[libata] ATAPI pad allocation fixes/cleanup

Use ata_pad_{alloc,free} in two drivers, to factor out common code.

Add ata_pad_{alloc,free} to two other drivers, which needed the padding
but had not been updated.

1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 6225b78fa65b..dcd17e7458ab 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -777,4 +777,17 @@ static inline unsigned int __ac_err_mask(u8 status)
         return mask;
 }
 
+static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
+{
+        ap->pad_dma = 0;
+        ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
+                                     &ap->pad_dma, GFP_KERNEL);
+        return (ap->pad == NULL) ? -ENOMEM : 0;
+}
+
+static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
+{
+        dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
+}
+
 #endif /* __LINUX_LIBATA_H__ */