usb: gadget: Provide a default implementation of default manufacturer string

Some gadgets provide custom entry here. Some may override it with an
etntry that is also created by composite if there was no value sumbitted
at all.
This patch removes all "custom manufacturer" strings which are the same
as these which are created by composite. Then it moves the creation of
the default manufacturer string to usb_composite_overwrite_options() in
case no command line argument has been used and the entry is still an
empty string.
By doing this we get rid of the global variable "composite_manufacturer"
in composite.

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

18 files changed, 31 insertions, 137 deletions

diff --git a/drivers/usb/gadget/acm_ms.c b/drivers/usb/gadget/acm_ms.c
index 35db6aa5728..d280f164887 100644
--- a/drivers/usb/gadget/acm_ms.c
+++ b/drivers/usb/gadget/acm_ms.c
@@ -15,7 +15,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
 
 #include "u_serial.h"
 
@@ -87,13 +86,9 @@ static const struct usb_descriptor_header *otg_desc[] = {
 	NULL,
 };
 
-
 /* string IDs are assigned dynamically */
-
-static char manufacturer[50];
-
 static struct usb_string strings_dev[] = {
-	[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
 	[USB_GADGET_SERIAL_IDX].s = "",
 	{  } /* end of list */
@@ -186,11 +181,6 @@ static int __init acm_ms_bind(struct usb_composite_dev *cdev)
 	 * Allocate string descriptor numbers ... note that string
 	 * contents can be overridden by the composite_dev glue.
 	 */
-
-	/* device descriptor strings: manufacturer, product */
-	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
-		init_utsname()->sysname, init_utsname()->release,
-		gadget->name);
 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
 		goto fail1;
diff --git a/drivers/usb/gadget/audio.c b/drivers/usb/gadget/audio.c
index 8857b6eeb6a..1f81e0f4fab 100644
--- a/drivers/usb/gadget/audio.c
+++ b/drivers/usb/gadget/audio.c
@@ -12,7 +12,6 @@
 /* #define VERBOSE_DEBUG */
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
 #include <linux/usb/composite.h>
 
 #include "gadget_chips.h"
@@ -33,10 +32,8 @@ USB_GADGET_COMPOSITE_OPTIONS();
 
 /* string IDs are assigned dynamically */
 
-static char manufacturer[50];
-
 static struct usb_string strings_dev[] = {
-	[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
 	[USB_GADGET_SERIAL_IDX].s = "",
 	{  } /* end of list */
@@ -161,10 +158,6 @@ static int __init audio_bind(struct usb_composite_dev *cdev)
 			__constant_cpu_to_le16(0x0300 | 0x0099);
 	}
 
-	/* device descriptor strings: manufacturer, product */
-	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
-		init_utsname()->sysname, init_utsname()->release,
-		cdev->gadget->name);
 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
 		goto fail;
diff --git a/drivers/usb/gadget/cdc2.c b/drivers/usb/gadget/cdc2.c
index 8966bdec153..4e2060bf35e 100644
--- a/drivers/usb/gadget/cdc2.c
+++ b/drivers/usb/gadget/cdc2.c
@@ -11,7 +11,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
 #include <linux/module.h>
 
 #include "u_ether.h"
@@ -90,10 +89,8 @@ static const struct usb_descriptor_header *otg_desc[] = {
 
 
 /* string IDs are assigned dynamically */
-static char manufacturer[50];
-
 static struct usb_string strings_dev[] = {
-	[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
 	[USB_GADGET_SERIAL_IDX].s = "",
 	{  } /* end of list */
@@ -182,15 +179,10 @@ static int __init cdc_bind(struct usb_composite_dev *cdev)
 			cpu_to_le16(0x0300 | 0x0099);
 	}
 
-
 	/* Allocate string descriptor numbers ... note that string
 	 * contents can be overridden by the composite_dev glue.
 	 */
 
-	/* device descriptor strings: manufacturer, product */
-	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
-		init_utsname()->sysname, init_utsname()->release,
-		gadget->name);
 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
 		goto fail1;
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index f3689e1bf4b..c7066cd4c95 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -28,9 +28,6 @@
  * with the relevant device-wide data.
  */
 
-static char composite_manufacturer[50];
-
-/*-------------------------------------------------------------------------*/
 /**
  * next_ep_desc() - advance to the next EP descriptor
  * @t: currect pointer within descriptor array
@@ -860,7 +857,6 @@ static int get_string(struct usb_composite_dev *cdev,
 	struct usb_configuration	*c;
 	struct usb_function		*f;
 	int				len;
-	const char			*str;
 
