From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Mon, 2 May 2005 06:12:00 +0000 (+1000)
Subject: [PATCH] ppc32: Fix might_sleep() warning with clock spreading
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e521dca64e0f82d844928c5ee88d82fdced50cbe;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

[PATCH] ppc32: Fix might_sleep() warning with clock spreading

The clock spreading disable/enable code was called to late/early during
the suspend/resume code on some laptops and would trigger a
might_sleep() warning due to the down() call in the low level i2c code.

This fixes it by calling those functions earlier/later when interrupts
are still enabled.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/ppc/platforms/pmac_feature.c b/arch/ppc/platforms/pmac_feature.c
index f0bb3d39b68..867336ad5d3 100644
--- a/arch/ppc/platforms/pmac_feature.c
+++ b/arch/ppc/platforms/pmac_feature.c
@@ -1591,8 +1591,10 @@ intrepid_shutdown(struct macio_chip* macio, int sleep_mode)
 }
 
 
-static void __pmac pmac_tweak_clock_spreading(struct macio_chip* macio, int enable)
+void __pmac pmac_tweak_clock_spreading(int enable)
 {
+	struct macio_chip* macio = &macio_chips[0];
+
 	/* Hack for doing clock spreading on some machines PowerBooks and
 	 * iBooks. This implements the "platform-do-clockspreading" OF
 	 * property as decoded manually on various models. For safety, we also
@@ -1707,9 +1709,6 @@ core99_sleep(void)
 	    macio->type != macio_intrepid)
 		return -ENODEV;
 
-	/* Disable clock spreading */
-	pmac_tweak_clock_spreading(macio, 0);
-
 	/* We power off the wireless slot in case it was not done
 	 * by the driver. We don't power it on automatically however
 	 */
@@ -1852,9 +1851,6 @@ core99_wake_up(void)
 	UN_OUT(UNI_N_CLOCK_CNTL, save_unin_clock_ctl);
 	udelay(100);
 
-	/* Enable clock spreading */
-	pmac_tweak_clock_spreading(macio, 1);
-
 	return 0;
 }
 
@@ -2822,7 +2818,7 @@ set_initial_features(void)
 	 * clock spreading now. This should be a platform function but we
 	 * don't do these at the moment
 	 */
-	pmac_tweak_clock_spreading(&macio_chips[0], 1);
+	pmac_tweak_clock_spreading(1);
 
 #endif /* CONFIG_POWER4 */
 
diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index fdea1a3a631..e654aa5eecd 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -2351,6 +2351,10 @@ pmac_suspend_devices(void)
 		return -EBUSY;
 	}
 
+	/* Disable clock spreading on some machines */
+	pmac_tweak_clock_spreading(0);
+
+	/* Stop preemption */
 	preempt_disable();
 
 	/* Make sure the decrementer won't interrupt us */
@@ -2417,11 +2421,12 @@ pmac_wakeup_devices(void)
 
 	/* Re-enable local CPU interrupts */
 	local_irq_enable();
-
 	mdelay(100);
-
 	preempt_enable();
 
+	/* Re-enable clock spreading on some machines */
+	pmac_tweak_clock_spreading(1);
+
 	/* Resume devices */
 	device_resume();
 
diff --git a/include/asm-ppc/pmac_feature.h b/include/asm-ppc/pmac_feature.h
index 639b690ce6f..8beb162873f 100644
--- a/include/asm-ppc/pmac_feature.h
+++ b/include/asm-ppc/pmac_feature.h
@@ -316,6 +316,9 @@ extern void pmac_register_agp_pm(struct pci_dev *bridge,
 extern void pmac_suspend_agp_for_card(struct pci_dev *dev);
 extern void pmac_resume_agp_for_card(struct pci_dev *dev);
 
+/* Used by the via-pmu driver for suspend/resume
+ */
+extern void pmac_tweak_clock_spreading(int enable);
 
 /*
  * The part below is for use by macio_asic.c only, do not rely