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ata: sata_dwc_460ex: Check !irq instead of irq == NO_IRQ

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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 <christophe.leroy@csgroup.eu>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
This commit is contained in:
Christophe Leroy 2022-11-11 09:30:46 +01:00 committed by Damien Le Moal
parent aebf1e26a8
commit 01a965d750
1 changed files with 2 additions and 6 deletions
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8
drivers/ata/sata_dwc_460ex.c
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@ -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;
}