Commit 3c6c065a authored by Mitko Haralanov's avatar Mitko Haralanov Committed by Greg Kroah-Hartman

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: default avatarMitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: default avatarIra Weiny <ira.weiny@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b9fb6318
...@@ -607,7 +607,7 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma) ...@@ -607,7 +607,7 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
* Use the page where this context's flags are. User level * Use the page where this context's flags are. User level
* knows where it's own bitmap is within the page. * knows where it's own bitmap is within the page.
*/ */
memaddr = ((unsigned long)dd->events + memaddr = (unsigned long)(dd->events +
((uctxt->ctxt - dd->first_user_ctxt) * ((uctxt->ctxt - dd->first_user_ctxt) *
HFI1_MAX_SHARED_CTXTS)) & PAGE_MASK; HFI1_MAX_SHARED_CTXTS)) & PAGE_MASK;
memlen = PAGE_SIZE; memlen = PAGE_SIZE;
......
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