[SCSI] libiscsi: use is_power_of_2

Replacing n & (n - 1) for power of 2 check by is_power_of_2(n)

Signed-off-by: vignesh babu <vignesh.babu@wipro.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 6573223cb346a9fbdda2152eb3f4652e543a6dd8..553168ae44f1864c01a6f5cdc8508cc985fc7029 100644 (file)
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -24,6 +24,7 @@
 #include <linux/types.h>
 #include <linux/kfifo.h>
 #include <linux/delay.h>
+#include <linux/log2.h>
 #include <asm/unaligned.h>
 #include <net/tcp.h>
 #include <scsi/scsi_cmnd.h>
@@ -1700,7 +1701,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
                qdepth = ISCSI_DEF_CMD_PER_LUN;
        }
 
-       if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) ||
+       if (!is_power_of_2(cmds_max) ||
            cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
                if (cmds_max != 0)
                        printk(KERN_ERR "iscsi: invalid can_queue of %d. "