 	/* Yes, not only is USB's I18N support probably more than most
 	 * folk will ever care about ... also, it's all supported here.
@@ -900,21 +896,6 @@ static int get_string(struct usb_composite_dev *cdev,
 		return s->bLength;
 	}
 
-	/* Otherwise, look up and return a specified string.  First
-	 * check if the string has not been overridden.
-	 */
-	if (cdev->manufacturer_override == id)
-		str = composite_manufacturer;
-	else
-		str = NULL;
-	if (str) {
-		struct usb_gadget_strings strings = {
-			.language = language,
-			.strings  = &(struct usb_string) { 0xff, str }
-		};
-		return usb_gadget_get_string(&strings, 0xff, buf);
-	}
-
 	/* String IDs are device-scoped, so we look up each string
 	 * table we're told about.  These lookups are infrequent;
 	 * simpler-is-better here.
@@ -1367,23 +1348,11 @@ composite_unbind(struct usb_gadget *gadget)
 		usb_ep_free_request(gadget->ep0, cdev->req);
 	}
 	device_remove_file(&gadget->dev, &dev_attr_suspended);
+	kfree(cdev->def_manufacturer);
 	kfree(cdev);
 	set_gadget_data(gadget, NULL);
 }
 
-static u8 override_id(struct usb_composite_dev *cdev, u8 *desc)
-{
-	if (!*desc) {
-		int ret = usb_string_id(cdev);
-		if (unlikely(ret < 0))
-			WARNING(cdev, "failed to override string ID\n");
-		else
-			*desc = ret;
-	}
-
-	return *desc;
-}
-
 static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
 		const struct usb_device_descriptor *old)
 {
@@ -1477,19 +1446,6 @@ static int composite_bind(struct usb_gadget *gadget,
 
 	update_unchanged_dev_desc(&cdev->desc, composite->dev);
 
-	/* string overrides */
-	if (!cdev->desc.iManufacturer) {
-		snprintf(composite_manufacturer,
-				sizeof composite_manufacturer,
-				"%s %s with %s",
-				init_utsname()->sysname,
-				init_utsname()->release,
-				gadget->name);
-
-		cdev->manufacturer_override =
-			override_id(cdev, &cdev->desc.iManufacturer);
-	}
-
 	/* has userspace failed to provide a serial number? */
 	if (composite->needs_serial && !cdev->desc.iSerialNumber)
 		WARNING(cdev, "userspace failed to provide iSerialNumber\n");
@@ -1665,6 +1621,22 @@ void usb_composite_setup_continue(struct usb_composite_dev *cdev)
 	spin_unlock_irqrestore(&cdev->lock, flags);
 }
 
+static char *composite_default_mfr(struct usb_gadget *gadget)
+{
+	char *mfr;
+	int len;
+
+	len = snprintf(NULL, 0, "%s %s with %s", init_utsname()->sysname,
+			init_utsname()->release, gadget->name);
+	len++;
+	mfr = kmalloc(len, GFP_KERNEL);
+	if (!mfr)
+		return NULL;
+	snprintf(mfr, len, "%s %s with %s", init_utsname()->sysname,
+			init_utsname()->release, gadget->name);
+	return mfr;
+}
+
 void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
 		struct usb_composite_overwrite *covr)
 {
@@ -1688,6 +1660,11 @@ void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
 	if (covr->manufacturer) {
 		desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
 		dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer;
+
+	} else if (!strlen(dev_str[USB_GADGET_MANUFACTURER_IDX].s)) {
+		desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
+		cdev->def_manufacturer = composite_default_mfr(cdev->gadget);
+		dev_str[USB_GADGET_MANUFACTURER_IDX].s = cdev->def_manufacturer;
 	}
 
 	if (covr->product) {
diff --git a/drivers/usb/gadget/ether.c b/drivers/usb/gadget/ether.c
index dd5e00d207f..a5c27206762 100644
--- a/drivers/usb/gadget/ether.c
+++ b/drivers/usb/gadget/ether.c
@@ -14,8 +14,6 @@
 /* #define VERBOSE_DEBUG */
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
-
 
 #if defined USB_ETH_RNDIS
 #  undef USB_ETH_RNDIS
@@ -193,11 +191,8 @@ static const struct usb_descriptor_header *otg_desc[] = {
 	NULL,
 };
 
-/* string IDs are assigned dynamically */
-static char manufacturer[50];
-
 static struct usb_string strings_dev[] = {
-	[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = PREFIX DRIVER_DESC,
 	[USB_GADGET_SERIAL_IDX].s = "",
 	{  } /* end of list */
@@ -333,15 +328,10 @@ static int __init eth_bind(struct usb_composite_dev *cdev)
 			cpu_to_le16(0x0300 | 0x0099);
 	}
 
