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| author |   David Herrmann <dh.herrmann@gmail.com> | 2013-05-05 23:13:03 +0200 |
|---|---|---|
| committer |   Jiri Kosina <jkosina@suse.cz> | 2013-06-03 11:07:04 +0200 |
| commit | d76f89e13a0439649120a85297085e8d8fff77ec (patch) | |
| tree | 2b4d434b7085dfba62a2dfb19cb50dc3d5f092e7 /drivers/hid | |
| parent | HID: wiimote: fix ctx pointer in debugfs DRM-write (diff) | |
| download | linux-dev-d76f89e13a0439649120a85297085e8d8fff77ec.tar.xz linux-dev-d76f89e13a0439649120a85297085e8d8fff77ec.zip | |
HID: wiimote: lock DRM mode during debugfs overwrite
If we write a DRM mode via debugfs, we shouldn't allow normal operations
to overwrite this DRM mode. This is important if we want to debug
3rd-party devices and we want to see what data is sent on each mode.
If we write NULL/0 as DRM, the lock is removed again so the best matching
DRM is chosen by wiimote core.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-wiimote-core.c | 4 | ||||
| -rw-r--r-- | drivers/hid/hid-wiimote-debug.c | 3 | ||||
| -rw-r--r-- | drivers/hid/hid-wiimote.h | 1 |
3 files changed, 7 insertions, 1 deletions
diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c index f6c4773fac56..13963b4c8801 100644 --- a/drivers/hid/hid-wiimote-core.c +++ b/drivers/hid/hid-wiimote-core.c @@ -242,7 +242,9 @@ void wiiproto_req_drm(struct wiimote_data *wdata, __u8 drm) { __u8 cmd[3]; - if (drm == WIIPROTO_REQ_NULL) + if (wdata->state.flags & WIIPROTO_FLAG_DRM_LOCKED) + drm = wdata->state.drm; + else if (drm == WIIPROTO_REQ_NULL) drm = select_drm(wdata); cmd[0] = WIIPROTO_REQ_DRM; diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c index 0c0deaa23774..6e76a2c3b00a 100644 --- a/drivers/hid/hid-wiimote-debug.c +++ b/drivers/hid/hid-wiimote-debug.c @@ -154,7 +154,10 @@ static ssize_t wiidebug_drm_write(struct file *f, const char __user *u, i = simple_strtoul(buf, NULL, 10); spin_lock_irqsave(&dbg->wdata->state.lock, flags); + dbg->wdata->state.flags &= ~WIIPROTO_FLAG_DRM_LOCKED; wiiproto_req_drm(dbg->wdata, (__u8) i); + if (i != WIIPROTO_REQ_NULL) + dbg->wdata->state.flags |= WIIPROTO_FLAG_DRM_LOCKED; spin_unlock_irqrestore(&dbg->wdata->state.lock, flags); return len; diff --git a/drivers/hid/hid-wiimote.h b/drivers/hid/hid-wiimote.h index 3a8bdb94152a..9f857c1cd84a 100644 --- a/drivers/hid/hid-wiimote.h +++ b/drivers/hid/hid-wiimote.h @@ -43,6 +43,7 @@ #define WIIPROTO_FLAG_MP_USED 0x1000 #define WIIPROTO_FLAG_MP_ACTIVE 0x2000 #define WIIPROTO_FLAG_EXITING 0x4000 +#define WIIPROTO_FLAG_DRM_LOCKED 0x8000 #define WIIPROTO_FLAGS_LEDS (WIIPROTO_FLAG_LED1 | WIIPROTO_FLAG_LED2 | \ WIIPROTO_FLAG_LED3 | WIIPROTO_FLAG_LED4) |