Comment 7 for bug 1037565

Observed with android vexpress JB build
https://android-build.linaro.org/builds/~linaro-android/vexpress-jb-gcc47-armlt-tracking-open/#build=37

LOGS:

[ 263.224205] CPU0
[ 263.231518] ----
[ 263.238827] lock(&(&client->buffer_lock)->rlock);
[ 263.253461] <Interrupt>
[ 263.261294] lock(&(&client->buffer_lock)->rlock);
[ 263.276449]
[ 263.276449] *** DEADLOCK ***
[ 263.276449]
[ 263.294192] 2 locks held by InputReader/2014:
[ 263.307237] #0: (&evdev->mutex){+.+...}, at: [<c03aadc4>] evdev_ioctl+0x2c/0x91c
[ 263.330005] #1: (&(&client->buffer_lock)->rlock){?.....}, at: [<c03aafe4>] evdev_ioctl+0x24c/0x91c
[ 263.357450]
[ 263.357450] stack backtrace:
[ 263.370533] [<c0015058>] (unwind_backtrace+0x0/0xf8) from [<c04fce78>] (print_usage_bug+0x248/0x2b0)
[ 263.397929] [<c04fce78>] (print_usage_bug+0x248/0x2b0) from [<c0071c70>] (mark_lock+0x2a0/0x67c)
[ 263.424276] [<c0071c70>] (mark_lock+0x2a0/0x67c) from [<c007468c>] (mark_held_locks+0x5c/0x124)
[ 263.450361] [<c007468c>] (mark_held_locks+0x5c/0x124) from [<c00747fc>] (trace_hardirqs_on_caller+0xa8/0x190)
[ 263.480096] [<c00747fc>] (trace_hardirqs_on_caller+0xa8/0x190) from [<c05052e4>] (_raw_spin_unlock_irq+0x24/0x2c)
[ 263.510875] [<c05052e4>] (_raw_spin_unlock_irq+0x24/0x2c) from [<c03aaff8>] (evdev_ioctl+0x260/0x91c)
[ 263.538529] [<c03aaff8>] (evdev_ioctl+0x260/0x91c) from [<c00f4678>] (do_vfs_ioctl+0x80/0x538)
[ 263.564352] [<c00f4678>] (do_vfs_ioctl+0x80/0x538) from [<c00f4b64>] (sys_ioctl+0x34/0x60)
[ 263.589133] [<c00f4b64>] (sys_ioctl+0x34/0x60) from [<c000e000>] (ret_fast_syscall+0x0/0x3c)
[ 362.131513] init: sys_prop: permission denied uid:1003 name:service.bootanim.exit
[ 476.986679] mmcblk0: error -5 transferring data, sector 617064, nr 24, cmd response 0x900, card status 0xb00
[ 477.016346] mmcblk0: retrying using single block transfer
[ 484.922577] mmcblk0: error -5 transferring data, sector 1979938, nr 30, cmd response 0x900, card status 0xc00
[ 484.952583] mmcblk0: retrying using single block transfer
[ 486.646280] mmcblk0: error -5 transferring data, sector 624360, nr 8, cmd response 0x900, card status 0xb00
[ 486.675675] mmcblk0: retrying using single block transfer