Hi,
I'm using SLES11-SP1 kernel 2.6.32 .12-0.7
I wrote a block driver for an in-memory disk. The driver seems to work fine
however sometimes when I try to unload the driver the machine freezes, the
module_exit code looks like the following,
/*We take no more requests!*/
spin_lock_irqsave(&pks_disk->queue_lock,flags);
blk_stop_queue(pks_disk->pks_disk_rqq);
spin_unlock_irqrestore(&pks_disk->queue_lock,flags);
/*Remove disk*/
del_gendisk(pks_disk->pks_disk_gd);
/*free queue*/
blk_cleanup_queue(pks_disk->pks_disk_rqq);
I searched around and found out that while processing the requests from request
queue you've got to use one of the blk_end_request* functions (which I did).
However if I only use
a) blk_end_request: The module removal code freezes machine.
b) blk_end_request_cur: The module removal code works fine.
There's one more
c)blk_end_request_all: Didn't used this one cuz the above one worked :P.
I digged around in the source and found this function
blk_update_request
and in the comment section it says " Actual device drivers should use
blk_end_request instead" which I did and the driver module didn't liked it when
I tried to remove it :(
Now I'm confused as I've got no clue when to use which function can anyone give
some examples please?
--P.K.S
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