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authorFinn Thain <fthain@telegraphics.com.au>2016-01-03 16:05:39 +1100
committerMartin K. Petersen <martin.petersen@oracle.com>2016-01-06 21:43:00 -0500
commitd1af9c7f4a69824440d2d755ddc3b861712ef024 (patch)
tree9bc2ce3c4a693a566352d46cb5ebaa4875fa3ea3 /drivers/scsi/NCR5380.c
parent010e89d18c4e66ab69d64bab439eba988d16fcc9 (diff)
downloadlinux-d1af9c7f4a69824440d2d755ddc3b861712ef024.tar.bz2
ncr5380: Remove UNSAFE macro
Configuring core drivers using macros like this one prevents re-unifying the core driver forks, and prevents implementing the core driver as a library or a platform driver. The UNSAFE macro in particular is a poor workaround for the problem of interrupt latency. Releasing the locks complicates things because then we would have to handle the possibility of EH handler invocation during a PDMA transfer. The comments say that instead of using this macro, "you're going to be better off twiddling with transfersize". I agree. Remove this stuff. 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>
Diffstat (limited to 'drivers/scsi/NCR5380.c')
-rw-r--r--drivers/scsi/NCR5380.c15
1 files changed, 0 insertions, 15 deletions
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 8ff59509585c..1a6562b94bf7 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -195,12 +195,6 @@
* rely on phase mismatch and EOP interrupts to determine end
* of phase.
*
- * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
- * only really want to use this if you're having a problem with
- * dropped characters during high speed communications, and even
- * then, you're going to be better off twiddling with transfersize
- * in the high level code.
- *
* Defaults for these will be provided although the user may want to adjust
* these to allocate CPU resources to the SCSI driver or "real" code.
*
@@ -554,9 +548,6 @@ static void prepare_info(struct Scsi_Host *instance)
#ifdef PSEUDO_DMA
"PSEUDO_DMA "
#endif
-#ifdef UNSAFE
- "UNSAFE "
-#endif
"");
}
@@ -1582,9 +1573,6 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase
* before the setting of DMA mode to after transfer of the last byte.
*/
-#if defined(PSEUDO_DMA) && defined(UNSAFE)
- spin_unlock_irq(instance->host_lock);
-#endif
/* KLL May need eop and parity in 53c400 */
if (hostdata->flags & FLAG_NCR53C400)
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE |
@@ -1793,9 +1781,6 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase
*data = d + c;
*count = 0;
*phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
-#if defined(PSEUDO_DMA) && defined(UNSAFE)
- spin_lock_irq(instance->host_lock);
-#endif /* defined(REAL_DMA_POLL) */
return foo;
#endif /* def REAL_DMA */
}