linux-kernel - [RFC PATCH] usb: musb: Fix external abort in musb

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Message-Id: <20180308093121.11943-1-merlijn@wizzup.org>
Date:   Thu,  8 Mar 2018 10:31:21 +0100
From:   Merlijn Wajer <merlijn@...zup.org>
To:     b-liu@...com
Cc:     merlijn@...zup.org, ivo.g.dimitrov.75@...il.com,
        linux-omap@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH] usb: musb: Fix external abort in musb_remove

This fixes an oops on unbind / module unload. The fix is similar to the
one in this commit: 0c3aae9bd59978fb8c3557d7883380bef0f2cfa1 (USB: musb:
fix late external abort on suspend), which only fixes the issue for
musb_suspend.

musb_remove function now also flushes any work and also calls
musb_platform_exit before disabling runtime pm.

Signed-off-by: Merlijn Wajer <merlijn@...zup.org>
---

If I understand commit 0c3aae9bd59978fb8c3557d7883380bef0f2cfa1 correctly,
this patch should also be backported to 4.9 (and newer kernels).

I have verified that this works on the Nokia N900, RX-51. The problem did not
occur on the Motorola Droid 4, but I have yet to test if this patch causes
issues there.

 drivers/usb/musb/musb_core.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index e2e95071328a..4fb0f345c04e 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2472,13 +2472,19 @@ static int musb_remove(struct platform_device *pdev)
 	musb_platform_disable(musb);
 	spin_lock_irqsave(&musb->lock, flags);
 	musb_disable_interrupts(musb);
+
+	musb->flush_irq_work = true;
+	while (flush_delayed_work(&musb->irq_work))
+		;
+	musb->flush_irq_work = false;
+
 	musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
+	musb_platform_exit(musb);
 	spin_unlock_irqrestore(&musb->lock, flags);

 	pm_runtime_dont_use_autosuspend(musb->controller);
 	pm_runtime_put_sync(musb->controller);
 	pm_runtime_disable(musb->controller);
-	musb_platform_exit(musb);
 	musb_phy_callback = NULL;
 	if (musb->dma_controller)
 		musb_dma_controller_destroy(musb->dma_controller);
-- 
2.16.2