net: wwan: iosm: fw flashing and cd improvements

1> Function comments moved to .c file.
2> Use literals in return to improve readability.
3> Do error handling check instead of success check.
4> Redundant ret assignment removed.

Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 87 insertions, 103 deletions

diff --git a/drivers/net/wwan/iosm/iosm_ipc_coredump.c b/drivers/net/wwan/iosm/iosm_ipc_coredump.c
index fba3c3454e80..9acd87724c9d 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_coredump.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_coredump.c
@@ -5,7 +5,15 @@
 
 #include "iosm_ipc_coredump.h"
 
-/* Collect coredump data from modem */
+/**
+ * ipc_coredump_collect - To collect coredump
+ * @devlink:            Pointer to devlink instance.
+ * @data:               Pointer to snapshot
+ * @entry:              ID of requested snapshot
+ * @region_size:        Region size
+ *
+ * Returns: 0 on success, error on failure
+ */
 int ipc_coredump_collect(struct iosm_devlink *devlink, u8 **data, int entry,
 			 u32 region_size)
 {
@@ -38,20 +46,27 @@ int ipc_coredump_collect(struct iosm_devlink *devlink, u8 **data, int entry,
 
 	*data = data_ptr;
 
-	return ret;
+	return 0;
+
 get_cd_fail:
 	vfree(data_ptr);
 	return ret;
 }
 
-/* Get coredump list to be collected from modem */
+/**
+ * ipc_coredump_get_list - Get coredump list from modem
+ * @devlink:         Pointer to devlink instance.
+ * @cmd:             RPSI command to be sent
+ *
+ * Returns: 0 on success, error on failure
+ */
 int ipc_coredump_get_list(struct iosm_devlink *devlink, u16 cmd)
 {
 	u32 byte_read, num_entries, file_size;
 	struct iosm_cd_table *cd_table;
 	u8 size[MAX_SIZE_LEN], i;
 	char *filename;
-	int ret = 0;
+	int ret;
 
 	cd_table = kzalloc(MAX_CD_LIST_SIZE, GFP_KERNEL);
 	if (!cd_table) {
diff --git a/drivers/net/wwan/iosm/iosm_ipc_coredump.h b/drivers/net/wwan/iosm/iosm_ipc_coredump.h
index d5028153c8d1..0809ba664276 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_coredump.h
+++ b/drivers/net/wwan/iosm/iosm_ipc_coredump.h
@@ -51,25 +51,9 @@ struct iosm_cd_table {
 	struct iosm_cd_list list;
 } __packed;
 
-/**
- * ipc_coredump_collect - To collect coredump
- * @devlink:		Pointer to devlink instance.
- * @data:		Pointer to snapshot
- * @entry:		ID of requested snapshot
- * @region_size:	Region size
- *
- * Returns: 0 on success, error on failure
- */
 int ipc_coredump_collect(struct iosm_devlink *devlink, u8 **data, int entry,
 			 u32 region_size);
 
-/**
- * ipc_coredump_get_list - Get coredump list
- * @devlink:         Pointer to devlink instance.
- * @cmd:	     RPSI command to be sent
- *
- * Returns: 0 on success, error on failure
- */
 int ipc_coredump_get_list(struct iosm_devlink *devlink, u16 cmd);
 
 #endif /* _IOSM_IPC_COREDUMP_H_ */
diff --git a/drivers/net/wwan/iosm/iosm_ipc_devlink.c b/drivers/net/wwan/iosm/iosm_ipc_devlink.c
index aa1c8c6276dc..42dbe7fe663c 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_devlink.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_devlink.c
@@ -134,11 +134,11 @@ static int ipc_devlink_flash_update(struct devlink *devlink,
 {
 	struct iosm_devlink *ipc_devlink = devlink_priv(devlink);
 	enum iosm_flash_comp_type fls_type;
-	u32 rc = -EINVAL;
+	int rc = -EINVAL;
 	u8 *mdm_rsp;
 
 	if (!params->component)
-		return rc;
+		return -EINVAL;
 
