Messages in this thread | | | Date | Sat, 15 Dec 2007 13:07:01 -0800 (PST) | From | a_kumar <> | Subject | problem with ending requests asynchronously in my block device driver |
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Hi,
I've a block device driver which does the following,
Inside the request function I do something like this: request(fn) {
while ((req = elv_next_request(q)) != NULL) { ....................set up the request; spin_unlock_irq(q->queue_lock); call the transfer(set_up_req) function; spin_lock_irq(q->queue_lock); } spin_unlock_irq (q->queue_lock); /* allow callback to execute as it needs the lock!!! */ spin_lock_irq (q->queue_lock);
} and the transfer function calls the scsi_execute_asyn(....) with the callback function doing the end request. So, the ending of the request is done like below:
callback(fn) {
spin_lock_irqsave(q->queue_lock, flags); if (!end_that_request_first(set_up_req->req, cmpstatus, set_up_req->req->nr_sectors)) { add_disk_randomness(...); end_that_request_last(set_up_req->req,0); } spin_unlock_irqrestore(q->queue_lock, flags); }
This code works fine with most of the kernel versions, but fails on some like , Linux 2.6.18-8.el5-xen
Please help me to find out where I'm going wrong?
Thanks in advance for an early reply. Anil P.
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