Subject: Re: [PATCH] RDSRDMA: Fix cleanup of rds_iw_mr_pool

From: Venkat Venkatsubra <[email-masked]>
Date: Thu, 29 Sep 2011 11:51:47 -0700 (PDT)

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 <[email-masked]>
Signed-off-by: Steve Wise <[email-masked]>
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Signed-off-by: Venkat Venkatsubra <[email-masked]>

Venkat