 	mdm_rsp = kzalloc(IOSM_EBL_DW_PACK_SIZE, GFP_KERNEL);
 	if (!mdm_rsp)
@@ -153,11 +153,12 @@ static int ipc_devlink_flash_update(struct devlink *devlink,
 		break;
 	case FLASH_COMP_TYPE_EBL:
 		rc = ipc_flash_boot_ebl(ipc_devlink, params->fw);
-		if (!rc)
-			rc = ipc_flash_boot_set_capabilities(ipc_devlink,
-							     mdm_rsp);
-		if (!rc)
-			rc = ipc_flash_read_swid(ipc_devlink, mdm_rsp);
+		if (rc)
+			break;
+		rc = ipc_flash_boot_set_capabilities(ipc_devlink, mdm_rsp);
+		if (rc)
+			break;
+		rc = ipc_flash_read_swid(ipc_devlink, mdm_rsp);
 		break;
 	case FLASH_COMP_TYPE_FLS:
 		rc = ipc_flash_send_fls(ipc_devlink, params->fw, mdm_rsp);
@@ -185,7 +186,14 @@ static const struct devlink_ops devlink_flash_ops = {
 	.flash_update = ipc_devlink_flash_update,
 };
 
-/* Send command to modem to collect data */
+/**
+ * ipc_devlink_send_cmd - Send command to Modem
+ * @ipc_devlink: Pointer to struct iosm_devlink
+ * @cmd:         Command to be sent to modem
+ * @entry:       Command entry number
+ *
+ * Returns:      0 on success and failure value on error
+ */
 int ipc_devlink_send_cmd(struct iosm_devlink *ipc_devlink, u16 cmd, u32 entry)
 {
 	struct iosm_rpsi_cmd rpsi_cmd;
@@ -199,6 +207,7 @@ int ipc_devlink_send_cmd(struct iosm_devlink *ipc_devlink, u16 cmd, u32 entry)
 					  sizeof(rpsi_cmd));
 }
 
+/* Function to create snapshot */
 static int ipc_devlink_coredump_snapshot(struct devlink *dl,
 					 const struct devlink_region_ops *ops,
 					 struct netlink_ext_ack *extack,
@@ -223,7 +232,8 @@ static int ipc_devlink_coredump_snapshot(struct devlink *dl,
 	if (cd_list->entry == (IOSM_NOF_CD_REGION - 1))
 		ipc_coredump_get_list(ipc_devlink, rpsi_cmd_coredump_end);
 
-	return rc;
+	return 0;
+
 coredump_collect_err:
 	ipc_coredump_get_list(ipc_devlink, rpsi_cmd_coredump_end);
 	return rc;
@@ -270,7 +280,12 @@ static void ipc_devlink_destroy_region(struct iosm_devlink *ipc_devlink)
 		devlink_region_destroy(ipc_devlink->cd_regions[i]);
 }
 
-/* Handle registration to devlink framework */
+/**
+ * ipc_devlink_init - Initialize/register devlink to IOSM driver
+ * @ipc_imem:   Pointer to struct iosm_imem
+ *
+ * Returns:     Pointer to iosm_devlink on success and NULL on failure
+ */
 struct iosm_devlink *ipc_devlink_init(struct iosm_imem *ipc_imem)
 {
 	struct ipc_chnl_cfg chnl_cfg_flash = { 0 };
@@ -335,7 +350,10 @@ devlink_alloc_fail:
 	return NULL;
 }
 
-/* Handle unregistration of devlink */
+/**
+ * ipc_devlink_deinit - To unintialize the devlink from IOSM driver.
+ * @ipc_devlink:        Devlink instance
+ */
 void ipc_devlink_deinit(struct iosm_devlink *ipc_devlink)
 {
 	struct devlink *devlink_ctx = ipc_devlink->devlink_ctx;
diff --git a/drivers/net/wwan/iosm/iosm_ipc_devlink.h b/drivers/net/wwan/iosm/iosm_ipc_devlink.h
index 392735080cb3..fa2b388a2f8a 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_devlink.h
+++ b/drivers/net/wwan/iosm/iosm_ipc_devlink.h
@@ -180,28 +180,10 @@ struct iosm_rpsi_cmd {
 	__le16	crc;
 };
 
-/**
- * ipc_devlink_init - To initialize the devlink to IOSM driver
- * @ipc_imem:	Pointer to struct iosm_imem
- *
- * Returns:	Pointer to iosm_devlink on success and NULL on failure
- */
 struct iosm_devlink *ipc_devlink_init(struct iosm_imem *ipc_imem);
 
