On Sat, Jul 13, 2013 at 01:55:58AM +0400, Sergei Shtylyov wrote: > Hello. > > On 07/13/2013 01:48 AM, Santosh Shilimkar wrote: > >> DMA bounce limit is the maximum direct DMA'able memory beyond which >> bounce buffers has to be used to perform dma operations. SCSI driver >> relies on dma_mask but its calculation is based on max_*pfn which >> don't have uniform meaning across architectures. So make use of >> dma_max_pfn() which is expected to return the DMAable maximum pfn >> value across architectures. > >> Cc: Russell King <li...@arm.linux.org.uk> >> Cc: linux-scsi@vger.kernel.org > >> Signed-off-by: Santosh Shilimkar <santosh.shilim...@ti.com> >> --- >> drivers/scsi/scsi_lib.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) > >> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c >> index 86d5220..e8275fa 100644 >> --- a/drivers/scsi/scsi_lib.c >> +++ b/drivers/scsi/scsi_lib.c >> @@ -1668,7 +1668,7 @@ u64 scsi_calculate_bounce_limit(struct Scsi_Host >> *shost) >> >> host_dev = scsi_get_device(shost); >> if (host_dev && host_dev->dma_mask) >> - bounce_limit = *host_dev->dma_mask; >> + bounce_limit = dma_max_pfn(host_dev) << PAGE_SHIFT; > > You definitely forgot -1 here.
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