lkml.org 
[lkml]   [2006]   [Aug]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH 5 of 23] IB/ipath - drop requirement that PIO buffers be mmaped write-only
    Date
    From
    Some userlands try to mmap these pages read-write, so accommodate them.

    Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>

    diff --git a/drivers/infiniband/hw/ipath/ipath_file_ops.c b/drivers/infiniband/hw/ipath/ipath_file_ops.c
    --- a/drivers/infiniband/hw/ipath/ipath_file_ops.c Fri Aug 25 11:19:44 2006 -0700
    +++ b/drivers/infiniband/hw/ipath/ipath_file_ops.c Fri Aug 25 11:19:44 2006 -0700
    @@ -992,15 +992,10 @@ static int mmap_piobufs(struct vm_area_s
    pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
    #endif

    - if (vma->vm_flags & VM_READ) {
    - dev_info(&dd->pcidev->dev,
    - "Can't map piobufs as readable (flags=%lx)\n",
    - vma->vm_flags);
    - ret = -EPERM;
    - goto bail;
    - }
    -
    - /* don't allow them to later change to readable with mprotect */
    + /*
    + * don't allow them to later change to readable with mprotect (for when
    + * not initially mapped readable, as is normally the case)
    + */
    vma->vm_flags &= ~VM_MAYREAD;
    vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/
    \
     
     \ /
      Last update: 2006-08-25 20:35    [W:3.179 / U:0.036 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site