# Re: \[PATCH\] RDSRDMA: Fix cleanup of rds\_iw\_mr\_pool

- From: Venkat Venkatsubra \<hidden\>
- Date: 2011-09-29 18:51:59 
- List: netdev
- Page: https://ratatoskr.run/netdev/2011/09/10879640
- Thread: https://ratatoskr.run/netdev/2011/09/10879640/t.md

```text
In the rds_iw_mr_pool struct the free_pinned field keeps track of
memory pinned by free MRs. While this field is incremented properly
upon allocation, it is never decremented upon unmapping. This would
cause the rds_rdma module to crash the kernel upon unloading, by
triggering the BUG_ON in the rds_iw_destroy_mr_pool function.

This change keeps track of the MRs that become unpinned, so that
free_pinned can be decremented appropriately.

Signed-off-by: Jonathan Lallinger <redacted>
Signed-off-by: Steve Wise <redacted>
---

Signed-off-by: Venkat Venkatsubra <redacted>

Venkat
```