From 892dd1831392adbdf4e55d0c284c3aea6ba4d855 Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Sun, 6 Aug 2017 00:14:28 +0300 Subject: [PATCH] mtd: nand: atmel: fix of_irq_get() error check of_irq_get() may return 0 as well as negative error number on failure, while the driver only checks for the negative values. The driver would then call devm_request_irq() for IRQ0 in its probe method and never get a valid interrupt. Check for 'nc->irq <= 0' instead and return -ENXIO from the driver's probe if of_irq_get() returned 0. Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver") Signed-off-by: Sergei Shtylyov Acked-by: Wenyou Yang Signed-off-by: Boris Brezillon --- drivers/mtd/nand/atmel/nand-controller.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/mtd/nand/atmel/nand-controller.c b/drivers/mtd/nand/atmel/nand-controller.c index d922a88e407f..6b9d0ba3d707 100644 --- a/drivers/mtd/nand/atmel/nand-controller.c +++ b/drivers/mtd/nand/atmel/nand-controller.c @@ -2078,8 +2078,8 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc) } nc->irq = of_irq_get(nand_np, 0); - if (nc->irq < 0) { - ret = nc->irq; + if (nc->irq <= 0) { + ret = nc->irq ?: -ENXIO; if (ret != -EPROBE_DEFER) dev_err(dev, "Failed to get IRQ number (err = %d)\n", ret); @@ -2168,11 +2168,12 @@ atmel_hsmc_nand_controller_init(struct atmel_hsmc_nand_controller *nc) nc->irq = of_irq_get(np, 0); of_node_put(np); - if (nc->irq < 0) { - if (nc->irq != -EPROBE_DEFER) + if (nc->irq <= 0) { + ret = nc->irq ?: -ENXIO; + if (ret != -EPROBE_DEFER) dev_err(dev, "Failed to get IRQ number (err = %d)\n", - nc->irq); - return nc->irq; + ret); + return ret; } np = of_parse_phandle(dev->of_node, "atmel,nfc-io", 0); -- 2.20.1