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| author | sreekanth.reddy@lsi.com <sreekanth.reddy@lsi.com> | 2012-07-17 15:57:05 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-09-14 10:00:50 -0700 |
| commit | a87c6c9daa67fc9cecd4c65ed4180ede25bc0343 (patch) | |
| tree | 0ab003563c5de21da7d833d003d5a3f79c95ea8f /drivers/scsi/a100u2w.c | |
| parent | b787880f60d492c28a5638bc7c59017c067377d3 (diff) | |
| download | kernel_samsung_smdk4412-a87c6c9daa67fc9cecd4c65ed4180ede25bc0343.tar.gz kernel_samsung_smdk4412-a87c6c9daa67fc9cecd4c65ed4180ede25bc0343.tar.bz2 kernel_samsung_smdk4412-a87c6c9daa67fc9cecd4c65ed4180ede25bc0343.zip | |
SCSI: mpt2sas: Fix for Driver oops, when loading driver with max_queue_depth command line option to a very small value
commit 338b131a3269881c7431234855c93c219b0979b6 upstream.
If the specified max_queue_depth setting is less than the
expected number of internal commands, then driver will calculate
the queue depth size to a negitive number. This negitive number
is actually a very large number because variable is unsigned
16bit integer. So, the driver will ask for a very large amount of
memory for message frames and resulting into oops as memory
allocation routines will not able to handle such a large request.
So, in order to limit this kind of oops, The driver need to set
the max_queue_depth to a scsi mid layer's can_queue value. Then
the overall message frames required for IO is minimum of either
(max_queue_depth plus internal commands) or the IOC global
credits.
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/scsi/a100u2w.c')
0 files changed, 0 insertions, 0 deletions