Commit 89fa9b5c authored Dec 05, 2016 by Ondrej Zary Committed by Martin K. Petersen Dec 08, 2016

scsi: g_NCR5380: Check for chip presence before calling NCR5380_init()



Write and read back mode register to check that a chip is really there.
If no card is present, reads result in 0xff.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

parent f5b893c9

drivers/scsi/g_NCR5380.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -248,6 +248,13 @@ static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
		}
		}

		/* Check for vacant slot */
		NCR5380_write(MODE_REG, 0);
		if (NCR5380_read(MODE_REG) != 0) {
		ret = -ENODEV;
		goto out_unregister;
		}

		ret = NCR5380_init(instance, flags \| FLAG_LATE_DMA_SETUP);
		if (ret)
		goto out_unregister;