From eeee322647a67c20d9277c5e02c42b2126ea74bc Mon Sep 17 00:00:00 2001
From: Matthew Wilcox <matthew.r.wilcox@intel.com>
Date: Mon, 14 Feb 2011 15:55:33 -0500
Subject: [PATCH] NVMe: Handle failures differently in nvme_submit_bio_queue()

Return -EBUSY if the queue is full or -ENOMEM if we failed to allocate
memory (or map a scatterlist).  Also use GFP_ATOMIC to allocate the
nvme_bio and move the locking to the callers of nvme_submit_bio_queue().

In nvme_make_request(), don't permit an I/O to jump the queue -- if the
congestion list already has an entry, just add to the tail, rather than
trying to submit.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
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