[PATCH 5.11 371/601] scsi: sni_53c710: Add IRQ check

Greg Kroah-Hartman
2021-05-12T17:41:48Z

From: Sergey Shtylyov <s.shtylyov@omprussia.ru>

[ 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>
---
drivers/scsi/sni_53c710.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sni_53c710.c b/drivers/scsi/sni_53c710.c
index 9e2e196bc202..97c6f81b1d2a 100644
--- a/drivers/scsi/sni_53c710.c
+++ b/drivers/scsi/sni_53c710.c
@@ -58,6 +58,7 @@ 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)
@@ -83,7 +84,9 @@ 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;
--
2.30.2