Spinlock Related Debug Messages in Block Driver

["Srinivas Ganji" <srinivasganji.linux@gmail.com>]

Dear All,

I implemented the sample block driver for the removable devices and
the code contains no statements related to the spin lock except a lock
to the blk_init_queue API as shown below.

spinlock_t qlock;
gDisk->blkqueue = blk_init_queue(do_my_request, &gDisk->qlock);

The kernel version is 2.6.10.

Everything works fine but when I try to copy a file of huge size
(about 100MB), the following debug messages are getting displayed on
the console:

Fc3: drivers/block/ll_rw_blk.c: 2351: spin_lock already locked by the drivers.
Fc3: drivers/block/ll_rw_blk.c: 2468: spin_unlock not locked by the drivers.

In spite of these debug messages; the file is getting copied successfully.
I studied the Block driver 16th chapter in LDD third edition.

Can any one provide a pointer to these debug messages. Do I need to
implement any patches for the kernel.

Regards,
Srinivas G.
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