ARM: OMAP: use consistent error checking

Consistently check errors using the usual method used in the kernel
for much of its history.  For instance:

int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
{
	int div;
	div = gpmc_calc_divider(t->sync_clk);
	if (div < 0)
		return div;
static int gpmc_set_async_mode(int cs, struct gpmc_timings *t)
{
...
	return gpmc_cs_set_timings(cs, t);

.....
	ret = gpmc_set_async_mode(gpmc_onenand_data->cs, &t);
	if (IS_ERR_VALUE(ret))
		return ret;

So, gpmc_cs_set_timings() thinks any negative return value is an error,
but where we check that in higher levels, only a limited range are
errors...

There is only _one_ use of IS_ERR_VALUE() in arch/arm which is really
appropriate, and that is in arch/arm/include/asm/syscall.h:

static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
	unsigned long error = regs->ARM_r0;
	return IS_ERR_VALUE(error) ? error : 0;
}

because this function really does have to differentiate between error
return values and addresses which look like negative numbers (eg, from
mmap()).

So, here's a patch to remove them from OMAP, except for the above.
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-omap2/board-omap3beagle.c

@@ -457,7 +457,7 @@ static int __init beagle_opp_init(void)
 
 	/* Initialize the omap3 opp table if not already created. */
 	r = omap3_opp_init();
-	if (IS_ERR_VALUE(r) && (r != -EEXIST)) {
+	if (r < 0 && (r != -EEXIST)) {
 		pr_err("%s: opp default init failed\n", __func__);
 		return r;
 	}

arch/arm/mach-omap2/clock.c

@@ -596,7 +596,7 @@ int __init omap2_clk_switch_mpurate_at_boot(const char *mpurate_ck_name)
 		return -ENOENT;
 
 	r = clk_set_rate(mpurate_ck, mpurate);
-	if (IS_ERR_VALUE(r)) {
+	if (r < 0) {
 		WARN(1, "clock: %s: unable to set MPU rate to %d: %d\n",
 		     mpurate_ck_name, mpurate, r);
 		clk_put(mpurate_ck);

arch/arm/mach-omap2/gpmc-onenand.c

@@ -303,7 +303,7 @@ static int omap2_onenand_setup_async(void __iomem *onenand_base)
 	t = omap2_onenand_calc_async_timings();
 
 	ret = gpmc_set_async_mode(gpmc_onenand_data->cs, &t);
-	if (IS_ERR_VALUE(ret))
+	if (ret < 0)
 		return ret;
 
 	omap2_onenand_set_async_mode(onenand_base);
@@ -325,7 +325,7 @@ static int omap2_onenand_setup_sync(void __iomem *onenand_base, int *freq_ptr)
 	t = omap2_onenand_calc_sync_timings(gpmc_onenand_data, freq);
 
 	ret = gpmc_set_sync_mode(gpmc_onenand_data->cs, &t);
-	if (IS_ERR_VALUE(ret))
+	if (ret < 0)
 		return ret;
 
 	set_onenand_cfg(onenand_base);

arch/arm/mach-omap2/gpmc.c

@@ -709,7 +709,7 @@ static int gpmc_setup_irq(void)
 		return -EINVAL;
 
 	gpmc_irq_start = irq_alloc_descs(-1, 0, GPMC_NR_IRQ, 0);
-	if (IS_ERR_VALUE(gpmc_irq_start)) {
+	if (gpmc_irq_start < 0) {
 		pr_err("irq_alloc_descs failed\n");
 		return gpmc_irq_start;
 	}
@@ -797,7 +797,7 @@ static int gpmc_mem_init(void)
 			continue;
 		gpmc_cs_get_memconf(cs, &base, &size);
 		rc = gpmc_cs_insert_mem(cs, base, size);
-		if (IS_ERR_VALUE(rc)) {
+		if (rc < 0) {
 			while (--cs >= 0)
 				if (gpmc_cs_mem_enabled(cs))
 					gpmc_cs_delete_mem(cs);
@@ -1164,14 +1164,14 @@ static int gpmc_probe(struct platform_device *pdev)
 		 GPMC_REVISION_MINOR(l));
 
 	rc = gpmc_mem_init();
-	if (IS_ERR_VALUE(rc)) {
+	if (rc < 0) {
 		clk_disable_unprepare(gpmc_l3_clk);
 		clk_put(gpmc_l3_clk);
 		dev_err(gpmc_dev, "failed to reserve memory\n");
 		return rc;
 	}
 
-	if (IS_ERR_VALUE(gpmc_setup_irq()))
+	if (gpmc_setup_irq() < 0)
 		dev_warn(gpmc_dev, "gpmc_setup_irq failed\n");
 
 	return 0;

arch/arm/mach-omap2/omap_device.c

@@ -333,7 +333,7 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
 	int oh_cnt, i, ret = 0;
 
 	oh_cnt = of_property_count_strings(node, "ti,hwmods");
-	if (!oh_cnt || IS_ERR_VALUE(oh_cnt)) {
+	if (oh_cnt <= 0) {
 		dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
 		return -ENODEV;
 	}

arch/arm/mach-omap2/omap_hwmod.c

@@ -1661,7 +1661,7 @@ static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
 		return -ENOSYS;
 
 	ret = _lookup_hardreset(oh, name, &ohri);
-	if (IS_ERR_VALUE(ret))
+	if (ret < 0)
 		return ret;
 
 	if (oh->clkdm) {
@@ -2387,7 +2387,7 @@ static int __init _init(struct omap_hwmod *oh, void *data)
 	_init_mpu_rt_base(oh, NULL);
 
 	r = _init_clocks(oh, NULL);
-	if (IS_ERR_VALUE(r)) {
+	if (r < 0) {
 		WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
 		return -EINVAL;
 	}

arch/arm/mach-omap2/timer.c

@@ -288,7 +288,7 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
 			r = -EINVAL;
 		} else {
 			r = clk_set_parent(timer->fclk, src);
-			if (IS_ERR_VALUE(r))
+			if (r < 0)
 				pr_warn("%s: %s cannot set source\n",
 					__func__, oh->name);
 			clk_put(src);

arch/arm/plat-omap/dmtimer.c

@@ -505,7 +505,7 @@ int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 	}
 
 	ret = clk_set_parent(timer->fclk, parent);
-	if (IS_ERR_VALUE(ret))
+	if (ret < 0)
 		pr_err("%s: failed to set %s as parent\n", __func__,
 			parent_name);