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authorDavid Herrmann <dh.herrmann@gmail.com>2014-07-29 19:14:20 +0400
committerJiri Kosina <jkosina@suse.cz>2014-08-25 12:28:07 +0400
commit5942b849b124c54002346e699f50db3714e300ed (patch)
treef49c56e28025b2b8b8650f60a414069e85e5fa18 /drivers/hid
parent8cad5b017178bd7fa56d5039478d46964bcd94f7 (diff)
downloadlinux-5942b849b124c54002346e699f50db3714e300ed.tar.xz
HID: uhid: invert report_done and make non-atomic
All accesses to @report_done are protected by qlock (or report-contexts). No need to use an atomic. While at it, invert the logic and call it "report_running". This is similar to the uhid->running field and easier to read. 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/uhid.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index db4e119cb088..2d2025a027fe 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -47,7 +47,7 @@ struct uhid_device {
/* blocking GET_REPORT support; state changes protected by qlock */
struct mutex report_lock;
wait_queue_head_t report_wait;
- atomic_t report_done;
+ bool report_running;
u32 report_id;
struct uhid_event report_buf;
};
@@ -168,13 +168,13 @@ static int uhid_hid_get_raw(struct hid_device *hid, unsigned char rnum,
ev->u.feature.rnum = rnum;
ev->u.feature.rtype = report_type;
- atomic_set(&uhid->report_done, 0);
+ uhid->report_running = true;
uhid_queue(uhid, ev);
spin_unlock_irqrestore(&uhid->qlock, flags);
ret = wait_event_interruptible_timeout(uhid->report_wait,
- atomic_read(&uhid->report_done) || !uhid->running,
- 5 * HZ);
+ !uhid->report_running || !uhid->running,
+ 5 * HZ);
if (!ret || !uhid->running) {
ret = -EIO;
@@ -196,7 +196,7 @@ static int uhid_hid_get_raw(struct hid_device *hid, unsigned char rnum,
spin_unlock_irqrestore(&uhid->qlock, flags);
}
- atomic_set(&uhid->report_done, 1);
+ uhid->report_running = false;
unlock:
mutex_unlock(&uhid->report_lock);
@@ -500,11 +500,11 @@ static int uhid_dev_feature_answer(struct uhid_device *uhid,
/* id for old report; drop it silently */
if (uhid->report_id != ev->u.feature_answer.id)
goto unlock;
- if (atomic_read(&uhid->report_done))
+ if (!uhid->report_running)
goto unlock;
memcpy(&uhid->report_buf, ev, sizeof(*ev));
- atomic_set(&uhid->report_done, 1);
+ uhid->report_running = false;
wake_up_interruptible(&uhid->report_wait);
unlock:
@@ -526,7 +526,6 @@ static int uhid_char_open(struct inode *inode, struct file *file)
init_waitqueue_head(&uhid->waitq);
init_waitqueue_head(&uhid->report_wait);
uhid->running = false;
- atomic_set(&uhid->report_done, 1);
file->private_data = uhid;
nonseekable_open(inode, file);