RDMA/erdma: Eliminate unnecessary casting of EQ doorbells

Using void * to define EQ doorbell pointer can eliminate unnecessary
casting when performing assignment. Also rename *db_addr* to *db* for a
shorter name.
Signed-off-by: Cheng Xu <chengyou@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230322093319.84045-3-chengyou@linux.alibaba.comSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/erdma/erdma.h

@@ -32,7 +32,7 @@ struct erdma_eq {
 	atomic64_t event_num;
 	atomic64_t notify_num;
 
-	u64 __iomem *db_addr;
+	void __iomem *db;
 	u64 *db_record;
 };
 

drivers/infiniband/hw/erdma/erdma_cmdq.c

@@ -166,8 +166,7 @@ static int erdma_cmdq_eq_init(struct erdma_dev *dev)
 	spin_lock_init(&eq->lock);
 	atomic64_set(&eq->event_num, 0);
 
-	eq->db_addr =
-		(u64 __iomem *)(dev->func_bar + ERDMA_REGS_CEQ_DB_BASE_REG);
+	eq->db = dev->func_bar + ERDMA_REGS_CEQ_DB_BASE_REG;
 	eq->db_record = (u64 *)(eq->qbuf + buf_size);
 
 	erdma_reg_write32(dev, ERDMA_REGS_CMDQ_EQ_ADDR_H_REG,

drivers/infiniband/hw/erdma/erdma_eq.c

@@ -14,7 +14,7 @@ void notify_eq(struct erdma_eq *eq)
 		      FIELD_PREP(ERDMA_EQDB_ARM_MASK, 1);
 
 	*eq->db_record = db_data;
-	writeq(db_data, eq->db_addr);
+	writeq(db_data, eq->db);
 
 	atomic64_inc(&eq->notify_num);
 }
@@ -98,7 +98,7 @@ int erdma_aeq_init(struct erdma_dev *dev)
 	atomic64_set(&eq->event_num, 0);
 	atomic64_set(&eq->notify_num, 0);
 
-	eq->db_addr = (u64 __iomem *)(dev->func_bar + ERDMA_REGS_AEQ_DB_REG);
+	eq->db = dev->func_bar + ERDMA_REGS_AEQ_DB_REG;
 	eq->db_record = (u64 *)(eq->qbuf + buf_size);
 
 	erdma_reg_write32(dev, ERDMA_REGS_AEQ_ADDR_H_REG,
@@ -243,9 +243,8 @@ static int erdma_ceq_init_one(struct erdma_dev *dev, u16 ceqn)
 	atomic64_set(&eq->notify_num, 0);
 
 	eq->depth = ERDMA_DEFAULT_EQ_DEPTH;
-	eq->db_addr =
-		(u64 __iomem *)(dev->func_bar + ERDMA_REGS_CEQ_DB_BASE_REG +
-				(ceqn + 1) * ERDMA_DB_SIZE);
+	eq->db = dev->func_bar + ERDMA_REGS_CEQ_DB_BASE_REG +
+		 (ceqn + 1) * ERDMA_DB_SIZE;
 	eq->db_record = (u64 *)(eq->qbuf + buf_size);
 	eq->ci = 0;
 	dev->ceqs[ceqn].dev = dev;