffer) {
 		dev_err(&usbinterface->dev, "No more memory for us buffers\n");
@@ -899,8 +898,8 @@ static int gtco_probe(struct usb_interface *usbinterface,
 
 	/* Couple of tries to get reply */
 	for (retry = 0; retry < 3; retry++) {
-		result = usb_control_msg(gtco->usbdev,
-					 usb_rcvctrlpipe(gtco->usbdev, 0),
+		result = usb_control_msg(udev,
+					 usb_rcvctrlpipe(udev, 0),
 					 USB_REQ_GET_DESCRIPTOR,
 					 USB_RECIP_INTERFACE | USB_DIR_IN,
 					 REPORT_DEVICE_TYPE << 8,
@@ -928,7 +927,7 @@ static int gtco_probe(struct usb_interface *usbinterface,
 	}
 
 	/* Create a device file node */
-	usb_make_path(gtco->usbdev, gtco->usbpath, sizeof(gtco->usbpath));
+	usb_make_path(udev, gtco->usbpath, sizeof(gtco->usbpath));
 	strlcat(gtco->usbpath, "/input0", sizeof(gtco->usbpath));
 
 	/* Set Input device functions */
@@ -945,15 +944,15 @@ static int gtco_probe(struct usb_interface *usbinterface,
 	gtco_setup_caps(input_dev);
 
 	/* Set input device required ID information */
-	usb_to_input_id(gtco->usbdev, &input_dev->id);
+	usb_to_input_id(udev, &input_dev->id);
 	input_dev->dev.parent = &usbinterface->dev;
 
 	/* Setup the URB, it will be posted later on open of input device */
 	endpoint = &usbinterface->altsetting[0].endpoint[0].desc;
 
 	usb_fill_int_urb(gtco->urbinfo,
-			 gtco->usbdev,
-			 usb_rcvintpipe(gtco->usbdev,
+			 udev,
+			 usb_rcvintpipe(udev,
 					endpoint->bEndpointAddress),
 			 gtco->buffer,
 			 REPORT_MAX_SIZE,
@@ -977,7 +976,7 @@ static int gtco_probe(struct usb_interface *usbinterface,
  err_free_urb:
 	usb_free_urb(gtco->urbinfo);
  err_free_buf:
-	usb_free_coherent(gtco->usbdev, REPORT_MAX_SIZE,
+	usb_free_coherent(udev, REPORT_MAX_SIZE,
 			  gtco->buffer, gtco->buf_dma);
  err_free_devs:
 	input_free_device(input_dev);
@@ -994,13 +993,14 @@ static void gtco_disconnect(struct usb_interface *interface)
 {
 	/* Grab private device ptr */
 	struct gtco *gtco = usb_get_intfdata(interface);
+	struct usb_device *udev = interface_to_usbdev(interface);
 
 	/* Now reverse all the registration stuff */
 	if (gtco) {
 		input_unregister_device(gtco->inputdevice);
 		usb_kill_urb(gtco->urbinfo);
 		usb_free_urb(gtco->urbinfo);
-		usb_free_coherent(gtco->usbdev, REPORT_MAX_SIZE,
+		usb_free_coherent(udev, REPORT_MAX_SIZE,
 				  gtco->buffer, gtco->buf_dma);
 		kfree(gtco);
 	}
-- 
2.1.4

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[PATCH 4/4] kbtab: stop saving struct usb_device

[Oliver Neukum]

The device can now easily be derived from the interface.
Stop leaving a private copy.

Signed-off-by: Oliver Neukum <ONeukum@suse.com>
---
 drivers/input/tablet/kbtab.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/input/tablet/kbtab.c b/drivers/input/tablet/kbtab.c
index d2ac7c2..e850d7e 100644
--- a/drivers/input/tablet/kbtab.c
+++ b/drivers/input/tablet/kbtab.c
@@ -31,7 +31,6 @@ struct kbtab {
 	unsigned char *data;
 	dma_addr_t data_dma;
 	struct input_dev *dev;
-	struct usb_device *usbdev;
 	struct usb_interface *intf;
 	struct urb *irq;
 	char phys[32];
@@ -99,8 +98,9 @@ MODULE_DEVICE_TABLE(usb, kbtab_ids);
 static int kbtab_open(struct input_dev *dev)
 {
 	struct kbtab *kbtab = input_get_drvdata(dev);
+	struct usb_device *udev = interface_to_usbdev(kbtab->intf);
 
