PCI: is_power_of_2 in drivers/pci/pci.c

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: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 37c00f6..19a64a3 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
+#include <linux/log2.h>
 #include <asm/dma.h>   /* isa_dma_bridge_buggy */
 #include "pci.h"
 
@@ -1454,7 +1455,7 @@ int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc)
        int cap, err = -EINVAL;
        u32 stat, cmd, v, o;
 
-       if (mmrbc < 512 || mmrbc > 4096 || (mmrbc & (mmrbc-1)))
+       if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc))
                goto out;
 
        v = ffs(mmrbc) - 10;
@@ -1526,7 +1527,7 @@ int pcie_set_readrq(struct pci_dev *dev, int rq)
        int cap, err = -EINVAL;
        u16 ctl, v;
 
-       if (rq < 128 || rq > 4096 || (rq & (rq-1)))
+       if (rq < 128 || rq > 4096 || !is_power_of_2(rq))
                goto out;
 
        v = (ffs(rq) - 8) << 12;