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| author | Yauheni Kaliuta <yauheni.kaliuta@nokia.com> | 2011-10-13 13:19:05 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-10-18 22:49:17 +0200 |
| commit | 91960c2ef095c4b0744349e80a933921cbdcfd6e (patch) | |
| tree | 578cfcdd1d4de5d0e1d870a71bb6f6d264c39015 /drivers/usb/wusbcore | |
| parent | USB: ftdi_sio.c: Use ftdi async_icount structure for TIOCMIWAIT, as in other ... (diff) | |
| download | linux-91960c2ef095c4b0744349e80a933921cbdcfd6e.tar.xz linux-91960c2ef095c4b0744349e80a933921cbdcfd6e.zip | |
usb: gadget: file_storage: fix race on unloading
There is a race, reproduced rarely if you unload the module
when host finishes mass storage device initialization (reading
partition table and so on): fsg_unbind() code first closes
lun files then waits for worker thread to finish its work, as
the result the thread may operate on already closed device
with an oops and backtrace:
[ 484.937225] [<b00e403c>] (touch_atime+0x4/0x140) from [<b00a1498>] (generic_file_aio_read+0x678/0x6f0)
[ 484.946563] [<b00a1498>] (generic_file_aio_read+0x678/0x6f0) from [<b00d08c4>] (do_sync_read+0xb0/0xf4)
[ 484.955963] [<b00d08c4>] (do_sync_read+0xb0/0xf4) from [<b00d1478>] (vfs_read+0xac/0x144)
[ 484.964172] [<b00d1478>] (vfs_read+0xac/0x144) from [<af24c6a8>] (fsg_setup+0x7f4/0x900 [g_file_storage])
[ 484.973785] [<af24c6a8>] (fsg_setup+0x7f4/0x900 [g_file_storage]) from [<af24da14>] (fsg_main_thread+0x85c/0x175c [g_file_storage])
[ 484.985626] [<af24da14>] (fsg_main_thread+0x85c/0x175c [g_file_storage]) from [<b0077c48>] (kthread+0x7c/0x84)
[ 484.995666] [<b0077c48>] (kthread+0x7c/0x84) from [<b002f950>] (kernel_thread_exit+0x0/0x8)
[ 485.004028] Code: eaffffd0 e28dd008 e8bd8df0 e92d40f7 (e591400c)
Change the order in unbind: wait for the thread first, then close
the files.
Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@nokia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/wusbcore')
0 files changed, 0 insertions, 0 deletions