Read back MODE_REG after writing it in NCR5380_init() to check if the
chip is really there.
This prevents hang when incorrect I/O address was specified by user.
Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/NCR5380.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 01c0027..ce3156d 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -495,6 +495,11 @@ static int NCR5380_init(struct Scsi_Host *instance, int flags)
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
NCR5380_write(MODE_REG, MR_BASE);
+ /* check if the chip is really there */
+ if (NCR5380_read(MODE_REG) != MR_BASE) {
+ NCR5380_exit(instance);
+ return -ENODEV;
+ }
NCR5380_write(TARGET_COMMAND_REG, 0);
NCR5380_write(SELECT_ENABLE_REG, 0);
--
Ondrej Zary
--
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