From: Max Gurtovoy <maxg@mellanox.com>
Date: Sun, 7 Dec 2014 14:09:56 +0000 (+0200)
Subject: IB/iser: Fix possible SQ overflow
X-Git-Tag: omap-for-v3.19/fixes-rc1~37^2^4~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ec9d4d2310e8fc54fc638e4454271d1fcaefa95;p=pandora-kernel.git

IB/iser: Fix possible SQ overflow

Fix a regression was introduced in commit 6df5a128f0fd ("IB/iser:
Suppress scsi command send completions").

The sig_count was wrongly set to be static variable, thus it is
possible that we won't reach to (sig_count % ISER_SIGNAL_BATCH) == 0
condition (due to races) and the send queue will be overflowed.

Instead keep sig_count per connection. We don't need it to be atomic
as we are safe under the iscsi session frwd_lock taken by libiscsi on
the queuecommand path.

Fixes: 6df5a128f0fd ("IB/iser: Suppress scsi command send completions")
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
---

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