From: Paul Walmsley <paul@pwsan.com>
Date: Wed, 28 Jan 2009 19:35:31 +0000 (-0700)
Subject: [ARM] OMAP2/3 clock: don't tinker with hardirqs when they are supposed to be disabled
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=883992bd8f6924c9aa849f2dac381075e2e55a9d;hp=8263e5b31eae2bbf689ff08a7da334329c9f353b;p=linux-2.6-omap-h63xx.git

[ARM] OMAP2/3 clock: don't tinker with hardirqs when they are supposed to be disabled

Clock rate change code executes inside a spinlock with hardirqs
disabled.  The only code that should be messing around with the
hardirq state should be the plat-omap/clock.c code.  In the
omap2_reprogram_dpllcore() case, this probably just wastes cycles, but
in the omap3_core_dpll_m2_set_rate() case, this is a nasty bug.

linux-omap source commit is b9b6208dadb5e0d8b290900a3ffa911673ca97ed.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/mach-omap2/clock24xx.c b/arch/arm/mach-omap2/clock24xx.c
index 1a885976c25..069f3e1827a 100644
--- a/arch/arm/mach-omap2/clock24xx.c
+++ b/arch/arm/mach-omap2/clock24xx.c
@@ -380,10 +380,7 @@ static int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate)
 	u32 bypass = 0;
 	struct prcm_config tmpset;
 	const struct dpll_data *dd;
-	unsigned long flags;
-	int ret = -EINVAL;
 
-	local_irq_save(flags);
 	cur_rate = omap2_get_dpll_rate_24xx(&dpll_ck);
 	mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
 	mult &= OMAP24XX_CORE_CLK_SRC_MASK;
@@ -395,7 +392,7 @@ static int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate)
 	} else if (rate != cur_rate) {
 		valid_rate = omap2_dpllcore_round_rate(rate);
 		if (valid_rate != rate)
-			goto dpll_exit;
+			return -EINVAL;
 
 		if (mult == 1)
 			low = curr_prcm_set->dpll_speed;
@@ -404,7 +401,7 @@ static int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate)
 
 		dd = clk->dpll_data;
 		if (!dd)
-			goto dpll_exit;
+			return -EINVAL;
 
 		tmpset.cm_clksel1_pll = __raw_readl(dd->mult_div1_reg);
 		tmpset.cm_clksel1_pll &= ~(dd->mult_mask |
@@ -441,11 +438,8 @@ static int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate)
 		omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
 		omap2xxx_sdrc_reprogram(done_rate, 0);
 	}
-	ret = 0;
 
-dpll_exit:
-	local_irq_restore(flags);
-	return(ret);
+	return 0;
 }
 
 /**
diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index a853b1e149e..3b6e27bc9fe 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -686,10 +686,8 @@ static int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate)
 	WARN_ON(new_div != 1 && new_div != 2);
 
 	/* REVISIT: Add SDRC_MR changing to this code also */
-	local_irq_disable();
 	omap3_configure_core_dpll(sp->rfr_ctrl, sp->actim_ctrla,
 				  sp->actim_ctrlb, new_div);
-	local_irq_enable();
 
 	return 0;
 }