Flash file system problem

[Cmmn Ml <cm...@ya...>]

Hello

We are working on a SH 7705 processor based board. 
The linux kernel we are using is 2.6.16 with SH linux stable patch (sh--stable--2.6.16). At the moment the linux kernel
is running well with basic features. We're getting following problem with flash file system (JFFS).

We can mount a flash partition using JFFS, and can create directories, files without a problem. But when we try to 
remove a file using rm command we get following error.

---------------------------------------------------------------------

Unable to handle kernel NULL pointer dereference at virtual address 00000070
pc = 8c16fabc
*pde = 00000000
Oops: 0000 [#1]

Pid : 684, Comm:                   rm
PC is at mutex_unlock+0xc/0x40
PC  : 8c16fabc SP  : 8c28df2c SR  : 400001f1 TEA : 00000070    Not tainted
R0  : 00000000 R1  : 40000101 R2  : 40000100 R3  : 00000001
R4  : 00000070 R5  : 002f1493 R6  : ffffffff R7  : 000000f0
R8  : 00000000 R9  : 8c67f224 R10 : 8c5306c4 R11 : 8c530740
R12 : 8c67f224 R13 : 00403d6c R14 : 7bed3eac
MACH: 0000010c MACL: 00000000 GBR : 00000000 PR  : 8c065668

Call trace:
[<8c065736>] do_unlinkat+0x96/0x140
[<8c014090>] ret_from_exception+0x0/0xc
[<8c014184>] syscall_call+0xc/0xe
[<8c065810>] sys_unlink+0x0/0x10

Segmentation fault

---------------------------------------------------------------------

Removing a directory using rmdir or rm -r works fine without giving any error.

We're using Solution Engine as the target board and modified the linux-2.6.16.9/drivers/mtd/maps/solutionengine.c file 
according to our needs. Flash memory type is Spansion (MirrorBit family) S29GLxxxN.

If any one can give us some thoughts on this, it will be a great help.

Thank you in advance

 

Cmmn


       
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