Hi, krzysztof. Any suggestion?
--
BR, Jackie Liu
在 2021/9/1 下午8:35, Jackie Liu 写道:
From: Jackie Liu <liuyun01@xxxxxxxxxx>
The s3c24xx_init_intc() returns an error pointer upon failure, not NULL.
let's add an error pointer check in s3c24xx_handle_irq.
s3c_intc[0] is not NULL or ERR, we can simplify the code.
Fixes: 1f629b7a3ced ("ARM: S3C24XX: transform irq handling into a declarative form")
Signed-off-by: Jackie Liu <liuyun01@xxxxxxxxxx>
---
arch/arm/mach-s3c/irq-s3c24xx.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-s3c/irq-s3c24xx.c b/arch/arm/mach-s3c/irq-s3c24xx.c
index 0c631c14a817..df471d322493 100644
--- a/arch/arm/mach-s3c/irq-s3c24xx.c
+++ b/arch/arm/mach-s3c/irq-s3c24xx.c
@@ -362,11 +362,24 @@ static inline int s3c24xx_handle_intc(struct s3c_irq_intc *intc,
static asmlinkage void __exception_irq_entry s3c24xx_handle_irq(struct pt_regs *regs)
{
do {
- if (likely(s3c_intc[0]))
- if (s3c24xx_handle_intc(s3c_intc[0], regs, 0))
- continue;
+ /* For platform based machines, neither ERR nor NULL can happen here.
+ * The s3c24xx_handle_irq() will be set as IRQ handler iff this succeeds:
+ *
+ * s3c_intc[0] = s3c24xx_init_intc()
+ *
+ * If this fails, the next calls to s3c24xx_init_intc() won't be executed.
+ *
+ * For DT machine, s3c_init_intc_of() could set the IRQ handler without
+ * setting s3c_intc[0] only if it was called with num_ctrl=0. There is no
+ * such code path, so again the s3c_intc[0] will have a valid pointer if
+ * set_handle_irq() is called.
+ *
+ * Therefore in s3c24xx_handle_irq(), the s3c_intc[0] is always something.
+ */
+ if (s3c24xx_handle_intc(s3c_intc[0], regs, 0))
+ continue;
- if (s3c_intc[2])
+ if (!IS_ERR_OR_NULL(s3c_intc[2]))
if (s3c24xx_handle_intc(s3c_intc[2], regs, 64))
continue;
