Merge branch 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

[cascardo/linux.git] / drivers / scsi / scsi_transport_spi.c

diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index cf08071..fa2aece 100644 (file)
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -32,6 +32,7 @@
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_eh.h>
+#include <scsi/scsi_tcq.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_spi.h>
 
@@ -1207,6 +1208,28 @@ int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
 }
 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
 
+/**
+ * spi_populate_tag_msg - place a tag message in a buffer
+ * @msg:       pointer to the area to place the tag
+ * @cmd:       pointer to the scsi command for the tag
+ *
+ * Notes:
+ *     designed to create the correct type of tag message for the 
+ *     particular request.  Returns the size of the tag message.
+ *     May return 0 if TCQ is disabled for this device.
+ **/
+int spi_populate_tag_msg(unsigned char *msg, struct scsi_cmnd *cmd)
+{
+        if (cmd->flags & SCMD_TAGGED) {
+               *msg++ = MSG_SIMPLE_TAG;
+               *msg++ = cmd->request->tag;
+               return 2;
+       }
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(spi_populate_tag_msg);
+
 #ifdef CONFIG_SCSI_CONSTANTS
 static const char * const one_byte_msgs[] = {
 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",