[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, 24 insertions, 9 deletions

diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c
index 211ec7eebc9c..e6c8e89c226f 100644
--- a/drivers/scsi/sata_sil24.c
+++ b/drivers/scsi/sata_sil24.c
@@ -635,6 +635,13 @@ static irqreturn_t sil24_interrupt(int irq, void *dev_instance, struct pt_regs *
         return IRQ_RETVAL(handled);
 }
 
+static inline void sil24_cblk_free(struct sil24_port_priv *pp, struct device *dev)
+{
+        const size_t cb_size = sizeof(*pp->cmd_block);
+
+        dma_free_coherent(dev, cb_size, pp->cmd_block, pp->cmd_block_dma);
+}
+
 static int sil24_port_start(struct ata_port *ap)
 {
         struct device *dev = ap->host_set->dev;
@@ -642,36 +649,44 @@ static int sil24_port_start(struct ata_port *ap)
         struct sil24_cmd_block *cb;
         size_t cb_size = sizeof(*cb);
         dma_addr_t cb_dma;
+        int rc = -ENOMEM;
 
-        pp = kmalloc(sizeof(*pp), GFP_KERNEL);
+        pp = kzalloc(sizeof(*pp), GFP_KERNEL);
         if (!pp)
-                return -ENOMEM;
-        memset(pp, 0, sizeof(*pp));
+                goto err_out;
 
         pp->tf.command = ATA_DRDY;
 
         cb = dma_alloc_coherent(dev, cb_size, &cb_dma, GFP_KERNEL);
-        if (!cb) {
-                kfree(pp);
-                return -ENOMEM;
-        }
+        if (!cb)
+                goto err_out_pp;
         memset(cb, 0, cb_size);
 
+        rc = ata_pad_alloc(ap, dev);
+        if (rc)
+                goto err_out_pad;
+
         pp->cmd_block = cb;
         pp->cmd_block_dma = cb_dma;
 
         ap->private_data = pp;
 
         return 0;
+
+err_out_pad:
+        sil24_cblk_free(pp, dev);
+err_out_pp:
+        kfree(pp);
+err_out:
+        return rc;
 }
 
 static void sil24_port_stop(struct ata_port *ap)
 {
         struct device *dev = ap->host_set->dev;
         struct sil24_port_priv *pp = ap->private_data;
-        size_t cb_size = sizeof(*pp->cmd_block);
 
-        dma_free_coherent(dev, cb_size, pp->cmd_block, pp->cmd_block_dma);
+        sil24_cblk_free(pp, dev);
         kfree(pp);
 }