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

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Message-Id: <20221008023819.47679-1-jiasheng@iscas.ac.cn>
Date:   Sat,  8 Oct 2022 10:38:18 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     qiang.zhao@....com, leoyang.li@....com
Cc:     linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] 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")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/soc/fsl/qe/qe.c | 23 ++++++++++++++++++-----
 include/soc/fsl/qe/qe.h |  4 ++--
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/soc/fsl/qe/qe.c b/drivers/soc/fsl/qe/qe.c
index b3c226eb5292..88e335e8eef7 100644
--- a/drivers/soc/fsl/qe/qe.c
+++ b/drivers/soc/fsl/qe/qe.c
@@ -83,10 +83,13 @@ static phys_addr_t get_qe_base(void)
 	return qebase;
 }
 
-void qe_reset(void)
+int qe_reset(void)
 {
-	if (qe_immr == NULL)
+	if (qe_immr == NULL) {
 		qe_immr = ioremap(get_qe_base(), QE_IMMAP_SIZE);
+		if (qe_immr == NULL)
+			return -ENOMEM;
+	}
 
 	qe_snums_init();
 
@@ -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)
@@ -640,11 +645,14 @@ EXPORT_SYMBOL(qe_get_num_of_snums);
 static int __init qe_init(void)
 {
 	struct device_node *np;
+	int ret;
 
 	np = of_find_compatible_node(NULL, NULL, "fsl,qe");
 	if (!np)
 		return -ENODEV;
-	qe_reset();
+	ret = qe_reset();
+	if (ret)
+		return ret;
 	of_node_put(np);
 	return 0;
 }
@@ -653,8 +661,13 @@ subsys_initcall(qe_init);
 #if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC_85xx)
 static int qe_resume(struct platform_device *ofdev)
 {
-	if (!qe_alive_during_sleep())
-		qe_reset();
+	int ret;
+
+	if (!qe_alive_during_sleep()) {
+		ret = qe_reset();
+		if (ret)
+			return ret;
+	}
 	return 0;
 }
 
diff --git a/include/soc/fsl/qe/qe.h b/include/soc/fsl/qe/qe.h
index b02e9fe69146..71129b8a5807 100644
--- a/include/soc/fsl/qe/qe.h
+++ b/include/soc/fsl/qe/qe.h
@@ -84,9 +84,9 @@ extern spinlock_t cmxgcr_lock;
 
 /* Export QE common operations */
 #ifdef CONFIG_QUICC_ENGINE
-extern void qe_reset(void);
+extern int qe_reset(void);
 #else
-static inline void qe_reset(void) {}
+static inline int qe_reset(void) {}
 #endif
 
 int cpm_muram_init(void);
-- 
2.25.1