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Commit 4f62efe6 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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[PATCH] usbcore: Fix handling of sysfs strings and other attributes 



This patch (as592) makes a few small improvements to the way device
strings are handled, and it fixes some bugs in a couple of other sysfs
attribute routines.  (Look at show_configuration_string() to see what I
mean.)

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 16f16d11

drivers/usb/core/config.c

+6 −4
Original line number Diff line number Diff line
@@ -112,8 +112,12 @@ void usb_release_interface_cache(struct kref *ref) 
	struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);

	int j;



	for (j = 0; j < intfc->num_altsetting; j++)

		kfree(intfc->altsetting[j].endpoint);

	for (j = 0; j < intfc->num_altsetting; j++) {

		struct usb_host_interface *alt = &intfc->altsetting[j];



		kfree(alt->endpoint);

		kfree(alt->string);

	}

	kfree(intfc);

}
@@ -420,8 +424,6 @@ void usb_destroy_configuration(struct usb_device *dev) 
		struct usb_host_config *cf = &dev->config[c];



		kfree(cf->string);

		cf->string = NULL;



		for (i = 0; i < cf->desc.bNumInterfaces; i++) {

			if (cf->intf_cache[i])

				kref_put(&cf->intf_cache[i]->ref,

drivers/usb/core/hub.c

+4 −18
Original line number Diff line number Diff line
@@ -1204,21 +1204,6 @@ static inline void show_string(struct usb_device *udev, char *id, char *string) 
{}

#endif



static void get_string(struct usb_device *udev, char **string, int index)

{

	char *buf;



	if (!index)

		return;

	buf = kmalloc(256, GFP_KERNEL);

	if (!buf)

		return;

	if (usb_string(udev, index, buf, 256) > 0)

		*string = buf;

	else

		kfree(buf);

}





#ifdef	CONFIG_USB_OTG

#include "otg_whitelist.h"
@@ -1257,9 +1242,10 @@ int usb_new_device(struct usb_device *udev) 
	}



	/* read the standard strings and cache them if present */

	get_string(udev, &udev->product, udev->descriptor.iProduct);

	get_string(udev, &udev->manufacturer, udev->descriptor.iManufacturer);

	get_string(udev, &udev->serial, udev->descriptor.iSerialNumber);

	udev->product = usb_cache_string(udev, udev->descriptor.iProduct);

	udev->manufacturer = usb_cache_string(udev,

			udev->descriptor.iManufacturer);

	udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);



	/* Tell the world! */

	dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "

drivers/usb/core/message.c

+30 −18
Original line number Diff line number Diff line
@@ -787,6 +787,31 @@ int usb_string(struct usb_device *dev, int index, char *buf, size_t size) 
	return err;

}



/**

 * usb_cache_string - read a string descriptor and cache it for later use

 * @udev: the device whose string descriptor is being read

 * @index: the descriptor index

 *

 * Returns a pointer to a kmalloc'ed buffer containing the descriptor string,

 * or NULL if the index is 0 or the string could not be read.

 */

char *usb_cache_string(struct usb_device *udev, int index)

{

	char *buf;

	char *smallbuf = NULL;

	int len;



	if (index > 0 && (buf = kmalloc(256, GFP_KERNEL)) != NULL) {

		if ((len = usb_string(udev, index, buf, 256)) > 0) {

			if ((smallbuf = kmalloc(++len, GFP_KERNEL)) == NULL)

				return buf;

			memcpy(smallbuf, buf, len);

		}

		kfree(buf);

	}

	return smallbuf;

}



/*

 * usb_get_device_descriptor - (re)reads the device descriptor (usbcore)

 * @dev: the device whose device descriptor is being updated
@@ -1008,8 +1033,6 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0) 
			dev_dbg (&dev->dev, "unregistering interface %s\n",

				interface->dev.bus_id);

			usb_remove_sysfs_intf_files(interface);

			kfree(interface->cur_altsetting->string);

			interface->cur_altsetting->string = NULL;

			device_del (&interface->dev);

		}
@@ -1422,12 +1445,9 @@ free_interfaces: 
		}

		kfree(new_interfaces);



		if ((cp->desc.iConfiguration) &&

		    (cp->string == NULL)) {

			cp->string = kmalloc(256, GFP_KERNEL);

			if (cp->string)

				usb_string(dev, cp->desc.iConfiguration, cp->string, 256);

		}

		if (cp->string == NULL)

			cp->string = usb_cache_string(dev,

					cp->desc.iConfiguration);



