diff options
Diffstat (limited to 'drivers/ide/ide-dma.c')
| -rw-r--r-- | drivers/ide/ide-dma.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c index 7caafab9b..7158d3461 100644 --- a/drivers/ide/ide-dma.c +++ b/drivers/ide/ide-dma.c @@ -226,6 +226,9 @@ static int ide_build_sglist (ide_hwif_t *hwif, struct request *rq) unsigned char *virt_addr = bh->b_data; unsigned int size = bh->b_size; + if (nents >= PRD_ENTRIES) + return 0; + while ((bh = bh->b_reqnext) != NULL) { if ((virt_addr + size) != (unsigned char *) bh->b_data) break; @@ -259,6 +262,9 @@ int ide_build_dmatable (ide_drive_t *drive, ide_dma_action_t func) HWIF(drive)->sg_nents = i = ide_build_sglist(HWIF(drive), HWGROUP(drive)->rq); + if (!i) + return 0; + sg = HWIF(drive)->sg_table; while (i && sg_dma_len(sg)) { u32 cur_addr; @@ -274,7 +280,7 @@ int ide_build_dmatable (ide_drive_t *drive, ide_dma_action_t func) */ while (cur_len) { - if (++count >= PRD_ENTRIES) { + if (count++ >= PRD_ENTRIES) { printk("%s: DMA table too small\n", drive->name); pci_unmap_sg(HWIF(drive)->pci_dev, HWIF(drive)->sg_table, |