scsi: sni_53c710: Add IRQ check

[ Upstream commit 1160d61bc51e87e509cfaf9da50a0060f67b6de4 ]

The driver neglects to check the result of platform_get_irq()'s call and
blithely passes the negative error codes to request_irq() (which takes
*unsigned* IRQ #s), causing it to fail with -EINVAL (overridden by -ENODEV
further below).  Stop calling request_irq() with the invalid IRQ #s.

Link: https://lore.kernel.org/r/8f4b8fa5-8251-b977-70a1-9099bcb4bb17@omprussia.ru
Fixes: c27d85f3f3c5 ("[SCSI] SNI RM 53c710 driver")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/scsi/sni_53c710.c b/drivers/scsi/sni_53c710.c
index b0f5220ae23a8b62213551b8e5336fecd351286e..fad68cb028d6b58c08a7651ee7c3cf72198c9645 100644 (file)
--- a/drivers/scsi/sni_53c710.c
+++ b/drivers/scsi/sni_53c710.c
@@ -71,6 +71,7 @@ static int snirm710_probe(struct platform_device *dev)
        struct NCR_700_Host_Parameters *hostdata;
        struct Scsi_Host *host;
        struct  resource *res;
+       int rc;
 
        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
        if (!res)
@@ -96,7 +97,9 @@ static int snirm710_probe(struct platform_device *dev)
                goto out_kfree;
        host->this_id = 7;
        host->base = base;
-       host->irq = platform_get_irq(dev, 0);
+       host->irq = rc = platform_get_irq(dev, 0);
+       if (rc < 0)
+               goto out_put_host;
        if(request_irq(host->irq, NCR_700_intr, IRQF_SHARED, "snirm710", host)) {
                printk(KERN_ERR "snirm710: request_irq failed!\n");
                goto out_put_host;