From: Grazvydas Ignotas <notasas@gmail.com>
Date: Wed, 23 May 2012 23:16:11 +0000 (+0300)
Subject: usb: musb_gadget: fix crash caused by dangling pointer
X-Git-Tag: sz_beta5a^0
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c6ee636de01b3569731c1704cea14de98fdba2c;p=pandora-kernel.git

usb: musb_gadget: fix crash caused by dangling pointer

usb_ep_ops.disable must clear external copy of the endpoint descriptor,
otherwise musb crashes after loading/unloading several gadget modules
in a row:

Unable to handle kernel paging request at virtual address bf013730
pgd = c0004000
[bf013730] *pgd=8f26d811, *pte=00000000, *ppte=00000000
Internal error: Oops: 7 [#1]
Modules linked in: g_cdc [last unloaded: g_file_storage]
CPU: 0    Not tainted  (3.2.17 #647)
PC is at musb_gadget_enable+0x4c/0x24c
LR is at _raw_spin_lock_irqsave+0x4c/0x58
[<c027c030>] (musb_gadget_enable+0x4c/0x24c) from [<bf01b760>] (gether_connect+0x3c/0x19c [g_cdc])
[<bf01b760>] (gether_connect+0x3c/0x19c [g_cdc]) from [<bf01ba1c>] (ecm_set_alt+0x15c/0x180 [g_cdc])
[<bf01ba1c>] (ecm_set_alt+0x15c/0x180 [g_cdc]) from [<bf01ecd4>] (composite_setup+0x85c/0xac4 [g_cdc])
[<bf01ecd4>] (composite_setup+0x85c/0xac4 [g_cdc]) from [<c027b744>] (musb_g_ep0_irq+0x844/0x924)
[<c027b744>] (musb_g_ep0_irq+0x844/0x924) from [<c027a97c>] (musb_interrupt+0x79c/0x864)
[<c027a97c>] (musb_interrupt+0x79c/0x864) from [<c027aaa8>] (generic_interrupt+0x64/0x7c)
[<c027aaa8>] (generic_interrupt+0x64/0x7c) from [<c00797cc>] (handle_irq_event_percpu+0x28/0x178)
...

Cc: stable@vger.kernel.org # v3.1+
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
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