net/smc: restore smcd_version when all ISM V2 devices failed to init

Field ini->smcd_version is set to SMC_V2 before calling
smc_listen_ism_init(). This clears the V1 bit that may be set. When all
matching ISM V2 devices fail to initialize then the smcd_version field
needs to get restored to allow any possible V1 devices to initialize.
And be consistent, always go to the not_found label when no device was
found.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index f481f0e..82be0bd 100644 (file)
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1481,11 +1481,12 @@ static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
        struct smc_clc_v2_extension *smc_v2_ext;
        struct smc_clc_msg_smcd *pclc_smcd;
        unsigned int matches = 0;
+       u8 smcd_version;
        u8 *eid = NULL;
        int i;
 
        if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
-               return;
+               goto not_found;
 
        pclc_smcd = smc_get_clc_msg_smcd(pclc);
        smc_v2_ext = smc_get_clc_v2_ext(pclc);
@@ -1519,6 +1520,7 @@ static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
        }
 
        /* separate - outside the smcd_dev_list.lock */
+       smcd_version = ini->smcd_version;
        for (i = 0; i < matches; i++) {
                ini->smcd_version = SMC_V2;
                ini->is_smcd = true;
@@ -1528,6 +1530,8 @@ static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
                        continue;
                return; /* matching and usable V2 ISM device found */
        }
+       /* no V2 ISM device could be initialized */
+       ini->smcd_version = smcd_version;       /* restore original value */
 
 not_found:
        ini->smcd_version &= ~SMC_V2;