		/* Now that all the interfaces are set up, register them

		 * to trigger binding of drivers to interfaces.  probe()
@@ -1437,13 +1457,12 @@ free_interfaces: 
		 */

		for (i = 0; i < nintf; ++i) {

			struct usb_interface *intf = cp->interface[i];

			struct usb_interface_descriptor *desc;

			struct usb_host_interface *alt = intf->cur_altsetting;



			desc = &intf->altsetting [0].desc;

			dev_dbg (&dev->dev,

				"adding %s (config #%d, interface %d)\n",

				intf->dev.bus_id, configuration,

				desc->bInterfaceNumber);

				alt->desc.bInterfaceNumber);

			ret = device_add (&intf->dev);

			if (ret != 0) {

				dev_err(&dev->dev,
@@ -1452,13 +1471,6 @@ free_interfaces: 
					ret);

				continue;

			}

			if ((intf->cur_altsetting->desc.iInterface) &&

			    (intf->cur_altsetting->string == NULL)) {

				intf->cur_altsetting->string = kmalloc(256, GFP_KERNEL);

				if (intf->cur_altsetting->string)

					usb_string(dev, intf->cur_altsetting->desc.iInterface,

						   intf->cur_altsetting->string, 256);

			}

			usb_create_sysfs_intf_files (intf);

		}

	}

drivers/usb/core/sysfs.c

+15 −21
Original line number Diff line number Diff line
@@ -249,18 +249,12 @@ static ssize_t show_configuration_string(struct device *dev, 
{

	struct usb_device *udev;

	struct usb_host_config *actconfig;

	int len;



	udev = to_usb_device (dev);

	actconfig = udev->actconfig;

	if ((!actconfig) || (!actconfig->string))

		return 0;

	len = sprintf(buf, actconfig->string, PAGE_SIZE);

	if (len < 0)

		return 0;

	buf[len] = '\n';

	buf[len+1] = 0;

	return len+1;

	return sprintf(buf, "%s\n", actconfig->string);

}

static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
@@ -291,15 +285,9 @@ static ssize_t show_##name(struct device *dev, \ 
		struct device_attribute *attr, char *buf)		\

{									\

	struct usb_device *udev;					\

	int len;							\

									\

	udev = to_usb_device (dev);					\

	len = snprintf(buf, 256, "%s", udev->name);			\

	if (len < 0)							\

		return 0;						\

	buf[len] = '\n';						\

	buf[len+1] = 0;							\

	return len+1;							\

	return sprintf(buf, "%s\n", udev->name);			\

}									\

static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
@@ -449,11 +437,11 @@ void usb_remove_sysfs_dev_files (struct usb_device *udev) 
	usb_remove_ep_files(&udev->ep0);

	sysfs_remove_group(&dev->kobj, &dev_attr_grp);



	if (udev->descriptor.iManufacturer)

	if (udev->manufacturer)

		device_remove_file(dev, &dev_attr_manufacturer);

	if (udev->descriptor.iProduct)

	if (udev->product)

		device_remove_file(dev, &dev_attr_product);

	if (udev->descriptor.iSerialNumber)

	if (udev->serial)

		device_remove_file(dev, &dev_attr_serial);

	device_remove_file (dev, &dev_attr_configuration);

}
@@ -535,7 +523,8 @@ static struct attribute_group intf_attr_grp = { 
	.attrs = intf_attrs,

};



static inline void usb_create_intf_ep_files(struct usb_interface *intf)

static inline void usb_create_intf_ep_files(struct usb_interface *intf,

		struct usb_device *udev)

{

	struct usb_host_interface *iface_desc;

	int i;
@@ -543,7 +532,7 @@ static inline void usb_create_intf_ep_files(struct usb_interface *intf) 
	iface_desc = intf->cur_altsetting;

	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)

		usb_create_ep_files(&intf->dev.kobj, &iface_desc->endpoint[i],

				interface_to_usbdev(intf));

				udev);

}



static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
@@ -558,11 +547,16 @@ static inline void usb_remove_intf_ep_files(struct usb_interface *intf) 


void usb_create_sysfs_intf_files (struct usb_interface *intf)

{

	struct usb_device *udev = interface_to_usbdev(intf);

	struct usb_host_interface *alt = intf->cur_altsetting;



	sysfs_create_group(&intf->dev.kobj, &intf_attr_grp);



	if (intf->cur_altsetting->string)

	if (alt->string == NULL)

		alt->string = usb_cache_string(udev, alt->desc.iInterface);

	if (alt->string)

		device_create_file(&intf->dev, &dev_attr_interface);

	usb_create_intf_ep_files(intf);

	usb_create_intf_ep_files(intf, udev);

}



void usb_remove_sysfs_intf_files (struct usb_interface *intf)

drivers/usb/core/usb.h

+1 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ extern void usb_disable_device (struct usb_device *dev, int skip_ep0); 


extern int usb_get_device_descriptor(struct usb_device *dev,

		unsigned int size);

extern char *usb_cache_string(struct usb_device *udev, int index);

extern int usb_set_configuration(struct usb_device *dev, int configuration);



extern void usb_lock_all_devices(void);