diff options
Diffstat (limited to 'drivers/scsi/arcmsr/arcmsr_hba.c')
| -rw-r--r-- | drivers/scsi/arcmsr/arcmsr_hba.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c index ce92d4281da6..f97936d66a6a 100644 --- a/drivers/scsi/arcmsr/arcmsr_hba.c +++ b/drivers/scsi/arcmsr/arcmsr_hba.c @@ -2255,8 +2255,11 @@ static void arcmsr_iop2drv_data_wrote_handle(struct AdapterControlBlock *acb) spin_lock_irqsave(&acb->rqbuffer_lock, flags); prbuffer = arcmsr_get_iop_rqbuffer(acb); - buf_empty_len = (acb->rqbuf_putIndex - acb->rqbuf_getIndex - 1) & - (ARCMSR_MAX_QBUFFER - 1); + if (acb->rqbuf_putIndex >= acb->rqbuf_getIndex) { + buf_empty_len = (ARCMSR_MAX_QBUFFER - 1) - + (acb->rqbuf_putIndex - acb->rqbuf_getIndex); + } else + buf_empty_len = acb->rqbuf_getIndex - acb->rqbuf_putIndex - 1; if (buf_empty_len >= readl(&prbuffer->data_len)) { if (arcmsr_Read_iop_rqbuffer_data(acb, prbuffer) == 0) acb->acb_flags |= ACB_F_IOPDATA_OVERFLOW; |