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https://github.com/archlinuxarm/PKGBUILDs.git
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86 lines
3.1 KiB
Diff
86 lines
3.1 KiB
Diff
From b947f36e0453d0bc466fd88a883f3c4a50e6f6a1 Mon Sep 17 00:00:00 2001
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From: Tony Lindgren <tony@atomide.com>
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Date: Fri, 30 Sep 2016 11:10:09 -0700
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Subject: [PATCH 11/14] usb: musb: Fix hardirq-safe hardirq-unsafe lock order
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error
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If we configure musb with 2430 glue as a peripheral, and then rmmod
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omap2430 module, we'll get the following error:
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[ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]
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...
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rmmod/413 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
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(&phy->mutex){+.+.+.}, at: [<c04b9fd0>] phy_power_off+0x1c/0xb8
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[ 204.678710]
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and this task is already holding:
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(&(&musb->lock)->rlock){-.-...}, at: [<bf3a482c>]
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musb_gadget_stop+0x24/0xec [musb_hdrc]
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which would create a new lock dependency:
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(&(&musb->lock)->rlock){-.-...} -> (&phy->mutex){+.+.+.}
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...
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This is because some glue layers expect musb_platform_enable/disable
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to be called with spinlock held, and 2430 glue layer has USB PHY on
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the I2C bus using a mutex.
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We could fix the glue layers to take the spinlock, but we still have
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a problem of musb_plaform_enable/disable being called in an unbalanced
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manner. So that would still lead into USB PHY enable/disable related
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problems for omap2430 glue layer.
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While it makes sense to only enable USB PHY when needed from PM point
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of view, in this case we just can't do it yet without breaking things.
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So let's just revert phy_enable/disable related changes instead and
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reconsider this after we have fixed musb_platform_enable/disable to
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be balanced.
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Fixes: a83e17d0f73b ("usb: musb: Improve PM runtime and phy handling
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for 2430 glue layer")
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Signed-off-by: Tony Lindgren <tony@atomide.com>
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Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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---
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drivers/usb/musb/omap2430.c | 7 ++-----
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1 file changed, 2 insertions(+), 5 deletions(-)
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diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
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index 0b4cec9..dae92de 100644
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--- a/drivers/usb/musb/omap2430.c
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+++ b/drivers/usb/musb/omap2430.c
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@@ -337,6 +337,7 @@ static int omap2430_musb_init(struct musb *musb)
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}
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musb->isr = omap2430_musb_interrupt;
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phy_init(musb->phy);
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+ phy_power_on(musb->phy);
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l = musb_readl(musb->mregs, OTG_INTERFSEL);
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@@ -373,8 +374,6 @@ static void omap2430_musb_enable(struct musb *musb)
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struct musb_hdrc_platform_data *pdata = dev_get_platdata(dev);
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struct omap_musb_board_data *data = pdata->board_data;
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- if (!WARN_ON(!musb->phy))
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- phy_power_on(musb->phy);
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omap2430_set_power(musb, true, glue->cable_connected);
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@@ -413,9 +412,6 @@ static void omap2430_musb_disable(struct musb *musb)
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struct device *dev = musb->controller;
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struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
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- if (!WARN_ON(!musb->phy))
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- phy_power_off(musb->phy);
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-
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if (glue->status != MUSB_UNKNOWN)
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omap_control_usb_set_mode(glue->control_otghs,
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USB_MODE_DISCONNECT);
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@@ -429,6 +425,7 @@ static int omap2430_musb_exit(struct musb *musb)
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struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
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omap2430_low_level_exit(musb);
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+ phy_power_off(musb->phy);
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phy_exit(musb->phy);
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musb->phy = NULL;
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cancel_work_sync(&glue->omap_musb_mailbox_work);
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--
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2.10.0
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