diff options
| author | Douglas Gilbert <dougg@torque.net> | 2005-09-09 17:18:57 +1000 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.(none)> | 2005-09-09 16:37:05 -0500 |
| commit | 1c8e71d72026ed4c6ba0fdfd7eebd865f4fd1415 (patch) | |
| tree | 00e9cffc0b33d72a19cb1699d9fa5d32696a5a2b /drivers/scsi/sg.c | |
| parent | 788ce43aa1ad7158f894b6bb3df8ba2f63794c20 (diff) | |
[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/scsi/sg.c')
| -rw-r--r-- | drivers/scsi/sg.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index b1b69d738d08..9ea4765d1d12 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -61,7 +61,7 @@ static int sg_version_num = 30533; /* 2 digits for each component */ #ifdef CONFIG_SCSI_PROC_FS #include <linux/proc_fs.h> -static char *sg_version_date = "20050901"; +static char *sg_version_date = "20050908"; static int sg_proc_init(void); static void sg_proc_cleanup(void); @@ -1299,7 +1299,7 @@ sg_mmap(struct file *filp, struct vm_area_struct *vma) sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */ sfp->mmap_called = 1; } - vma->vm_flags |= (VM_RESERVED | VM_IO); + vma->vm_flags |= VM_RESERVED; vma->vm_private_data = sfp; vma->vm_ops = &sg_mmap_vm_ops; return 0; |