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| author | Guenter Roeck <linux@roeck-us.net> | 2014-10-17 12:30:58 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-17 23:52:08 -0400 |
| commit | b184e497f7fe2895b2175859e0cb21ae5d531555 (patch) | |
| tree | ea1d277d73e4388820caf1fab98f8d6f53f993dc /net/netrom/nr_subr.c | |
| parent | 643566d4b47e2956110e79c0e6f65db9b9ea42c6 (diff) | |
| download | blackbird-op-linux-b184e497f7fe2895b2175859e0cb21ae5d531555.tar.gz blackbird-op-linux-b184e497f7fe2895b2175859e0cb21ae5d531555.zip | |
dsa: Fix conversion from host device to mii bus
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@intel.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netrom/nr_subr.c')
0 files changed, 0 insertions, 0 deletions
