Patch "mtd: nand: lpc32xx: fix invalid error handling of a requested irq" has been added to the 4.9-stable tree

Patch "mtd: nand: lpc32xx: fix invalid error handling of a requested irq" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mtd: nand: lpc32xx: fix invalid error handling of a requested irq

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mtd-nand-lpc32xx-fix-invalid-error-handling-of-a-requested-irq.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From cf9e1672a66c49ed8903c01b4c380a2f2dc91b40 Mon Sep 17 00:00:00 2001
From: Vladimir Zapolskiy <vz@mleia.com>
Date: Mon, 5 Dec 2016 03:47:10 +0200
Subject: mtd: nand: lpc32xx: fix invalid error handling of a requested irq

From: Vladimir Zapolskiy <vz@mleia.com>

commit cf9e1672a66c49ed8903c01b4c380a2f2dc91b40 upstream.

Semantics of NR_IRQS is different on machines with SPARSE_IRQ option
disabled or enabled, in the latter case IRQs are allocated starting
at least from the value specified by NR_IRQS and going upwards, so
the check of (irq >= NR_IRQ) to decide about an error code returned by
platform_get_irq() is completely invalid, don't attempt to overrule
irq subsystem in the driver.

The change fixes LPC32xx NAND MLC driver initialization on boot.

Fixes: 8cb17b5ed017 ("irqchip: Add LPC32xx interrupt controller driver")
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/mtd/nand/lpc32xx_mlc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/nand/lpc32xx_mlc.c
+++ b/drivers/mtd/nand/lpc32xx_mlc.c
@@ -776,7 +776,7 @@ static int lpc32xx_nand_probe(struct pla
 	init_completion(&host->comp_controller);
 
 	host->irq = platform_get_irq(pdev, 0);
-	if ((host->irq < 0) || (host->irq >= NR_IRQS)) {
+	if (host->irq < 0) {
 		dev_err(&pdev->dev, "failed to get platform irq\n");
 		res = -EINVAL;
 		goto err_exit3;


Patches currently in stable-queue which might be from vz@mleia.com are

queue-4.9/mtd-nand-lpc32xx-fix-invalid-error-handling-of-a-requested-irq.patch
queue-4.9/arm-dts-imx31-fix-clock-control-module-interrupts-description.patch
queue-4.9/arm-dts-imx31-move-ccm-device-node-to-aips2-bus-devices.patch