From: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/g_NCR5380.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index de5147a..76e3745 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -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;
--
2.7.3
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