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staging/rdma/hfi1: Wrong cast breaks desired pointer arithmetic 

The address being mapped into a process's memory for notification events was
improperly calculated due to cast that was happening too early. dd->events is a
pointer and should have been casted to unsigned long after the pointer
arithmetic was done, not before.

As a result, processes were looking at the wrong place and not seeing their
notification events.

Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mitko Haralanov 2015-10-26 10:28:39 -04:00 committed by Greg Kroah-Hartman
parent b9fb6318d0
commit 3c6c065a51
1 changed files with 3 additions and 3 deletions
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6
drivers/staging/rdma/hfi1/file_ops.c
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@ -607,9 +607,9 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
* Use the page where this context's flags are. User level
* knows where it's own bitmap is within the page.
*/
memaddr = ((unsigned long)dd->events +
((uctxt->ctxt - dd->first_user_ctxt) *
HFI1_MAX_SHARED_CTXTS)) & PAGE_MASK;
memaddr = (unsigned long)(dd->events +
((uctxt->ctxt - dd->first_user_ctxt) *
HFI1_MAX_SHARED_CTXTS)) & PAGE_MASK;
memlen = PAGE_SIZE;
/*
* v3.7 removes VM_RESERVED but the effect is kept by