mg_disk: fix dependency on libata

Add local copies of ata_id_string() and ata_id_c_string() to mg_disk
so there is no need for the driver to depend on ATA and SCSI.

[ Impact: break dependency on libata by copying ata id string functions ]

Cc: unsik Kim <donari75@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 41 insertions, 5 deletions

diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index ddea8e485cc9..f42fa50d3550 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -412,7 +412,7 @@ config ATA_OVER_ETH
 
 config MG_DISK
         tristate "mGine mflash, gflash support"
-        depends on ARM && ATA && GPIOLIB
+        depends on ARM && GPIOLIB
         help
           mGine mFlash(gFlash) block device driver
 
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c
index 1a4cc968cfee..8e53cae9fa90 100644
--- a/drivers/block/mg_disk.c
+++ b/drivers/block/mg_disk.c
@@ -17,7 +17,7 @@
 #include <linux/fs.h>
 #include <linux/blkdev.h>
 #include <linux/hdreg.h>
-#include <linux/libata.h>
+#include <linux/ata.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
@@ -357,6 +357,42 @@ static irqreturn_t mg_irq(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
+/* local copy of ata_id_string() */
+static void mg_id_string(const u16 *id, unsigned char *s,
+                         unsigned int ofs, unsigned int len)
+{
+        unsigned int c;
+
+        BUG_ON(len & 1);
+
+        while (len > 0) {
+                c = id[ofs] >> 8;
+                *s = c;
+                s++;
+
+                c = id[ofs] & 0xff;
+                *s = c;
+                s++;
+
+                ofs++;
+                len -= 2;
+        }
+}
+
+/* local copy of ata_id_c_string() */
+static void mg_id_c_string(const u16 *id, unsigned char *s,
+                           unsigned int ofs, unsigned int len)
+{
+        unsigned char *p;
+
+        mg_id_string(id, s, ofs, len - 1);
+
+        p = s + strnlen(s, len - 1);
+        while (p > s && p[-1] == ' ')
+                p--;
+        *p = '\0';
+}
+
 static int mg_get_disk_id(struct mg_host *host)
 {
         u32 i;
@@ -403,9 +439,9 @@ static int mg_get_disk_id(struct mg_host *host)
                 host->n_sectors -= host->nres_sectors;
         }
 
-        ata_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
-        ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
-        ata_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
+        mg_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
+        mg_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
+        mg_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
         printk(KERN_INFO "mg_disk: model: %s\n", model);
         printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev);
         printk(KERN_INFO "mg_disk: serial: %s\n", serial);