From 945d49b38f4e3aa8a570b2fe51f179e7c2181b4d Mon Sep 17 00:00:00 2001 From: Felipe Contreras Date: Mon, 19 Dec 2011 22:01:54 +0200 Subject: [PATCH] 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 Signed-off-by: Felipe Contreras Signed-off-by: Felipe Balbi --- drivers/usb/musb/musb_core.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index b63ab1570103..920f04e5f3a8 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; -- 2.39.5