From 01a965d750508cacdfc8aa04e567cbb0692ce649 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Fri, 11 Nov 2022 09:30:46 +0100 Subject: [PATCH] ata: sata_dwc_460ex: Check !irq instead of irq == NO_IRQ NO_IRQ is a relic from the old days. It is not used anymore in core functions. By the way, function irq_of_parse_and_map() returns value 0 on error. In some drivers, NO_IRQ is erroneously used to check the return of irq_of_parse_and_map(). It is not a real bug today because the only architectures using the drivers being fixed by this patch define NO_IRQ as 0, but there are architectures which define NO_IRQ as -1. If one day those architectures start using the non fixed drivers, there will be a problem. Long time ago Linus advocated for not using NO_IRQ, see https://lkml.org/lkml/2005/11/21/221 . He re-iterated the same view recently in https://lkml.org/lkml/2022/10/12/622 So test !irq instead of tesing irq == NO_IRQ. And remove the fallback definition of NO_IRQ at the top of the file. Signed-off-by: Christophe Leroy Signed-off-by: Damien Le Moal --- drivers/ata/sata_dwc_460ex.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c index fd699c5..21d7763 100644 --- a/drivers/ata/sata_dwc_460ex.c +++ b/drivers/ata/sata_dwc_460ex.c @@ -42,10 +42,6 @@ #define sata_dwc_writel(a, v) writel_relaxed(v, a) #define sata_dwc_readl(a) readl_relaxed(a) -#ifndef NO_IRQ -#define NO_IRQ 0 -#endif - #define AHB_DMA_BRST_DFLT 64 /* 16 data items burst length */ enum { @@ -242,7 +238,7 @@ static int sata_dwc_dma_init_old(struct platform_device *pdev, /* Get SATA DMA interrupt number */ hsdev->dma->irq = irq_of_parse_and_map(np, 1); - if (hsdev->dma->irq == NO_IRQ) { + if (!hsdev->dma->irq) { dev_err(dev, "no SATA DMA irq\n"); return -ENODEV; } @@ -1178,7 +1174,7 @@ static int sata_dwc_probe(struct platform_device *ofdev) /* Get SATA interrupt number */ irq = irq_of_parse_and_map(np, 0); - if (irq == NO_IRQ) { + if (!irq) { dev_err(dev, "no SATA DMA irq\n"); return -ENODEV; } -- 2.7.4