[PATCH 2/3] mmc: davinci: Handle errors from optional IRQ lookup

[phucduc.bui at gmail.com]

From: bui duc phuc <phucduc.bui at gmail.com>

platform_get_irq_optional() returns a positive IRQ number on success or
a negative error code on failure. For an optional IRQ, -ENXIO indicates
that no optional IRQ is available. Other errors, such as -EPROBE_DEFER
and -EINVAL, should be propagated so that the caller can handle them
appropriately.

However, the driver currently stores the return value directly in
host->sdio_irq and continues probing.

Propagate negative errors other than -ENXIO, and only assign the IRQ to
host->sdio_irq when a valid IRQ number is returned.

Signed-off-by: bui duc phuc <phucduc.bui at gmail.com>
---
 drivers/mmc/host/davinci_mmc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index cdb9fa94b56d..4765d2dee599 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -1248,7 +1248,11 @@ static int davinci_mmcsd_probe(struct platform_device *pdev)
 
 	host->use_dma = use_dma;
 	host->mmc_irq = irq;
-	host->sdio_irq = platform_get_irq_optional(pdev, 1);
+	ret = platform_get_irq_optional(pdev, 1);
+	if (ret < 0 && ret != -ENXIO)
+		return ret;
+	if (ret > 0)
+		host->sdio_irq = ret;
 
 	if (host->use_dma) {
 		ret = davinci_acquire_dma_channels(host);
-- 
2.43.0