| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Sat, 22 Nov 2008 10:56:39 +0100
From: Jiri Slaby <jirislaby@...il.com>
To: jkosina@...e.cz
Cc: stern@...land.harvard.edu, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...il.com>
Subject: [PATCH 1/1] USBHID: remove setup mutex
It causes recursive locking warning and is unneeded after
introduction of STARTED flag.
* Resume vs. stop is effectively solved by DISCONNECT flag.
* No problem in suspend vs. start -- urb is submitted even after open
which is possible after connect which is called after start.
* Resume vs. start solved by STARTED flag.
* Suspend vs. stop -- no problem in killing urb and timer twice.
Signed-off-by: Jiri Slaby <jirislaby@...il.com>
Reported-by: Alan Stern <stern@...land.harvard.edu>
---
drivers/hid/usbhid/hid-core.c | 18 ++----------------
drivers/hid/usbhid/usbhid.h | 1 -
2 files changed, 2 insertions(+), 17 deletions(-)
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index f86a5c4..f0a0f72 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -796,7 +796,6 @@ 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;
@@ -876,7 +875,6 @@ static int usbhid_start(struct hid_device *hid)
hid_dump_device(hid);
set_bit(HID_STARTED, &usbhid->iofl);
- mutex_unlock(&usbhid->setup);
/* Some keyboards don't work until their LEDs have been set.
* Since BIOSes do set the LEDs, it must be safe for any device
@@ -897,7 +895,6 @@ fail:
usbhid->urbout = NULL;
usbhid->urbctrl = NULL;
hid_free_buffers(dev, hid);
- mutex_unlock(&usbhid->setup);
return ret;
}
@@ -908,7 +905,6 @@ 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);
@@ -937,7 +933,6 @@ static void usbhid_stop(struct hid_device *hid)
usbhid->urbout = NULL;
hid_free_buffers(hid_to_usb_dev(hid), hid);
- mutex_unlock(&usbhid->setup);
}
static struct hid_ll_driver usb_hid_driver = {
@@ -1025,7 +1020,6 @@ static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
hid->driver_data = usbhid;
usbhid->hid = hid;
- mutex_init(&usbhid->setup); /* needed on suspend/resume */
ret = hid_add_device(hid);
if (ret) {
@@ -1060,18 +1054,14 @@ 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);
+ if (!test_bit(HID_STARTED, &usbhid->iofl))
return 0;
- }
spin_lock_irq(&usbhid->inlock); /* Sync with error handler */
set_bit(HID_SUSPENDED, &usbhid->iofl);
spin_unlock_irq(&usbhid->inlock);
del_timer_sync(&usbhid->io_retry);
usb_kill_urb(usbhid->urbin);
- mutex_unlock(&usbhid->setup);
dev_dbg(&intf->dev, "suspend\n");
return 0;
}
@@ -1082,16 +1072,12 @@ 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);
+ if (!test_bit(HID_STARTED, &usbhid->iofl))
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 1ad7782..9eb3056 100644
--- a/drivers/hid/usbhid/usbhid.h
+++ b/drivers/hid/usbhid/usbhid.h
@@ -84,7 +84,6 @@ 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 */
--
1.6.0.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists