From: Karsten Graul <kgraul@linux.ibm.com>
Date: Wed, 7 Oct 2020 22:57:43 +0200
Subject: net/smc: restore smcd_version when all ISM V2 devices failed to init
Git-commit: f29fa003996da1b9a133713db9fb5a344eaada4f
Patch-mainline: v5.10-rc1
References: jsc#SLE-13761
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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
net/smc/af_smc.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- 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_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(
}
/* 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(
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;