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| author | Douglas Gilbert <dougg@torque.net> | 2005-09-09 11:18:57 +0400 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.(none)> | 2005-09-10 01:37:05 +0400 |
| commit | 1c8e71d72026ed4c6ba0fdfd7eebd865f4fd1415 (patch) | |
| tree | 00e9cffc0b33d72a19cb1699d9fa5d32696a5a2b /drivers/block/scsi_ioctl.c | |
| parent | 788ce43aa1ad7158f894b6bb3df8ba2f63794c20 (diff) | |
| download | linux-1c8e71d72026ed4c6ba0fdfd7eebd865f4fd1415.tar.xz | |
[SCSI] sg: do not set VM_IO flag on mmap-ed pages
Further to the problem discussed in this post:
http://marc.theaimsgroup.com/?l=linux-scsi&m=112540053711489&w=2
It seems that the sg driver does not need to set the VM_IO flag
on pages that it memory maps to the user space since they are
not from the IO space. Ahmed Teirelbar <ahmed.teirelbar@adic.com>
wants the facility and has tested this patch as I have without
adverse effects.
The oops protection is still important. Some users really did
try and use dio transfers from the sg driver to memory mapped
IO space (on a video capture card if my memory serves) during the
lk 2.4 series. I'm not sure how successful it was but that will
now be politely refused in lk 2.6.13+ .
Changelog:
- set the page flags for sg's reserved buffer mmap-ed
to the user space to VM_RESERVED (rather than
VM_RESERVED | VM_IO )
Signed-off-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/block/scsi_ioctl.c')
0 files changed, 0 insertions, 0 deletions