diff options
| -rw-r--r-- | drivers/scsi/g_NCR5380.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c index c34fc91ba486..fbb28ed0fce8 100644 --- a/drivers/scsi/g_NCR5380.c +++ b/drivers/scsi/g_NCR5380.c @@ -76,6 +76,7 @@ #define IRQ_AUTO 254 #define MAX_CARDS 8 +#define DMA_MAX_SIZE 32768 /* old-style parameters for compatibility */ static int ncr_irq = -1; @@ -629,23 +630,16 @@ static inline int generic_NCR5380_pwrite(struct NCR5380_hostdata *hostdata, static int generic_NCR5380_dma_xfer_len(struct NCR5380_hostdata *hostdata, struct scsi_cmnd *cmd) { - int transfersize = cmd->transfersize; + int transfersize = cmd->SCp.this_residual; if (hostdata->flags & FLAG_NO_PSEUDO_DMA) return 0; - /* Limit transfers to 32K, for xx400 & xx406 - * pseudoDMA that transfers in 128 bytes blocks. - */ - if (transfersize > 32 * 1024 && cmd->SCp.this_residual && - !(cmd->SCp.this_residual % transfersize)) - transfersize = 32 * 1024; - /* 53C400 datasheet: non-modulo-128-byte transfers should use PIO */ if (transfersize % 128) transfersize = 0; - return transfersize; + return min(transfersize, DMA_MAX_SIZE); } /* |