Steve 

Sorry to take so long getting back to you.

When I wrote this code I thought the callback would get called regardless of 
whether or not the actioned passed or failed.

Reading through the nand.c in mtd it appears that the callback only gets 
called if the erase passes.

We have three options here:

* Forget using the callback (ie. in yaffs_mtdif.c, do not set up a callback). 
Just use the result from the call. This will work if the call only returns 
after the erase is complete (with or without failure).
* Change yaffs_mtdif.c to up the lock on error.
* Change nand.c to call the callback regardless of the result.

The callback releases a lock, but it appears that the chip is locked anyway 
so this extra locking is perhaps unwarranted.

Thomas: I defer to your judgement. In the meantime, Steve, I suggest 
disabling the callback. ie: in nandmtd_EraseBlockInNAND:
 - set ei.callback to NULL instead of the callback address
 - comment out the down(&dev.sem)


-- Charles


On Thu, 03 Apr 2003 17:51, Steve Tsai wrote:
> My system halt when I did some file operation on yaffs file system. And
> the console display "nand_erase: attempt to erase a bad block at page
> 0x00001ce0" then the system halt. I found that nandmtd_EraseBlockInNAND
> will not return, if nand_erase does not call the callback function.
> nand_erase will not call to callback function, if it does not erase
> flash successfully.  Does anyone fix it?
>
> Steve Tsai
>
>
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