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authorDavid Herrmann <dh.herrmann@gmail.com>2013-05-05 23:13:03 +0200
committerJiri Kosina <jkosina@suse.cz>2013-06-03 11:07:04 +0200
commitd76f89e13a0439649120a85297085e8d8fff77ec (patch)
tree2b4d434b7085dfba62a2dfb19cb50dc3d5f092e7 /drivers/hid/hid-wiimote-debug.c
parent51103c70bf8d48395ff77eee387e6c94f0216630 (diff)
downloadlinux-d76f89e13a0439649120a85297085e8d8fff77ec.tar.bz2
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/hid-wiimote-debug.c')
-rw-r--r--drivers/hid/hid-wiimote-debug.c3
1 files changed, 3 insertions, 0 deletions
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;