-
 	/* Allocate string descriptor numbers ... note that string
 	 * contents can be overridden by the composite_dev glue.
 	 */
 
-	/* device descriptor strings: manufacturer, product */
-	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
-		init_utsname()->sysname, init_utsname()->release,
-		gadget->name);
 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
 		goto fail;
diff --git a/drivers/usb/gadget/f_hid.c b/drivers/usb/gadget/f_hid.c
index 16a8b1c15c6..77dbca099bc 100644
--- a/drivers/usb/gadget/f_hid.c
+++ b/drivers/usb/gadget/f_hid.c
@@ -10,7 +10,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
 #include <linux/module.h>
 #include <linux/hid.h>
 #include <linux/cdev.h>
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 4f1142efa6d..11150960d88 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -213,7 +213,6 @@
 #include <linux/spinlock.h>
 #include <linux/string.h>
 #include <linux/freezer.h>
-#include <linux/utsname.h>
 
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
diff --git a/drivers/usb/gadget/f_midi.c b/drivers/usb/gadget/f_midi.c
index 2f7e8f2930c..8ed1259fe80 100644
--- a/drivers/usb/gadget/f_midi.c
+++ b/drivers/usb/gadget/f_midi.c
@@ -21,7 +21,6 @@
 
 #include <linux/kernel.h>
 #include <linux/slab.h>
-#include <linux/utsname.h>
 #include <linux/device.h>
 
 #include <sound/core.h>
diff --git a/drivers/usb/gadget/g_ffs.c b/drivers/usb/gadget/g_ffs.c
index eaaed199e45..9e62c20fb5b 100644
--- a/drivers/usb/gadget/g_ffs.c
+++ b/drivers/usb/gadget/g_ffs.c
@@ -13,7 +13,6 @@
 #define pr_fmt(fmt) "g_ffs: " fmt
 
 #include <linux/module.h>
-#include <linux/utsname.h>
 
 /*
  * kbuild is not very cooperative with respect to linking separately
diff --git a/drivers/usb/gadget/gmidi.c b/drivers/usb/gadget/gmidi.c
index 2ee3a74056c..59621ef7657 100644
--- a/drivers/usb/gadget/gmidi.c
+++ b/drivers/usb/gadget/gmidi.c
@@ -22,7 +22,6 @@
 
 #include <linux/kernel.h>
 #include <linux/slab.h>
-#include <linux/utsname.h>
 #include <linux/module.h>
 #include <linux/device.h>
 
diff --git a/drivers/usb/gadget/hid.c b/drivers/usb/gadget/hid.c
index 16caf50e916..0e2e357cc59 100644
--- a/drivers/usb/gadget/hid.c
+++ b/drivers/usb/gadget/hid.c
@@ -91,10 +91,8 @@ static const struct usb_descriptor_header *otg_desc[] = {
 
 
 /* string IDs are assigned dynamically */
-static char manufacturer[50];
-
 static struct usb_string strings_dev[] = {
-	[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
 	[USB_GADGET_SERIAL_IDX].s = "",
 	{  } /* end of list */
@@ -165,16 +163,10 @@ static int __init hid_bind(struct usb_composite_dev *cdev)
 	else
 		device_desc.bcdDevice = cpu_to_le16(0x0300 | 0x0099);
 
-
 	/* Allocate string descriptor numbers ... note that string
 	 * contents can be overridden by the composite_dev glue.
 	 */
 
-	/* device descriptor strings: manufacturer, product */
-	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
-		init_utsname()->sysname, init_utsname()->release,
-		gadget->name);
-
 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
 		return status;
diff --git a/drivers/usb/gadget/mass_storage.c b/drivers/usb/gadget/mass_storage.c
index 50da3c88cb0..9eb2be68580 100644
--- a/drivers/usb/gadget/mass_storage.c
+++ b/drivers/usb/gadget/mass_storage.c
@@ -29,10 +29,8 @@
 
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
 #include <linux/usb/ch9.h>
 
-
 /*-------------------------------------------------------------------------*/
 
 #define DRIVER_DESC		"Mass Storage Gadget"
diff --git a/drivers/usb/gadget/multi.c b/drivers/usb/gadget/multi.c
index c158706b5ab..5bc5d96beaa 100644
--- a/drivers/usb/gadget/multi.c
+++ b/drivers/usb/gadget/multi.c
@@ -14,10 +14,8 @@
 
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
 #include <linux/module.h>
 
-
 #if defined USB_ETH_RNDIS
 #  undef USB_ETH_RNDIS
 #endif
diff --git a/drivers/usb/gadget/ncm.c b/drivers/usb/gadget/ncm.c
index 1a26452ce4c..343f3d364ef 100644
--- a/drivers/usb/gadget/ncm.c
+++ b/drivers/usb/gadget/ncm.c
@@ -20,8 +20,6 @@
 /* #define VERBOSE_DEBUG */
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
-
 
