[PATCH] ppc32: Fix might_sleep() warning with clock spreading
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2005-05-02 06:14:09
Hi ! 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> Index: linux-work/include/asm-ppc/pmac_feature.h ===================================================================
--- linux-work.orig/include/asm-ppc/pmac_feature.h 2005-05-02 10:49:57.000000000 +1000
+++ linux-work/include/asm-ppc/pmac_feature.h 2005-05-02 15:43:08.000000000 +1000@@ -316,6 +316,9 @@ 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
Index: linux-work/arch/ppc/platforms/pmac_feature.c ===================================================================
--- linux-work.orig/arch/ppc/platforms/pmac_feature.c 2005-05-02 13:16:22.000000000 +1000
+++ linux-work/arch/ppc/platforms/pmac_feature.c 2005-05-02 15:43:55.000000000 +1000@@ -1591,8 +1591,10 @@ } -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 @@ 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 @@ 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 @@ * 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 */
Index: linux-work/drivers/macintosh/via-pmu.c ===================================================================
--- linux-work.orig/drivers/macintosh/via-pmu.c 2005-05-02 10:48:11.000000000 +1000
+++ linux-work/drivers/macintosh/via-pmu.c 2005-05-02 15:45:49.000000000 +1000@@ -2351,6 +2351,10 @@ 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 @@ /* 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();