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

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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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Stephen M. Cameron 2013-09-23 13:34:12 -05:00 • committed by James Bottomley

parent e06c8e5c34

commit 0390f0c0df

2 changed files with 47 additions and 2 deletions

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44

drivers/scsi/hpsa.c

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5

drivers/scsi/hpsa.h

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