-	kbtab->irq->dev = kbtab->usbdev;
+	kbtab->irq->dev = udev;
 	if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
 		return -EIO;
 
@@ -135,7 +135,6 @@ static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *i
 	if (!kbtab->irq)
 		goto fail2;
 
-	kbtab->usbdev = dev;
 	kbtab->intf = intf;
 	kbtab->dev = input_dev;
 
@@ -188,12 +187,13 @@ static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *i
 static void kbtab_disconnect(struct usb_interface *intf)
 {
 	struct kbtab *kbtab = usb_get_intfdata(intf);
+	struct usb_device *udev = interface_to_usbdev(intf);
 
 	usb_set_intfdata(intf, NULL);
 
 	input_unregister_device(kbtab->dev);
 	usb_free_urb(kbtab->irq);
-	usb_free_coherent(kbtab->usbdev, 8, kbtab->data, kbtab->data_dma);
+	usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma);
 	kfree(kbtab);
 }
 
-- 
2.1.4

Re: [PATCH 2/4] aiptek: stop saving struct usb_device

[kbuild test robot]

Hi Oliver,

[auto build test WARNING on input/next]
[also build test WARNING on v4.5 next-20160322]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Oliver-Neukum/tablet-remove-private-copy-to-USB-device/20160322-231333
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next


coccinelle warnings: (new ones prefixed by >>)

>> drivers/input/tablet/aiptek.c:849:54-55: Unneeded semicolon

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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[PATCH] aiptek: fix semicolon.cocci warnings

[kbuild test robot]

drivers/input/tablet/aiptek.c:849:54-55: Unneeded semicolon


 Remove unneeded semicolon.

Generated by: scripts/coccinelle/misc/semicolon.cocci

CC: Oliver Neukum <oneukum-IBi9RG/b67k@public.gmane.org>
Signed-off-by: Fengguang Wu <fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---

 aiptek.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/input/tablet/aiptek.c
+++ b/drivers/input/tablet/aiptek.c
@@ -846,7 +846,7 @@ static int aiptek_open(struct input_dev
 {
 	struct aiptek *aiptek = input_get_drvdata(inputdev);
 
-	aiptek->urb->dev = interface_to_usbdev(aiptek->intf);;
+	aiptek->urb->dev = interface_to_usbdev(aiptek->intf);
 	if (usb_submit_urb(aiptek->urb, GFP_KERNEL) != 0)
 		return -EIO;
 
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Re: [PATCH 0/4] tablet: remove private copy to USB device

[Dmitry Torokhov]

On Tue, Mar 22, 2016 at 04:04:53PM +0100, Oliver Neukum wrote:
> We now have a macro to easily get to the USB device from the interface.
> So we are cleaning up all drivers to not store a private pointer.

Applied all 4, thank you.

> 
> Oliver Neukum (4):
>   acecad: stop saving struct usb_device
>   aiptek: stop saving struct usb_device
>   gtco: stop saving struct usb_device
>   kbtab: stop saving struct usb_device
> 
>  drivers/input/tablet/acecad.c | 12 ++++++------
>  drivers/input/tablet/aiptek.c | 18 +++++++++---------
>  drivers/input/tablet/gtco.c   | 24 ++++++++++++------------
>  drivers/input/tablet/kbtab.c  |  8 ++++----
>  4 files changed, 31 insertions(+), 31 deletions(-)
> 
> -- 
> 2.1.4
> 

-- 
Dmitry

Re: [PATCH 1/4] acecad: stop saving struct usb_device

[Dmitry Torokhov]

On Tue, Mar 22, 2016 at 04:04:54PM +0100, Oliver Neukum wrote:
>  static int usb_acecad_open(struct input_dev *dev)
>  {
>  	struct usb_acecad *acecad = input_get_drvdata(dev);
>  
> -	acecad->irq->dev = acecad->usbdev;
> +	acecad->irq->dev = interface_to_usbdev(acecad->intf);

By the way, do we still need to do this assignment before submitting
urb?

>  	if (usb_submit_urb(acecad->irq, GFP_KERNEL))
>  		return -EIO;
>  

Thanks.

-- 
Dmitry
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