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ab8500_fg.c: only request threaded IRQs when necessary 

All 5 IRQ handlers of the driver are requested as threaded interrupt
handlers.  However, only 1 handler can block.  The remaining 4 handlers
defer the actual handling to a workqueue.  Hence, 4 of 5 IRQ handlers
have a considerable overhead, since they are executed in a kernel thread
to schedule another kernel thread (workqueue).

This change splits up the 5 interrupt handlers into top halves (_th) and
bottom halves (_bh) and resolves the aforementioned overhead by only
requesting threaded interrupts (i.e., bottom halves) when necessary.

Signed-off-by: Valentin Rothberg <Valentin.Rothberg@lip6.fr>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Valentin Rothberg 2015-02-16 17:32:48 +01:00 committed by Sebastian Reichel
parent 5a5bf49088
commit 02232be7a2
1 changed files with 33 additions and 13 deletions
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46
drivers/power/ab8500_fg.c
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@ -3055,11 +3055,14 @@ static int ab8500_fg_remove(struct platform_device *pdev)
}
/* ab8500 fg driver interrupts and their respective isr */
static struct ab8500_fg_interrupts ab8500_fg_irq[] = {
static struct ab8500_fg_interrupts ab8500_fg_irq_th[] = {
{"NCONV_ACCU", ab8500_fg_cc_convend_handler},
{"BATT_OVV", ab8500_fg_batt_ovv_handler},
{"LOW_BAT_F", ab8500_fg_lowbatf_handler},
{"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
};
static struct ab8500_fg_interrupts ab8500_fg_irq_bh[] = {
{"CCEOC", ab8500_fg_cc_data_end_handler},
};
@ -3187,21 +3190,36 @@ static int ab8500_fg_probe(struct platform_device *pdev)
init_completion(&di->ab8500_fg_started);
init_completion(&di->ab8500_fg_complete);
/* Register interrupts */
for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) {
irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
ret = request_threaded_irq(irq, NULL, ab8500_fg_irq[i].isr,
IRQF_SHARED | IRQF_NO_SUSPEND,
ab8500_fg_irq[i].name, di);
/* Register primary interrupt handlers */
for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq_th); i++) {
irq = platform_get_irq_byname(pdev, ab8500_fg_irq_th[i].name);
ret = request_irq(irq, ab8500_fg_irq_th[i].isr,
IRQF_SHARED | IRQF_NO_SUSPEND,
ab8500_fg_irq_th[i].name, di);
if (ret != 0) {
dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
, ab8500_fg_irq[i].name, irq, ret);
dev_err(di->dev, "failed to request %s IRQ %d: %d\n",
ab8500_fg_irq_th[i].name, irq, ret);
goto free_irq;
}
dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
ab8500_fg_irq[i].name, irq, ret);
ab8500_fg_irq_th[i].name, irq, ret);
}
/* Register threaded interrupt handler */
irq = platform_get_irq_byname(pdev, ab8500_fg_irq_bh[0].name);
ret = request_threaded_irq(irq, NULL, ab8500_fg_irq_bh[0].isr,
IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
ab8500_fg_irq_bh[0].name, di);
if (ret != 0) {
dev_err(di->dev, "failed to request %s IRQ %d: %d\n",
ab8500_fg_irq_bh[0].name, irq, ret);
goto free_irq;
}
dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
ab8500_fg_irq_bh[0].name, irq, ret);
di->irq = platform_get_irq_byname(pdev, "CCEOC");
disable_irq(di->irq);
di->nbr_cceoc_irq_cnt = 0;
@ -3238,11 +3256,13 @@ static int ab8500_fg_probe(struct platform_device *pdev)
free_irq:
power_supply_unregister(&di->fg_psy);
/* We also have to free all successfully registered irqs */
for (i = i - 1; i >= 0; i--) {
irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
/* We also have to free all registered irqs */
for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq_th); i++) {
irq = platform_get_irq_byname(pdev, ab8500_fg_irq_th[i].name);
free_irq(irq, di);
}
irq = platform_get_irq_byname(pdev, ab8500_fg_irq_bh[0].name);
free_irq(irq, di);
free_inst_curr_wq:
destroy_workqueue(di->fg_wq);
return ret;