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Subjectscsi proc_info called unconditionally

Why is ->proc_info() called when the function pointer is NULL?

(none):/# mount proc
(none):/# cat /proc/scsi/
53c94 device_info scsi
(none):/# cat /proc/scsi/53c94/0
proc_scsi_read: 00000000 called
Oops: kernel access of bad area, sig: 11 [#1]
NIP: 00000000 LR: C00EC6C8 SP: C03BBE90 REGS: c03bbde0 TRAP: 0401 Not tainted
MSR: 40009030 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
TASK = c027b7e0[16] 'cat' Last syscall: 3
GPR00: C00EC6A0 C03BBE90 C027B7E0 C4705400 C43B5000 C03BBEC8 00000000 00000C00
GPR08: 00000000 00000000 C01C6E8F C01B0000 0000000D
Call trace:
[c007a254] proc_file_read+0xb8/0x2cc
[c004d97c] vfs_read+0xdc/0x128
[c004dbe8] sys_read+0x40/0x74
[c000780c] ret_from_syscall+0x0/0x4c
Segmentation fault


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