net/smc: fix cleanup for linkgroup setup failures
If an SMC connection to a certain peer is setup the first time, a new linkgroup is created. In case of setup failures, such a linkgroup is unusable and should disappear. As a first step the linkgroup is removed from the linkgroup list in smc_lgr_forget(). There are 2 problems: smc_listen_decline() might be called before linkgroup creation resulting in a crash due to calling smc_lgr_forget() with parameter NULL. If a setup failure occurs after linkgroup creation, the connection is never unregistered from the linkgroup, preventing linkgroup freeing. This patch introduces an enhanced smc_lgr_cleanup_early() function which * contains a linkgroup check for early smc_listen_decline() invocations * invokes smc_conn_free() to guarantee unregistering of the connection. * schedules fast linkgroup removal of the unusable linkgroup And the unused function smcd_conn_free() is removed from smc_core.h. Fixes: 3b2dec26 ("net/smc: restructure client and server code in af_smc") Fixes: 2a0674ff ("net/smc: improve abnormal termination of link groups") Signed-off-by: NUrsula Braun <ubraun@linux.ibm.com> Signed-off-by: NKarsten Graul <kgraul@linux.ibm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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