linux-kernel - [PATCH] e_powersaver: Add sanity checks to code provided by VIA

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Date:	Mon, 11 Jul 2011 23:08:26 +0100
From:	Rafał Bilski <rafalbilski@...eria.pl>
To:	Axel Lin <axel.lin@...il.com>
CC:	linux-kernel@...r.kernel.org, Dave Jones <davej@...hat.com>,
	cpufreq@...r.kernel.org
Subject: [PATCH] e_powersaver: Add sanity checks to code provided by VIA

Patch from VIA is forcing "e_powersaver" to accept any processor >=A, 
but code supports only A and D.
Patch from VIA is forcing "e_powersaver" to support new brand, but code 
was intended for 2 bits only.
Looks like model D is using 8 bits for brand. Compensate.

Thanks to Axel Lin for pointing it out!

Signed-off-by: Rafał Bilski <rafalbilski@...eria.pl>

---
  drivers/cpufreq/e_powersaver.c |   15 ++++++++++++---
  1 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/e_powersaver.c b/drivers/cpufreq/e_powersaver.c
index 35a257d..7883ffa 100644
--- a/drivers/cpufreq/e_powersaver.c
+++ b/drivers/cpufreq/e_powersaver.c
@@ -179,9 +179,13 @@ static int eps_cpu_init(struct cpufreq_policy *policy)
          break;
      case 13:
          rdmsr(0x1154, lo, hi);
-        brand = (((lo >> 4) ^ (lo >> 2))) & 0x000000ff;
+        brand = (((lo >> 4) ^ (lo >> 2))) & 0xff;
          printk(KERN_CONT "Model D ");
          break;
+    default:
+        printk(KERN_CONT "unknown processor\n");
+        return -ENODEV;
+        break;
      }

      switch (brand) {
@@ -194,14 +198,19 @@ static int eps_cpu_init(struct cpufreq_policy *policy)
      case EPS_BRAND_EDEN:
          printk(KERN_CONT "Eden\n");
          break;
+    case EPS_BRAND_C3:
+        printk(KERN_CONT "C3\n");
+        return -ENODEV;
+        break;
      case EPS_BRAND_C7D:
          printk(KERN_CONT "C7-D\n");
          break;
-    case EPS_BRAND_C3:
-        printk(KERN_CONT "C3\n");
+    default:
+        printk(KERN_CONT "unsupported brand\n");
          return -ENODEV;
          break;
      }
+
      /* Enable Enhanced PowerSaver */
      rdmsrl(MSR_IA32_MISC_ENABLE, val);
      if (!(val & MSR_IA32_MISC_ENABLE_ENHANCED_SPEEDSTEP)) {
-- 
1.7.6



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