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| author | Brian King | 2010-04-20 21:21:33 +0200 |
|---|---|---|
| committer | James Bottomley | 2010-05-02 17:03:03 +0200 |
| commit | f5832fa2f8dc39adcf3ae348d2d6383163235e79 (patch) | |
| tree | 1fea25c52248b213dd44d2ad693959ff29d56495 /tools | |
| parent | [SCSI] hpsa: remove unneeded defines (diff) | |
| download | kernel-qcow2-linux-f5832fa2f8dc39adcf3ae348d2d6383163235e79.tar.gz kernel-qcow2-linux-f5832fa2f8dc39adcf3ae348d2d6383163235e79.tar.xz kernel-qcow2-linux-f5832fa2f8dc39adcf3ae348d2d6383163235e79.zip | |
[SCSI] ibmvfc: Fix command completion handling
Commands which are completed by the VIOS are placed on a CRQ
in kernel memory for the ibmvfc driver to process. Each CRQ
entry is 16 bytes. The ibmvfc driver reads the first 8 bytes
to check if the entry is valid, then reads the next 8 bytes to get
the handle, which is a pointer the completed command. This fixes
an issue seen on Power 7 where the processor reordered the
loads from memory, resulting in processing command completion
with a stale handle. This could result in command timeouts,
and also early completion of commands.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions