[PATCH] pata_ep93xx: fix deferred probing

The driver overrides the error codes returned by platform_get_irq() to
-ENXIO, so if it returns -EPROBE_DEFER, the driver would fail the probe
permanently instead of the deferred probing. Switch to propagating the
error code upstream, still checking/overriding IRQ0 as libata regards it
as "no IRQ" (thus polling) anyway...

Fixes: 2fff27512600 ("PATA host controller driver for ep93xx")
Signed-off-by: Sergey Shtylyov <redacted>

---
This patch is against the 'master' branch of Jens Axboe's 'linux-block.git'
repo.

 drivers/ata/pata_ep93xx.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: linux-block/drivers/ata/pata_ep93xx.c
===================================================================

--- linux-block.orig/drivers/ata/pata_ep93xx.c
+++ linux-block/drivers/ata/pata_ep93xx.c

@@ -928,7 +928,11 @@ static int ep93xx_pata_probe(struct plat
 	/* INT[3] (IRQ_EP93XX_EXT3) line connected as pull down */
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		err = -ENXIO;
+		err = irq;
+		goto err_rel_gpio;
+	}
+	if (!irq) {
+		err = -EINVAL;
 		goto err_rel_gpio;
 	}