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Date: Fri, 17 Oct 2014 23:52:34 -0400 (EDT) From: David Miller <davem@...emloft.net> To: linux@...ck-us.net Cc: f.fainelli@...il.com, alexander.h.duyck@...el.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] dsa: Fix conversion from host device to mii bus From: Guenter Roeck <linux@...ck-us.net> Date: Fri, 17 Oct 2014 12:30:58 -0700 > Commit b4d2394d01bc ("dsa: Replace mii_bus with a generic host device") > replaces mii_bus with a generic host_dev, and introduces > dsa_host_dev_to_mii_bus() to support conversion from host_dev to mii_bus. > However, in some cases it uses to_mii_bus to perform that conversion. > Since host_dev is not the phy bus device but typically a platform device, > this fails and results in a crash with the affected drivers. > > BUG: unable to handle kernel NULL pointer dereference at (null) > IP: [<ffffffff81781d35>] __mutex_lock_slowpath+0x75/0x100 > PGD 406783067 PUD 406784067 PMD 0 > Oops: 0002 [#1] SMP > ... > Call Trace: > [<ffffffff810a538b>] ? pick_next_task_fair+0x61b/0x880 > [<ffffffff81781de3>] mutex_lock+0x23/0x37 > [<ffffffff81533244>] mdiobus_read+0x34/0x60 > [<ffffffff8153b95a>] __mv88e6xxx_reg_read+0x8a/0xa0 > [<ffffffff8153b9bc>] mv88e6xxx_reg_read+0x4c/0xa0 > > Fixes: b4d2394d01bc ("dsa: Replace mii_bus with a generic host device") > Cc: Alexander Duyck <alexander.h.duyck@...el.com> > Signed-off-by: Guenter Roeck <linux@...ck-us.net> Applied, thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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