ata: libahci: properly propagate return value of platform_get_irq()

[ Upstream commit c034640a32f8456018d9c8c83799ead683046b95 ]

When platform_get_irq() fails, it returns an error code, which
libahci_platform and replaces it by -EINVAL. This commit fixes that by
propagating the error code. It fixes the situation where
platform_get_irq() returns -EPROBE_DEFER because the interrupt
controller is not available yet, and generally looks like the right
thing to do.

We pay attention to not show the "no irq" message when we are in an
EPROBE_DEFER situation, because the driver probing will be retried
later on, once the interrupt controller becomes available to provide
the interrupt.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index aaa761b9081cc02a75792302c741f7b54ebd9823..cd2eab6aa92ea245e1a3dab839be7fe8aa938cdb 100644 (file)
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -514,8 +514,9 @@ int ahci_platform_init_host(struct platform_device *pdev,
 
        irq = platform_get_irq(pdev, 0);
        if (irq <= 0) {
-               dev_err(dev, "no irq\n");
-               return -EINVAL;
+               if (irq != -EPROBE_DEFER)
+                       dev_err(dev, "no irq\n");
+               return irq;
        }
 
        hpriv->irq = irq;