From: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Detect non-rotational devices and set the queue flag accordingly.
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
---
drivers/scsi/sd.c | 27 +++++++++++++++++++++++++++
1 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 86a8b12..ee61136 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -50,6 +50,7 @@
#include <linux/string_helpers.h>
#include <linux/async.h>
#include <asm/uaccess.h>
+#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
@@ -1800,6 +1801,29 @@ void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
}
/**
+ * sd_read_block_characteristics - Query block dev. characteristics
+ * @disk: disk to query
+ */
+static void sd_read_block_characteristics(struct scsi_disk *sdkp)
+{
+ char *buffer;
+ u16 rot;
+
+ /* Block Device Characteristics VPD */
+ buffer = scsi_get_vpd_page(sdkp->device, 0xb1);
+
+ if (buffer == NULL)
+ return;
+
+ rot = get_unaligned_be16(&buffer[4]);
+
+ if (rot == 1)
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
+
+ kfree(buffer);
+}
+
+/**
* sd_revalidate_disk - called the first time a new disk is seen,
* performs disk spin up, read_capacity, etc.
* @disk: struct gendisk we care about
@@ -1836,6 +1860,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
*/
if (sdkp->media_present) {
sd_read_capacity(sdkp, buffer);
+ sd_read_block_characteristics(sdkp);
sd_read_write_protect_flag(sdkp, buffer);
sd_read_cache_type(sdkp, buffer);
sd_read_app_tag_own(sdkp, buffer);
@@ -1976,6 +2001,8 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
add_disk(gd);
sd_dif_config_host(sdkp);
+ sd_revalidate_disk(gd);
+
sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
sdp->removable ? "removable " : "");
--
1.6.0.6
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