[PATCH net-next 01/14] net/smc: Remove error handling of unregister_dmb()

Alexandra Winter
2025-09-05T14:54:41Z

smcd_buf_free() calls smc_ism_unregister_dmb(lgr->smcd, buf_desc) and
then unconditionally frees buf_desc.

Remove the cleaning up of fields of buf_desc in
smc_ism_unregister_dmb(), because it is not helpful.

This removes the only usage of ISM_ERROR from the smc module. So move it
to drivers/s390/net/ism.h.

Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Reviewed-by: Mahanta Jambigi <mjambigi@linux.ibm.com>
---
drivers/s390/net/ism.h | 1 +
include/net/smc.h | 2 --
net/smc/smc_ism.c | 14 +++++---------
net/smc/smc_ism.h | 3 ++-
4 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/s390/net/ism.h b/drivers/s390/net/ism.h
index 047fa6101555..b5b03db52fce 100644
--- a/drivers/s390/net/ism.h
+++ b/drivers/s390/net/ism.h
@@ -10,6 +10,7 @@
#include <asm/pci_insn.h>

#define UTIL_STR_LEN 16
+#define ISM_ERROR 0xFFFF

/*
* Do not use the first word of the DMB bits to ensure 8 byte aligned access.
diff --git a/include/net/smc.h b/include/net/smc.h
index db84e4e35080..a9c023dd1380 100644
--- a/include/net/smc.h
+++ b/include/net/smc.h
@@ -44,8 +44,6 @@ struct smcd_dmb {

#define ISM_RESERVED_VLANID 0x1FFF

-#define ISM_ERROR 0xFFFF
-
struct smcd_dev;

struct smcd_gid {
diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index a58ffb7a0610..fca01b95b65a 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -205,13 +205,13 @@ int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid)
return rc;
}

-int smc_ism_unregister_dmb(struct smcd_dev *smcd, struct smc_buf_desc *dmb_desc)
+void smc_ism_unregister_dmb(struct smcd_dev *smcd,
+ struct smc_buf_desc *dmb_desc)
{
struct smcd_dmb dmb;
- int rc = 0;

if (!dmb_desc->dma_addr)
- return rc;
+ return;

memset(&dmb, 0, sizeof(dmb));
dmb.dmb_tok = dmb_desc->token;
@@ -219,13 +219,9 @@ int smc_ism_unregister_dmb(struct smcd_dev *smcd, struct smc_buf_desc *dmb_desc)
dmb.cpu_addr = dmb_desc->cpu_addr;
dmb.dma_addr = dmb_desc->dma_addr;
dmb.dmb_len = dmb_desc->len;
- rc = smcd->ops->unregister_dmb(smcd, &dmb);
- if (!rc || rc == ISM_ERROR) {
- dmb_desc->cpu_addr = NULL;
- dmb_desc->dma_addr = 0;
- }
+ smcd->ops->unregister_dmb(smcd, &dmb);

- return rc;
+ return;
}

int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h
index 6763133dd8d0..765aa8fae6fa 100644
--- a/net/smc/smc_ism.h
+++ b/net/smc/smc_ism.h
@@ -47,7 +47,8 @@ int smc_ism_get_vlan(struct smcd_dev *dev, unsigned short vlan_id);
int smc_ism_put_vlan(struct smcd_dev *dev, unsigned short vlan_id);
int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size,
struct smc_buf_desc *dmb_desc);
-int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc);
+void smc_ism_unregister_dmb(struct smcd_dev *dev,
+ struct smc_buf_desc *dmb_desc);
bool smc_ism_support_dmb_nocopy(struct smcd_dev *smcd);
int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token,
struct smc_buf_desc *dmb_desc);
--
2.48.1