ncr5380: Split NCR5380_init() into two functions
authorFinn Thain <fthain@telegraphics.com.au>
Sun, 3 Jan 2016 05:05:08 +0000 (16:05 +1100)
committerMartin K. Petersen <martin.petersen@oracle.com>
Thu, 7 Jan 2016 02:42:52 +0000 (21:42 -0500)
commitb6488f97d3b5b602a066956e58a1ba282456d79b
tree1ca8032c303d20869e0955f962c3747fbb297322
parentb01ec34895720348dab7eae6bfb28a5799130bce
ncr5380: Split NCR5380_init() into two functions

This patch splits the NCR5380_init() function into two parts, similar
to the scheme used with atari_NCR5380.c. This avoids two problems.

Firstly, NCR5380_init() may perform a bus reset, which would cause the
chip to assert IRQ. The chip is unable to mask its bus reset interrupt.
Drivers can't call request_irq() before calling NCR5380_init(), because
initialization must happen before the interrupt handler executes. If
driver initialization causes an interrupt it may be problematic on some
platforms. To avoid that, first move the bus reset code into
NCR5380_maybe_reset_bus().

Secondly, NCR5380_init() contains some board-specific interrupt setup code
for the NCR53C400 that does not belong in the core driver. In moving this
code, better not re-order interrupt initialization and bus reset. Again,
the solution is to move the bus reset code into NCR5380_maybe_reset_bus().

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
drivers/scsi/NCR5380.c
drivers/scsi/NCR5380.h
drivers/scsi/arm/cumana_1.c
drivers/scsi/arm/oak.c
drivers/scsi/dmx3191d.c
drivers/scsi/dtc.c
drivers/scsi/g_NCR5380.c
drivers/scsi/pas16.c
drivers/scsi/t128.c