[PATCH] libata: implement ata_exec_internal_sg()

Sg'ify ata_exec_internal() and call it ata_exec_internal_sg().
Wrapper function around ata_exec_internal_sg() is implemented to
provide ata_exec_internal() interface.

Signed-off-by: Tejun Heo <htejun@gmail.com>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 47c7039..0a5103b 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1042,13 +1042,13 @@ void ata_qc_complete_internal(struct ata_queued_cmd *qc)
 }
 
 /**
- *     ata_exec_internal - execute libata internal command
+ *     ata_exec_internal_sg - execute libata internal command
  *     @dev: Device to which the command is sent
  *     @tf: Taskfile registers for the command and the result
  *     @cdb: CDB for packet command
  *     @dma_dir: Data tranfer direction of the command
- *     @buf: Data buffer of the command
- *     @buflen: Length of data buffer
+ *     @sg: sg list for the data buffer of the command
+ *     @n_elem: Number of sg entries
  *
  *     Executes libata internal command with timeout.  @tf contains
  *     command on entry and result on return.  Timeout and error
@@ -1062,9 +1062,10 @@ void ata_qc_complete_internal(struct ata_queued_cmd *qc)
  *     RETURNS:
  *     Zero on success, AC_ERR_* mask on failure
  */
-unsigned ata_exec_internal(struct ata_device *dev,
-                          struct ata_taskfile *tf, const u8 *cdb,
-                          int dma_dir, void *buf, unsigned int buflen)
+unsigned ata_exec_internal_sg(struct ata_device *dev,
+                             struct ata_taskfile *tf, const u8 *cdb,
+                             int dma_dir, struct scatterlist *sg,
+                             unsigned int n_elem)
 {
        struct ata_port *ap = dev->ap;
        u8 command = tf->command;
@@ -1120,7 +1121,12 @@ unsigned ata_exec_internal(struct ata_device *dev,
        qc->flags |= ATA_QCFLAG_RESULT_TF;
        qc->dma_dir = dma_dir;
        if (dma_dir != DMA_NONE) {
-               ata_sg_init_one(qc, buf, buflen);
+               unsigned int i, buflen = 0;
+
+               for (i = 0; i < n_elem; i++)
+                       buflen += sg[i].length;
+
+               ata_sg_init(qc, sg, n_elem);
                qc->nsect = buflen / ATA_SECT_SIZE;
        }
 
@@ -1203,6 +1209,35 @@ unsigned ata_exec_internal(struct ata_device *dev,
        return err_mask;
 }
 
+/**
+ *     ata_exec_internal_sg - execute libata internal command
+ *     @dev: Device to which the command is sent
+ *     @tf: Taskfile registers for the command and the result
+ *     @cdb: CDB for packet command
+ *     @dma_dir: Data tranfer direction of the command
+ *     @buf: Data buffer of the command
+ *     @buflen: Length of data buffer
+ *
+ *     Wrapper around ata_exec_internal_sg() which takes simple
+ *     buffer instead of sg list.
+ *
+ *     LOCKING:
+ *     None.  Should be called with kernel context, might sleep.
+ *
+ *     RETURNS:
+ *     Zero on success, AC_ERR_* mask on failure
+ */
+unsigned ata_exec_internal(struct ata_device *dev,
+                          struct ata_taskfile *tf, const u8 *cdb,
+                          int dma_dir, void *buf, unsigned int buflen)
+{
+       struct scatterlist sg;
+
+       sg_init_one(&sg, buf, buflen);
+
+       return ata_exec_internal_sg(dev, tf, cdb, dma_dir, &sg, 1);
+}
+
 /**
  *     ata_do_simple_cmd - execute simple internal command
  *     @dev: Device to which the command is sent

diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 2d532da..ca6f36c 100644 (file)
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -58,6 +58,10 @@ extern void ata_port_flush_task(struct ata_port *ap);
 extern unsigned ata_exec_internal(struct ata_device *dev,
                                  struct ata_taskfile *tf, const u8 *cdb,
                                  int dma_dir, void *buf, unsigned int buflen);
+extern unsigned ata_exec_internal_sg(struct ata_device *dev,
+                                    struct ata_taskfile *tf, const u8 *cdb,
+                                    int dma_dir, struct scatterlist *sg,
+                                    unsigned int n_elem);
 extern unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd);
 extern int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
                           unsigned int flags, u16 *id);