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-rw-r--r--drivers/hid/usbhid/hid-core.c58
-rw-r--r--drivers/hid/usbhid/usbhid.h2
-rw-r--r--include/linux/hid.h1
3 files changed, 44 insertions, 17 deletions
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 42bdd83444c..3b1c489998c 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -20,6 +20,7 @@
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
+#include <linux/mutex.h>
#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <asm/unaligned.h>
@@ -776,21 +777,10 @@ static int usbhid_start(struct hid_device *hid)
struct usb_interface *intf = to_usb_interface(hid->dev.parent);
struct usb_host_interface *interface = intf->cur_altsetting;
struct usb_device *dev = interface_to_usbdev(intf);
- struct usbhid_device *usbhid;
+ struct usbhid_device *usbhid = hid->driver_data;
unsigned int n, insize = 0;
int ret;
- WARN_ON(hid->driver_data);
-
- usbhid = kzalloc(sizeof(struct usbhid_device), GFP_KERNEL);
- if (usbhid == NULL) {
- ret = -ENOMEM;
- goto err;
- }
-
- hid->driver_data = usbhid;
- usbhid->hid = hid;
-
usbhid->bufsize = HID_MIN_BUFFER_SIZE;
hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
@@ -804,6 +794,7 @@ static int usbhid_start(struct hid_device *hid)
if (insize > HID_MAX_BUFFER_SIZE)
insize = HID_MAX_BUFFER_SIZE;
+ mutex_lock(&usbhid->setup);
if (hid_alloc_buffers(dev, hid)) {
ret = -ENOMEM;
goto fail;
@@ -888,6 +879,9 @@ static int usbhid_start(struct hid_device *hid)
usbhid_init_reports(hid);
hid_dump_device(hid);
+ set_bit(HID_STARTED, &usbhid->iofl);
+ mutex_unlock(&usbhid->setup);
+
return 0;
fail:
@@ -895,8 +889,7 @@ fail:
usb_free_urb(usbhid->urbout);
usb_free_urb(usbhid->urbctrl);
hid_free_buffers(dev, hid);
- kfree(usbhid);
-err:
+ mutex_unlock(&usbhid->setup);
return ret;
}
@@ -907,6 +900,8 @@ static void usbhid_stop(struct hid_device *hid)
if (WARN_ON(!usbhid))
return;
+ mutex_lock(&usbhid->setup);
+ clear_bit(HID_STARTED, &usbhid->iofl);
spin_lock_irq(&usbhid->inlock); /* Sync with error handler */
set_bit(HID_DISCONNECTED, &usbhid->iofl);
spin_unlock_irq(&usbhid->inlock);
@@ -931,8 +926,7 @@ static void usbhid_stop(struct hid_device *hid)
usb_free_urb(usbhid->urbout);
hid_free_buffers(hid_to_usb_dev(hid), hid);
- kfree(usbhid);
- hid->driver_data = NULL;
+ mutex_unlock(&usbhid->setup);
}
static struct hid_ll_driver usb_hid_driver = {
@@ -947,6 +941,7 @@ static struct hid_ll_driver usb_hid_driver = {
static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev(intf);
+ struct usbhid_device *usbhid;
struct hid_device *hid;
size_t len;
int ret;
@@ -1000,14 +995,26 @@ static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
hid->uniq[0] = 0;
+ usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
+ if (usbhid == NULL) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ hid->driver_data = usbhid;
+ usbhid->hid = hid;
+ mutex_init(&usbhid->setup); /* needed on suspend/resume */
+
ret = hid_add_device(hid);
if (ret) {
if (ret != -ENODEV)
dev_err(&intf->dev, "can't add hid device: %d\n", ret);
- goto err;
+ goto err_free;
}
return 0;
+err_free:
+ kfree(usbhid);
err:
hid_destroy_device(hid);
return ret;
@@ -1016,11 +1023,14 @@ err:
static void hid_disconnect(struct usb_interface *intf)
{
struct hid_device *hid = usb_get_intfdata(intf);
+ struct usbhid_device *usbhid;
if (WARN_ON(!hid))
return;
+ usbhid = hid->driver_data;
hid_destroy_device(hid);
+ kfree(usbhid);
}
static int hid_suspend(struct usb_interface *intf, pm_message_t message)
@@ -1028,11 +1038,18 @@ static int hid_suspend(struct usb_interface *intf, pm_message_t message)
struct hid_device *hid = usb_get_intfdata (intf);
struct usbhid_device *usbhid = hid->driver_data;
+ mutex_lock(&usbhid->setup);
+ if (!test_bit(HID_STARTED, &usbhid->iofl)) {
+ mutex_unlock(&usbhid->setup);
+ return 0;
+ }
+
spin_lock_irq(&usbhid->inlock); /* Sync with error handler */
set_bit(HID_SUSPENDED, &usbhid->iofl);
spin_unlock_irq(&usbhid->inlock);
del_timer(&usbhid->io_retry);
usb_kill_urb(usbhid->urbin);
+ mutex_unlock(&usbhid->setup);
dev_dbg(&intf->dev, "suspend\n");
return 0;
}
@@ -1043,9 +1060,16 @@ static int hid_resume(struct usb_interface *intf)
struct usbhid_device *usbhid = hid->driver_data;
int status;
+ mutex_lock(&usbhid->setup);
+ if (!test_bit(HID_STARTED, &usbhid->iofl)) {
+ mutex_unlock(&usbhid->setup);
+ return 0;
+ }
+
clear_bit(HID_SUSPENDED, &usbhid->iofl);
usbhid->retry_delay = 0;
status = hid_start_in(hid);
+ mutex_unlock(&usbhid->setup);
dev_dbg(&intf->dev, "resume status %d\n", status);
return status;
}
diff --git a/drivers/hid/usbhid/usbhid.h b/drivers/hid/usbhid/usbhid.h
index abedb13c623..55973ff5400 100644
--- a/drivers/hid/usbhid/usbhid.h
+++ b/drivers/hid/usbhid/usbhid.h
@@ -27,6 +27,7 @@
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/list.h>
+#include <linux/mutex.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
@@ -73,6 +74,7 @@ struct usbhid_device {
dma_addr_t outbuf_dma; /* Output buffer dma */
spinlock_t outlock; /* Output fifo spinlock */
+ struct mutex setup;
unsigned long iofl; /* I/O flags (CTRL_RUNNING, OUT_RUNNING) */
struct timer_list io_retry; /* Retry timer */
unsigned long stop_retry; /* Time to give up, in jiffies */
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 5355ca4b939..e5780f8c934 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -410,6 +410,7 @@ struct hid_output_fifo {
#define HID_SUSPENDED 5
#define HID_CLEAR_HALT 6
#define HID_DISCONNECTED 7
+#define HID_STARTED 8
struct hid_input {
struct list_head list;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 21:24:37 +0000