linux-kernel - Re: [PATCH 1/3] usb: gadget: function: phonet: balance usb_ep

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Message-ID: <20150220143906.GA1707@saruman.tx.rr.com>
Date:	Fri, 20 Feb 2015 08:39:06 -0600
From:	Felipe Balbi <balbi@...com>
To:	Pavel Machek <pavel@....cz>
CC:	Felipe Balbi <balbi@...com>,
	Pali Rohár <pali.rohar@...il.com>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Sebastian Reichel <sre@...nel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] usb: gadget: function: phonet: balance
 usb_ep_disable calls

On Fri, Feb 20, 2015 at 09:27:51AM +0100, Pavel Machek wrote:
> > > > > > > In current state I review all 3 patches as:
> > > > > > > 
> > > > > > > Rejected-by: Pali Rohár <pali.rohar@...il.com>
> > > > > > > [It breaks booting Nokia N900 device]
> > > > > > 
> > > > > > next step, figure why it's broken. Working just fine here
> > > > > > on AM335x which has the same musb IP.
> > > > > 
> > > > > Why is broken? That is easy. You send 3 patches which broke
> > > > > it.
> > > > 
> > > > Actually when I reverted only that patch which adds line:
> > > > 
> > > > pm_runtime_irq_safe(musb->controller)
> > > > 
> > > > then early boot crash disappeared.
> > > > 
> > > > But other two patches did not fixed support for external .ko
> > > > gadget modules. State is same -- crash after modprobe.
> > > 
> > > Here is crash from qemu when musb is compiled into kernel:
> > > 
> > > [    0.641662] Unable to handle kernel NULL pointer dereference at virtual address 00000000
> > > [    0.642211] pgd = c0004000
> ...
> > > [    0.672882] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
> > > [    0.672882]
> > > 
> > > Reason why it crashes is because when function
> > > omap2430_runtime_resume() is called pointer to functions 
> > > musb_readl and musb_writel are both NULL. And so NULL pointer
> > > dereference.
> > 
> > https://git.kernel.org/cgit/linux/kernel/git/balbi/usb.git/commit/?h=testing/next&id=1861a2c60351a390272b3395f4d88480cdfd9e58
> >
> 
> So you commit a fix to your internal branch without telling Pali, who
> is actively debugging same problem at the same time, and then you just
> send him url without at least saying "sorry"?

grow up... why do I have to say sorry for fixing a problem ? Why do I
have to let you know I committed something to my branch ? It's the
middle of the merge window, nothing will happen until -rc1 is out, at
which point I'll send this to the mailing list before sending a pull
request to Greg.

-- 
balbi

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