 #include "u_ether.h"
 
@@ -95,12 +93,9 @@ static const struct usb_descriptor_header *otg_desc[] = {
 	NULL,
 };
 
-
 /* string IDs are assigned dynamically */
-static char manufacturer[50];
-
 static struct usb_string strings_dev[] = {
-	[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
 	[USB_GADGET_SERIAL_IDX].s = "",
 	{  } /* end of list */
@@ -169,15 +164,10 @@ static int __init gncm_bind(struct usb_composite_dev *cdev)
 			cpu_to_le16(0x0300 | 0x0099);
 	}
 
-
 	/* Allocate string descriptor numbers ... note that string
 	 * contents can be overridden by the composite_dev glue.
 	 */
 
-	/* device descriptor strings: manufacturer, product */
-	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
-		init_utsname()->sysname, init_utsname()->release,
-		gadget->name);
 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
 		goto fail;
diff --git a/drivers/usb/gadget/nokia.c b/drivers/usb/gadget/nokia.c
index 34b97f12b7d..465766e4144 100644
--- a/drivers/usb/gadget/nokia.c
+++ b/drivers/usb/gadget/nokia.c
@@ -16,7 +16,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
 #include <linux/device.h>
 
 #include "u_serial.h"
diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index 3321a9df486..9bd994203d3 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -22,7 +22,6 @@
 #include <linux/timer.h>
 #include <linux/list.h>
 #include <linux/interrupt.h>
-#include <linux/utsname.h>
 #include <linux/device.h>
 #include <linux/moduleparam.h>
 #include <linux/fs.h>
@@ -237,7 +236,6 @@ static const struct usb_descriptor_header *otg_desc[] = {
 
 /* descriptors that are built on-demand */
 
-static char				manufacturer [50];
 static char				product_desc [40] = DRIVER_DESC;
 static char				serial_num [40] = "1";
 static char				pnp_string [1024] =
@@ -245,7 +243,7 @@ static char				pnp_string [1024] =
 
 /* static strings, in UTF-8 */
 static struct usb_string		strings [] = {
-	[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = product_desc,
 	[USB_GADGET_SERIAL_IDX].s =	serial_num,
 	{  }		/* end of list */
@@ -1165,10 +1163,6 @@ static int __init printer_bind_config(struct usb_configuration *c)
 		device_desc.bcdDevice =
 			cpu_to_le16(0xFFFF);
 	}
-	snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
-		init_utsname()->sysname, init_utsname()->release,
-		gadget->name);
-
 	if (iPNPstring)
 		strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
 
diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index 768a38e896f..bf12d55cd07 100644
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -11,7 +11,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/utsname.h>
 #include <linux/device.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
@@ -61,10 +60,8 @@ USB_GADGET_COMPOSITE_OPTIONS();
 
 #define STRING_DESCRIPTION_IDX		USB_GADGET_FIRST_AVAIL_IDX
 
-static char manufacturer[50];
-
 static struct usb_string strings_dev[] = {
-	[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = GS_VERSION_NAME,
 	[USB_GADGET_SERIAL_IDX].s = "",
 	[STRING_DESCRIPTION_IDX].s = NULL /* updated; f(use_acm) */,
@@ -171,10 +168,6 @@ static int __init gs_bind(struct usb_composite_dev *cdev)
 	 * contents can be overridden by the composite_dev glue.
 	 */
 
-	/* device description: manufacturer, product */
-	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
-		init_utsname()->sysname, init_utsname()->release,
-		gadget->name);
 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
 		goto fail;
diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index ee769c45498..a837f3af204 100644
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -42,7 +42,6 @@
 
 #include <linux/kernel.h>
 #include <linux/slab.h>
-#include <linux/utsname.h>
 #include <linux/device.h>
 
 #include "g_zero.h"
@@ -139,13 +138,11 @@ const struct usb_descriptor_header *otg_desc[] = {
 #endif
 
 /* string IDs are assigned dynamically */
-static char manufacturer[50];
-
 /* default serial number takes at least two packets */
 static char serial[] = "0123456789.0123456789.0123456789";
 
 static struct usb_string strings_dev[] = {
-	[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = longname,
 	[USB_GADGET_SERIAL_IDX].s = serial,
 	{  }			/* end of list */
@@ -305,10 +302,6 @@ static int __init zero_bind(struct usb_composite_dev *cdev)
 
 	INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
 
-	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
-		init_utsname()->sysname, init_utsname()->release,
-		gadget->name);
-
 	return 0;
 }