diff options
Diffstat (limited to 'drivers/scsi/NCR5380.c')
| -rw-r--r-- | drivers/scsi/NCR5380.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index ce577f413328..0e00d487ceb4 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -1759,9 +1759,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) unsigned char msgout = NOP; int sink = 0; int len; -#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) int transfersize; -#endif unsigned char *data; unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; struct scsi_cmnd *cmd; @@ -1854,13 +1852,17 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) } else #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ { - spin_unlock_irq(&hostdata->lock); - NCR5380_transfer_pio(instance, &phase, - (int *)&cmd->SCp.this_residual, + /* Break up transfer into 3 ms chunks, + * presuming 6 accesses per handshake. + */ + transfersize = min((unsigned long)cmd->SCp.this_residual, + hostdata->accesses_per_ms / 2); + len = transfersize; + NCR5380_transfer_pio(instance, &phase, &len, (unsigned char **)&cmd->SCp.ptr); - spin_lock_irq(&hostdata->lock); + cmd->SCp.this_residual -= transfersize - len; } - break; + return; case PHASE_MSGIN: len = 1; data = &tmp; |