diff options
| author | Felipe Contreras <felipe.contreras@gmail.com> | 2011-12-19 22:01:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2012-01-12 11:29:41 -0800 |
| commit | 945d49b38f4e3aa8a570b2fe51f179e7c2181b4d (patch) | |
| tree | 029bd9d12889cc661f2aef48f0a1354b3b708662 | |
| parent | dd857f5b4dc1d8d010da1711b71be789054fbcbe (diff) | |
usb: musb: fix pm_runtime mismatch
commit 772aed45b604c5ff171f0f12c12392d868333f79 upstream.
In musb_init_controller() there's a pm_runtime_put(), but there's no
pm_runtime_get(), which creates a mismatch that causes the driver to
sleep when it shouldn't.
This was introduced in 7acc619[1], but it wasn't triggered in my setup
until 18a2689[2] was merged to Linus' branch at point df0914[3]. IOW;
when PM is working as it was supposed to.
However, it seems most of the time this is used in a way that keeps the
counter above 0, so nobody noticed. Also, it seems to depend on the
configuration used in versions before 3.1, but not later (or in it).
I found the problem by loading isp1704_charger before any usb gadgets:
http://article.gmane.org/gmane.linux.kernel/1226122
All versions after 2.6.39 are affected.
[1] usb: musb: Idle path retention and offmode support for OMAP3
[2] OMAP2+: musb: hwmod adaptation for musb registration
[3] Merge branch 'omap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6
Cc: Hema HK <hemahk@ti.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
| -rw-r--r-- | drivers/usb/musb/musb_core.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index b63ab157010..920f04e5f3a 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -2012,8 +2012,6 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl) if (status < 0) goto fail3; - pm_runtime_put(musb->controller); - status = musb_init_debugfs(musb); if (status < 0) goto fail4; |