[PATCH update 3/3] fs: Fix crash caused by write to dummy debugfs interface like HW_latency exposed

[ 141.311906] BUG: unable to handle kernel NULL pointer dereference at 0008 [ 141.314071] IP: [] simple_attr_write+0x2c/0x100 [ 141.316195] PGD c3bd7067 PUD cb41d067 PMD 0 [ 141.318287] Oops: [#1] SMP [ 141.320338] Modules linked in: hw_latency_test lockd sunrpc

[PATCH update 3/3] fs: Fix crash caused by write to dummy debugfs interface like HW_latency exposed

[ 141.311906] BUG: unable to handle kernel NULL pointer dereference at 0008 [ 141.314071] IP: [811f8f3c] simple_attr_write+0x2c/0x100 [ 141.316195] PGD c3bd7067 PUD cb41d067 PMD 0 [ 141.318287] Oops: [#1] SMP [ 141.320338] Modules linked in: hw_latency_test lockd