RDMA/cxgb4: free STAG index when TPT entry write fails

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write_tpt_entry() allocates a new STAG index with c4iw_get_resource() and
bumps stats.stag.cur before programming the entry.  When
write_adapter_mem() fails, it returns the error without releasing the index
or reversing the statistic.  No MR is inserted into rhp->mrs, so
deregistration never reclaims it, leaking the index until device teardown.

Record whether this call allocated the index and, on a failed write, return
it to tpt_table and decrement stats.stag.cur.  Key the rollback on both the
write error and that flag, not the error alone: a non-reset update carries
a caller-owned STAG that this call did not allocate and must not free.

Fixes: ec3eead217 ("RDMA/cxgb4: Remove kfifo usage")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

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Leon Romanovsky 2026-07-26 15:21:44 +03:00

parent 033a79e308

commit fdfb5cea4b

1 changed files with 3 additions and 1 deletions

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drivers/infiniband/hw/cxgb4/mem.c

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