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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: f88fc122cc ("mtd: nand: Cleanup/rework the atmel_nand driver")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Wenyou Yang <Wenyou.yang@microchip.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Sergei Shtylyov 2017-08-06 00:14:28 +03:00 committed by Boris Brezillon
parent fd213b5bae
commit 892dd18313
1 changed files with 7 additions and 6 deletions
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13
drivers/mtd/nand/atmel/nand-controller.c
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@ -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);