-/**
- * ipc_devlink_deinit - To unintialize the devlink from IOSM driver.
- * @ipc_devlink:	Devlink instance
- */
 void ipc_devlink_deinit(struct iosm_devlink *ipc_devlink);
 
-/**
- * ipc_devlink_send_cmd - Send command to Modem
- * @ipc_devlink: Pointer to struct iosm_devlink
- * @cmd:	 Command to be sent to modem
- * @entry:	 Command entry number
- *
- * Returns:	 0 on success and failure value on error
- */
 int ipc_devlink_send_cmd(struct iosm_devlink *ipc_devlink, u16 cmd, u32 entry);
 
 #endif /* _IOSM_IPC_DEVLINK_H */
diff --git a/drivers/net/wwan/iosm/iosm_ipc_flash.c b/drivers/net/wwan/iosm/iosm_ipc_flash.c
index 3d2f1ec6da00..ebceedf7c9f5 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_flash.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_flash.c
@@ -40,7 +40,6 @@ static int ipc_flash_proc_check_ebl_rsp(void *hdr_rsp, void *payload_rsp)
 {
 	struct iosm_ebl_error  *err_info = payload_rsp;
 	u16 *rsp_code = hdr_rsp;
-	int res = 0;
 	u32 i;
 
 	if (*rsp_code == IOSM_EBL_RSP_BUFF) {
@@ -51,10 +50,10 @@ static int ipc_flash_proc_check_ebl_rsp(void *hdr_rsp, void *payload_rsp)
 				       err_info->error[i].error_code);
 			}
 		}
-		res = -EINVAL;
+		return -EINVAL;
 	}
 
-	return res;
+	return 0;
 }
 
 /* Send data to the modem */
@@ -90,7 +89,12 @@ ipc_free_payload:
 	return ret;
 }
 
-/* Allocate flash channel and read LER data from modem */
+/**
+ * ipc_flash_link_establish - Flash link establishment
+ * @ipc_imem:           Pointer to struct iosm_imem
+ *
+ * Returns:     0 on success and failure value on error
+ */
 int ipc_flash_link_establish(struct iosm_imem *ipc_imem)
 {
 	u8 ler_data[IOSM_LER_RSP_SIZE];
@@ -109,6 +113,7 @@ int ipc_flash_link_establish(struct iosm_imem *ipc_imem)
 
 	if (bytes_read != IOSM_LER_RSP_SIZE)
 		goto devlink_read_fail;
+
 	return 0;
 
 devlink_read_fail:
@@ -179,12 +184,16 @@ ipc_flash_send_rcv:
 	return ret;
 }
 
-/* Set the capabilities for the EBL */
+/**
+ * ipc_flash_boot_set_capabilities  - Set modem boot capabilities in flash
+ * @ipc_devlink:        Pointer to devlink structure
+ * @mdm_rsp:            Pointer to modem response buffer
+ *
+ * Returns:             0 on success and failure value on error
+ */
 int ipc_flash_boot_set_capabilities(struct iosm_devlink *ipc_devlink,
 				    u8 *mdm_rsp)
 {
-	int ret;
-
 	ipc_devlink->ebl_ctx.ebl_sw_info_version =
 			ipc_devlink->ebl_ctx.m_ebl_resp[EBL_RSP_SW_INFO_VER];
 	ipc_devlink->ebl_ctx.m_ebl_resp[EBL_SKIP_ERASE] = IOSM_CAP_NOT_ENHANCED;
@@ -205,10 +214,9 @@ int ipc_flash_boot_set_capabilities(struct iosm_devlink *ipc_devlink,
 	/* Write back the EBL capability to modem
 	 * Request Set Protcnf command
 	 */
-	ret = ipc_flash_send_receive(ipc_devlink, FLASH_SET_PROT_CONF,
+	return ipc_flash_send_receive(ipc_devlink, FLASH_SET_PROT_CONF,
 				     ipc_devlink->ebl_ctx.m_ebl_resp,
 				     IOSM_EBL_RSP_SIZE, mdm_rsp);
-	return ret;
 }
 
