From: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Date: Mon, 23 Sep 2013 18:34:12 +0000 (-0500)
Subject: [SCSI] hpsa: cap CCISS_PASSTHRU at 20 concurrent commands.
X-Git-Tag: v3.14-rc1~131^2^2~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0390f0c0dfb540149d7369276b17ec53caf506cb;p=pandora-kernel.git

[SCSI] hpsa: cap CCISS_PASSTHRU at 20 concurrent commands.

Cap CCISS_BIG_PASSTHRU as well.  If an attempt is made
to exceed this, ioctl() will return -1 with errno == EAGAIN.

This is to prevent a userland program from exhausting all of
pci_alloc_consistent memory.  I've only seen this problem when
running a special test program designed to provoke it.  20
concurrent commands via the passthru ioctls (not counting SG_IO)
should be more than enough.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---

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