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-rw-r--r--drivers/scsi/atari_NCR5380.c16
-rw-r--r--drivers/scsi/atari_scsi.c6
-rw-r--r--drivers/scsi/sun3_scsi.c19
3 files changed, 22 insertions, 19 deletions
diff --git a/drivers/scsi/atari_NCR5380.c b/drivers/scsi/atari_NCR5380.c
index c669098e34e1..4101d2de4333 100644
--- a/drivers/scsi/atari_NCR5380.c
+++ b/drivers/scsi/atari_NCR5380.c
@@ -1857,12 +1857,11 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
d = cmd->SCp.ptr;
}
/* this command setup for dma yet? */
- if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) {
- if (cmd->request->cmd_type == REQ_TYPE_FS) {
- sun3scsi_dma_setup(instance, d, count,
- rq_data_dir(cmd->request));
- sun3_dma_setup_done = cmd;
- }
+ if (sun3_dma_setup_done != cmd &&
+ sun3scsi_dma_xfer_len(count, cmd) > 0) {
+ sun3scsi_dma_setup(instance, d, count,
+ rq_data_dir(cmd->request));
+ sun3_dma_setup_done = cmd;
}
#ifdef SUN3_SCSI_VME
dregs->csr |= CSR_INTR;
@@ -1927,7 +1926,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
#endif
transfersize = NCR5380_dma_xfer_len(instance, cmd, phase);
- if (transfersize >= DMA_MIN_SIZE) {
+ if (transfersize > 0) {
len = transfersize;
cmd->SCp.phase = phase;
if (NCR5380_transfer_dma(instance, &phase,
@@ -2366,7 +2365,8 @@ static void NCR5380_reselect(struct Scsi_Host *instance)
d = tmp->SCp.ptr;
}
/* setup this command for dma if not already */
- if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) {
+ if (sun3_dma_setup_done != tmp &&
+ sun3scsi_dma_xfer_len(count, tmp) > 0) {
sun3scsi_dma_setup(instance, d, count,
rq_data_dir(tmp->request));
sun3_dma_setup_done = tmp;
diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c
index c68e895e971f..41ddd95cebe6 100644
--- a/drivers/scsi/atari_scsi.c
+++ b/drivers/scsi/atari_scsi.c
@@ -83,11 +83,12 @@
#include <scsi/scsi_host.h>
+#define DMA_MIN_SIZE 32
+
/* Definitions for the core NCR5380 driver. */
#define SUPPORT_TAGS
#define MAX_TAGS 32
-#define DMA_MIN_SIZE 32
#define NCR5380_implementation_fields /* none */
@@ -605,6 +606,9 @@ static unsigned long atari_dma_xfer_len(unsigned long wanted_len,
{
unsigned long possible_len, limit;
+ if (wanted_len < DMA_MIN_SIZE)
+ return 0;
+
if (IS_A_TT())
/* TT SCSI DMA can transfer arbitrary #bytes */
return wanted_len;
diff --git a/drivers/scsi/sun3_scsi.c b/drivers/scsi/sun3_scsi.c
index 5551b1623ed6..fd4fad816ad4 100644
--- a/drivers/scsi/sun3_scsi.c
+++ b/drivers/scsi/sun3_scsi.c
@@ -36,12 +36,12 @@
#include <scsi/scsi_host.h>
#include "sun3_scsi.h"
-/* Definitions for the core NCR5380 driver. */
-
-/* #define SUPPORT_TAGS */
/* minimum number of bytes to do dma on */
#define DMA_MIN_SIZE 129
+/* Definitions for the core NCR5380 driver. */
+
+/* #define SUPPORT_TAGS */
/* #define MAX_TAGS 32 */
#define NCR5380_implementation_fields /* none */
@@ -61,7 +61,7 @@
#define NCR5380_dma_residual(instance) \
sun3scsi_dma_residual(instance)
#define NCR5380_dma_xfer_len(instance, cmd, phase) \
- sun3scsi_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO))
+ sun3scsi_dma_xfer_len(cmd->SCp.this_residual, cmd)
#define NCR5380_acquire_dma_irq(instance) (1)
#define NCR5380_release_dma_irq(instance)
@@ -262,14 +262,13 @@ static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
return last_residual;
}
-static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
- struct scsi_cmnd *cmd,
- int write_flag)
+static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted_len,
+ struct scsi_cmnd *cmd)
{
- if (cmd->request->cmd_type == REQ_TYPE_FS)
- return wanted;
- else
+ if (wanted_len < DMA_MIN_SIZE || cmd->request->cmd_type != REQ_TYPE_FS)
return 0;
+
+ return wanted_len;
}
static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data)