 /* Read the SWID type and SWID value from the EBL */
@@ -380,7 +388,14 @@ dl_region_fail:
 	return ret;
 }
 
-/* Flash the individual fls files */
+/**
+ * ipc_flash_send_fls  - Inject Modem subsystem fls file to device
+ * @ipc_devlink:        Pointer to devlink structure
+ * @fw:                 FW image
+ * @mdm_rsp:            Pointer to modem response buffer
+ *
+ * Returns:             0 on success and failure value on error
+ */
 int ipc_flash_send_fls(struct iosm_devlink *ipc_devlink,
 		       const struct firmware *fw, u8 *mdm_rsp)
 {
@@ -420,7 +435,13 @@ ipc_flash_err:
 	return ret;
 }
 
-/* Inject RPSI */
+/**
+ * ipc_flash_boot_psi - Inject PSI image
+ * @ipc_devlink:        Pointer to devlink structure
+ * @fw:                 FW image
+ *
+ * Returns:             0 on success and failure value on error
+ */
 int ipc_flash_boot_psi(struct iosm_devlink *ipc_devlink,
 		       const struct firmware *fw)
 {
@@ -470,7 +491,13 @@ ipc_flash_psi_free:
 	return ret;
 }
 
-/* Inject EBL */
+/**
+ * ipc_flash_boot_ebl  - Inject EBL image
+ * @ipc_devlink:        Pointer to devlink structure
+ * @fw:                 FW image
+ *
+ * Returns:             0 on success and failure value on error
+ */
 int ipc_flash_boot_ebl(struct iosm_devlink *ipc_devlink,
 		       const struct firmware *fw)
 {
diff --git a/drivers/net/wwan/iosm/iosm_ipc_flash.h b/drivers/net/wwan/iosm/iosm_ipc_flash.h
index aee848927228..132d59d60fbe 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_flash.h
+++ b/drivers/net/wwan/iosm/iosm_ipc_flash.h
@@ -211,61 +211,19 @@ struct iosm_flash_data {
 	__le32  msg_length;
 };
 
-/**
- * ipc_flash_boot_psi - Inject PSI image
- * @ipc_devlink:	Pointer to devlink structure
- * @fw:			FW image
- *
- * Returns:             0 on success and failure value on error
- */
 int ipc_flash_boot_psi(struct iosm_devlink *ipc_devlink,
 		       const struct firmware *fw);
 
-/**
- * ipc_flash_boot_ebl  - Inject EBL image
- * @ipc_devlink:        Pointer to devlink structure
- * @fw:			FW image
- *
- * Returns:             0 on success and failure value on error
- */
 int ipc_flash_boot_ebl(struct iosm_devlink *ipc_devlink,
 		       const struct firmware *fw);
 
-/**
- * ipc_flash_boot_set_capabilities  - Set modem bool capabilities in flash
- * @ipc_devlink:        Pointer to devlink structure
- * @mdm_rsp:		Pointer to modem response buffer
- *
- * Returns:             0 on success and failure value on error
- */
 int ipc_flash_boot_set_capabilities(struct iosm_devlink *ipc_devlink,
 				    u8 *mdm_rsp);
 
-/**
- * ipc_flash_link_establish - Flash link establishment
- * @ipc_imem:		Pointer to struct iosm_imem
- *
- * Returns:	0 on success and failure value on error
- */
 int ipc_flash_link_establish(struct iosm_imem *ipc_imem);
 
-/**
- * ipc_flash_read_swid - Get swid during flash phase
- * @ipc_devlink:        Pointer to devlink structure
- * @mdm_rsp:		Pointer to modem response buffer
- *
- * Returns:             0 on success and failure value on error
- */
 int ipc_flash_read_swid(struct iosm_devlink *ipc_devlink, u8 *mdm_rsp);
 
-/**
- * ipc_flash_send_fls  - Inject Modem subsystem fls file to device
- * @ipc_devlink:        Pointer to devlink structure
- * @fw:			FW image
- * @mdm_rsp:		Pointer to modem response buffer
- *
- * Returns:             0 on success and failure value on error
- */
 int ipc_flash_send_fls(struct iosm_devlink *ipc_devlink,
 		       const struct firmware *fw, u8 *mdm_rsp);
 #endif