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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Tony Lindgren <tony@atomide.com>, Pavel Machek <pavel@ucw.cz>,
	Bin Liu <b-liu@ti.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sasha Levin <sashal@kernel.org>,
	linux-usb@vger.kernel.org, linux-omap@vger.kernel.org
Subject: [PATCH AUTOSEL 5.5 364/542] usb: musb: omap2430: Get rid of musb .set_vbus for omap2430 glue
Date: Fri, 14 Feb 2020 10:45:56 -0500
Message-ID: <20200214154854.6746-364-sashal@kernel.org> (raw)
In-Reply-To: <20200214154854.6746-1-sashal@kernel.org>

From: Tony Lindgren <tony@atomide.com>

[ Upstream commit 91b6dec32e5c25fbdbb564d1e5af23764ec17ef1 ]

We currently have musb_set_vbus() called from two different paths. Mostly
it gets called from the USB PHY via omap_musb_set_mailbox(), but in some
cases it can get also called from musb_stage0_irq() rather via .set_vbus:

(musb_set_host [musb_hdrc])
(omap2430_musb_set_vbus [omap2430])
(musb_stage0_irq [musb_hdrc])
(musb_interrupt [musb_hdrc])
(omap2430_musb_interrupt [omap2430])

This is racy and will not work with introducing generic helper functions
for musb_set_host() and musb_set_peripheral(). We want to get rid of the
busy loops in favor of usleep_range().

Let's just get rid of .set_vbus for omap2430 glue layer and let the PHY
code handle VBUS with musb_set_vbus(). Note that in the follow-up patch
we can completely remove omap2430_musb_set_vbus(), but let's do it in a
separate patch as this change may actually turn out to be needed as a
fix.

Reported-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200115132547.364-5-b-liu@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/musb/omap2430.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index a3d2fef677468..5c93226e0e20a 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -361,8 +361,6 @@ static const struct musb_platform_ops omap2430_ops = {
 	.init		= omap2430_musb_init,
 	.exit		= omap2430_musb_exit,
 
-	.set_vbus	= omap2430_musb_set_vbus,
-
 	.enable		= omap2430_musb_enable,
 	.disable	= omap2430_musb_disable,
 
-- 
2.20.1


      parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214154854.6746-1-sashal@kernel.org>
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 075/542] usb: gadget: udc: fix possible sleep-in-atomic-context bugs in gr_probe() Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 076/542] usb: dwc2: Fix IN FIFO allocation Sasha Levin
2020-02-14 15:44 ` [PATCH AUTOSEL 5.5 305/542] usb: dwc3: use proper initializers for property entries Sasha Levin
2020-02-14 15:44 ` [PATCH AUTOSEL 5.5 307/542] usbip: Fix unsafe unaligned pointer usage Sasha Levin
2020-02-14 15:45 ` Sasha Levin [this message]

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