The NCR53c406a scsi driver normally does not use DMA, unless
the USE_PIO macro is disabled by modifying the source code.
The call to free_dma() for some reason uses #ifdef USE_DMA,
which does not do the right thing, since USE_DMA is defined
as a boolean that is either 0 or 1, but always present.
One case where it gets in the way is randconfig builds on ARM,
which depending on the configuration does not provide a free_dma()
function, causing this build error:
drivers/scsi/NCR53c406a.c: In function 'NCR53c406a_release':
drivers/scsi/NCR53c406a.c:600:3: error: implicit declaration of function 'free_dma' [-Werror=implicit-function-declaration]
free_dma(shost->dma_channel);
^
This changes the code to use #if USE_DMA, to match the
rest of the file, which seems to be what the author intended.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
drivers/scsi/NCR53c406a.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/NCR53c406a.c b/drivers/scsi/NCR53c406a.c
index c91888a..2c78785 100644
--- a/drivers/scsi/NCR53c406a.c
+++ b/drivers/scsi/NCR53c406a.c
@@ -595,7 +595,7 @@ static int NCR53c406a_release(struct Scsi_Host *shost)
{
if (shost->irq)
free_irq(shost->irq, NULL);
-#ifdef USE_DMA
+#if USE_DMA
if (shost->dma_channel != 0xff)
free_dma(shost->dma_channel);
#endif
--
1.8.3.2
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