staging: atomisp: use local variable to reduce number of references

Define new local variable to reduce the number of reference.
The new local variable is added to save the addess of dfs
and used in atomisp_freq_scaling() function.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c b/drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c
index 94bc7938f533c63e521c7d4fd623557825ae6449..9ad5146931635b02251fd8b237b6b979403f57e8 100644 (file)
--- a/drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c
+++ b/drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c
@@ -251,6 +251,7 @@ int atomisp_freq_scaling(struct atomisp_device *isp,
 {
        /* FIXME! Only use subdev[0] status yet */
        struct atomisp_sub_device *asd = &isp->asd[0];
+       const struct atomisp_dfs_config *dfs;
        unsigned int new_freq;
        struct atomisp_freq_scaling_rule curr_rules;
        int i, ret;
@@ -265,20 +266,22 @@ int atomisp_freq_scaling(struct atomisp_device *isp,
                ATOMISP_PCI_DEVICE_SOC_CHT && ATOMISP_USE_YUVPP(asd))
                isp->dfs = &dfs_config_cht_soc;
 
-       if (isp->dfs->lowest_freq == 0 || isp->dfs->max_freq_at_vmin == 0 ||
-           isp->dfs->highest_freq == 0 || isp->dfs->dfs_table_size == 0 ||
-           !isp->dfs->dfs_table) {
+       dfs = isp->dfs;
+
+       if (dfs->lowest_freq == 0 || dfs->max_freq_at_vmin == 0 ||
+           dfs->highest_freq == 0 || dfs->dfs_table_size == 0 ||
+           !dfs->dfs_table) {
                dev_err(isp->dev, "DFS configuration is invalid.\n");
                return -EINVAL;
        }
 
        if (mode == ATOMISP_DFS_MODE_LOW) {
-               new_freq = isp->dfs->lowest_freq;
+               new_freq = dfs->lowest_freq;
                goto done;
        }
 
        if (mode == ATOMISP_DFS_MODE_MAX) {
-               new_freq = isp->dfs->highest_freq;
+               new_freq = dfs->highest_freq;
                goto done;
        }
 
@@ -304,26 +307,26 @@ int atomisp_freq_scaling(struct atomisp_device *isp,
        }
 
        /* search for the target frequency by looping freq rules*/
-       for (i = 0; i < isp->dfs->dfs_table_size; i++) {
-               if (curr_rules.width != isp->dfs->dfs_table[i].width &&
-                   isp->dfs->dfs_table[i].width != ISP_FREQ_RULE_ANY)
+       for (i = 0; i < dfs->dfs_table_size; i++) {
+               if (curr_rules.width != dfs->dfs_table[i].width &&
+                   dfs->dfs_table[i].width != ISP_FREQ_RULE_ANY)
                        continue;
-               if (curr_rules.height != isp->dfs->dfs_table[i].height &&
-                   isp->dfs->dfs_table[i].height != ISP_FREQ_RULE_ANY)
+               if (curr_rules.height != dfs->dfs_table[i].height &&
+                   dfs->dfs_table[i].height != ISP_FREQ_RULE_ANY)
                        continue;
-               if (curr_rules.fps != isp->dfs->dfs_table[i].fps &&
-                   isp->dfs->dfs_table[i].fps != ISP_FREQ_RULE_ANY)
+               if (curr_rules.fps != dfs->dfs_table[i].fps &&
+                   dfs->dfs_table[i].fps != ISP_FREQ_RULE_ANY)
                        continue;
-               if (curr_rules.run_mode != isp->dfs->dfs_table[i].run_mode &&
-                   isp->dfs->dfs_table[i].run_mode != ISP_FREQ_RULE_ANY)
+               if (curr_rules.run_mode != dfs->dfs_table[i].run_mode &&
+                   dfs->dfs_table[i].run_mode != ISP_FREQ_RULE_ANY)
                        continue;
                break;
        }
 
-       if (i == isp->dfs->dfs_table_size)
-               new_freq = isp->dfs->max_freq_at_vmin;
+       if (i == dfs->dfs_table_size)
+               new_freq = dfs->max_freq_at_vmin;
        else
-               new_freq = isp->dfs->dfs_table[i].isp_freq;
+               new_freq = dfs->dfs_table[i].isp_freq;
 
 done:
        dev_dbg(isp->dev, "DFS target frequency=%d.\n", new_freq);