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| author | Richard Purdie <rpurdie@rpsys.net> | 2007-02-08 22:25:09 +0000 |
|---|---|---|
| committer | Richard Purdie <rpurdie@rpsys.net> | 2007-02-20 08:38:45 +0000 |
| commit | 28ee086d5b36aab2931f6740e409bb0fb6c65e5f (patch) | |
| tree | 0a308c80affcc39c2c869f29f1109e5ee9d6140f /drivers/usb | |
| parent | a8db3c1948eb30cd6988b5b96b654f591e6280b1 (diff) | |
| download | linux-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.tar.gz linux-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.tar.bz2 linux-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.zip | |
backlight: Fix external uses of backlight internal semaphore
backlight_device->sem has a very specific use as documented in the
header file. The external users of this are using it for a different
reason, to serialise access to the update_status() method.
backlight users were supposed to implement their own internal
serialisation of update_status() if needed but everyone is doing
things differently and incorrectly. Therefore add a global mutex to
take care of serialisation for everyone, once and for all.
Locking for get_brightness remains optional since most users don't
need it.
Also update the lcd class in a similar way.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/misc/appledisplay.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c index 416cde5893af..cd2c5574cf93 100644 --- a/drivers/usb/misc/appledisplay.c +++ b/drivers/usb/misc/appledisplay.c @@ -189,11 +189,9 @@ static void appledisplay_work(struct work_struct *work) container_of(work, struct appledisplay, work.work); int retval; - up(&pdata->bd->sem); retval = appledisplay_bl_get_brightness(pdata->bd); if (retval >= 0) pdata->bd->props->brightness = retval; - down(&pdata->bd->sem); /* Poll again in about 125ms if there's still a button pressed */ if (pdata->button_pressed) @@ -288,9 +286,7 @@ static int appledisplay_probe(struct usb_interface *iface, } /* Try to get brightness */ - up(&pdata->bd->sem); brightness = appledisplay_bl_get_brightness(pdata->bd); - down(&pdata->bd->sem); if (brightness < 0) { retval = brightness; @@ -299,9 +295,7 @@ static int appledisplay_probe(struct usb_interface *iface, } /* Set brightness in backlight device */ - up(&pdata->bd->sem); pdata->bd->props->brightness = brightness; - down(&pdata->bd->sem); /* save our data pointer in the interface device */ usb_set_intfdata(iface, pdata); |