kernel: add comment to explain interrupt

Explain why the handler doesn't clear the interrupt in EIC_ISR even if the documentation regarding this register is saying something different. Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

kernel: add comment to explain interrupt
Explain why the handler doesn't clear the interrupt in EIC_ISR even if the documentation regarding this register is saying something different. Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
85368f14 · Federico Vaga · fcbce05c · 85368f14
Commit 85368f14 authored Jul 04, 2014 by Federico Vaga
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fd-irq.c kernel/fd-irq.c +6 -0

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--- a/kernel/fd-irq.c
+++ b/kernel/fd-irq.c
@@ -258,6 +258,12 @@ static void fd_tlet(unsigned long arg)
 	}
 }

+/*
+ * fd_irq_handler
+ * NOTE: TS_BUF_NOTEMPTY interrupt is level sensitive, it is cleared when
+ * you read the whole fifo buffer. It is useless to clear the interrupt
+ * in EIC_ISR
+ */
 irqreturn_t fd_irq_handler(int irq, void *dev_id)
 {
 	struct fmc_device *fmc = dev_id;