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| author | Stephen M. Cameron <scameron@beardog.cce.hp.com> | 2013-09-23 20:34:12 +0200 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2013-12-19 16:38:56 +0100 |
| commit | 0390f0c0dfb540149d7369276b17ec53caf506cb (patch) | |
| tree | 2a621fff7b52ca27a9e1a66c168b940d599222f2 /drivers/scsi/hpsa.h | |
| parent | [SCSI] hpsa: add MSA 2040 to list of external target devices (diff) | |
| download | linux-0390f0c0dfb540149d7369276b17ec53caf506cb.tar.xz linux-0390f0c0dfb540149d7369276b17ec53caf506cb.zip | |
[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>
Diffstat (limited to 'drivers/scsi/hpsa.h')
| -rw-r--r-- | drivers/scsi/hpsa.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h index bc85e7244f40..6eabf08ca672 100644 --- a/drivers/scsi/hpsa.h +++ b/drivers/scsi/hpsa.h @@ -114,6 +114,11 @@ struct ctlr_info { struct TransTable_struct *transtable; unsigned long transMethod; + /* cap concurrent passthrus at some reasonable maximum */ +#define HPSA_MAX_CONCURRENT_PASSTHRUS (20) + spinlock_t passthru_count_lock; /* protects passthru_count */ + int passthru_count; + /* * Performant mode completion buffers */ |