linux-kernel - Request-queue not getting process even after calling unplug

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Message-ID: <CAK4r=d6--9FniNQ10Ja0z4hUQHuTnCPjsHJUHDmFP7Eeo8NwAA@mail.gmail.com>
Date:	Sun, 30 Dec 2012 17:02:56 +0530
From:	Vivek Satpute <vivekonline86@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Request-queue not getting process even after calling unplug

Hi All,

I am working on RHEL5.8 (kernel-2.6.18-308) and facing weird behavior
with the IO subsystem.

My testcase requires to form the SCSI request manually and send it
down to the underlying HBA
for further IO processing. To achieve this I have formed the SCSI
request, packed it inside the
new request. Later on I am queuing the request to device's
request-queue using function - elv_add_request( ).
Request is getting queued correctly in a queue. Further I called
unplug on a queue, still it is not getting
processed further by IO scheduler. Request remains stuck in queue itself !

Strange part is, same code is working successfully on other kernel versions,
but I am facing the issue only on kernel-2.6.18-308.

Can anyone help me to understand why request is being stuck in a queue
? How can I debug this further ?

Thanks in advance!
Vivek Satpute
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