linux-kernel - [PATCH v3] soc: fsl: qe: Add check for ioremap

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Date:   Tue, 11 Oct 2022 14:52:25 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     christophe.leroy@...roup.eu, qiang.zhao@....com, leoyang.li@....com
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v3] soc: fsl: qe: Add check for ioremap

As ioremap can return NULL pointer, it should
be better to check the return value return error
if fails.
Moreover, the return value of qe_reset should be
checked by cascade.

Fixes: 68f047e3d62e ("fsl/qe: add rx_sync and tx_sync for TDM mode")
Suggested-by: Christophe Leroy <christophe.leroy@...roup.eu>
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Changelog:

v2 -> v3:

1. Add return statement of qe_reset when CONFIG_QUICC_ENGINE is not selected.

v1 -> v2:

1. Change the position of the check for ioremap.
2. Simplify the check for qe_reset.
3. Remove the 'extern' keyword.
---
 drivers/soc/fsl/qe/qe.c | 12 ++++++++----
 include/soc/fsl/qe/qe.h |  7 +++++--
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/fsl/qe/qe.c b/drivers/soc/fsl/qe/qe.c
index b3c226eb5292..33f76cc5872e 100644
--- a/drivers/soc/fsl/qe/qe.c
+++ b/drivers/soc/fsl/qe/qe.c
@@ -83,11 +83,14 @@ static phys_addr_t get_qe_base(void)
 	return qebase;
 }
 
-void qe_reset(void)
+int qe_reset(void)
 {
 	if (qe_immr == NULL)
 		qe_immr = ioremap(get_qe_base(), QE_IMMAP_SIZE);
 
+	if (qe_immr == NULL)
+		return -ENOMEM;
+
 	qe_snums_init();
 
 	qe_issue_cmd(QE_RESET, QE_CR_SUBBLOCK_INVALID,
@@ -98,6 +101,8 @@ void qe_reset(void)
 
 	if (qe_sdma_init())
 		panic("sdma init failed!");
+
+	return 0;
 }
 
 int qe_issue_cmd(u32 cmd, u32 device, u8 mcn_protocol, u32 cmd_input)
@@ -644,9 +649,8 @@ static int __init qe_init(void)
 	np = of_find_compatible_node(NULL, NULL, "fsl,qe");
 	if (!np)
 		return -ENODEV;
-	qe_reset();
 	of_node_put(np);
-	return 0;
+	return qe_reset();
 }
 subsys_initcall(qe_init);
 
@@ -654,7 +658,7 @@ subsys_initcall(qe_init);
 static int qe_resume(struct platform_device *ofdev)
 {
 	if (!qe_alive_during_sleep())
-		qe_reset();
+		return qe_reset();
 	return 0;
 }
 
diff --git a/include/soc/fsl/qe/qe.h b/include/soc/fsl/qe/qe.h
index b02e9fe69146..0714b0ba7f49 100644
--- a/include/soc/fsl/qe/qe.h
+++ b/include/soc/fsl/qe/qe.h
@@ -84,9 +84,12 @@ extern spinlock_t cmxgcr_lock;
 
 /* Export QE common operations */
 #ifdef CONFIG_QUICC_ENGINE
-extern void qe_reset(void);
+int qe_reset(void);
 #else
-static inline void qe_reset(void) {}
+static inline int qe_reset(void)
+{
+	return 0;
+}
 #endif
 
 int cpm_muram_init(void);
-- 
2.25.1