[PATCH/RFC,5/6] scsi: Add NO_DMA dummies for SCSI DMA mapping API
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Message ID 1517912092-15470-6-git-send-email-geert@linux-m68k.org
State New, archived
Headers show
Series
  • Allow compile-testing NO_DMA
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Commit Message

Geert Uytterhoeven Feb. 6, 2018, 10:14 a.m. UTC
Add dummies for scsi_dma_{,un}map(), to allow compile-testing if
NO_DMA=y.

This prevents the following from showing up later:

    ERROR: "scsi_dma_unmap" [drivers/firewire/firewire-sbp2.ko] undefined!
    ERROR: "scsi_dma_map" [drivers/firewire/firewire-sbp2.ko] undefined!

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
 include/scsi/scsi_cmnd.h | 5 +++++
 1 file changed, 5 insertions(+)

Patch
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diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index d8d4a902a88dedbc..6a123d1dd2f80624 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -171,8 +171,13 @@  extern void scsi_kunmap_atomic_sg(void *virt);
 
 extern int scsi_init_io(struct scsi_cmnd *cmd);
 
+#ifdef CONFIG_SCSI_DMA
 extern int scsi_dma_map(struct scsi_cmnd *cmd);
 extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
+#else /* !CONFIG_SCSI_DMA */
+static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; }
+static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { }
+#endif /* !CONFIG_SCSI_DMA */
 
 static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
 {