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authorValentin Rothberg <Valentin.Rothberg@lip6.fr>2015-02-16 17:32:48 +0100
committerSebastian Reichel <sre@kernel.org>2015-03-07 20:32:22 +0100
commit02232be7a2bf6e2dd5e4a6c3a81470a09ecc7fdd (patch)
treeed27aec75fa383838a7451eea1a57fa3e3c7ff7f /drivers/power
parent5a5bf49088f4c92f36786a2e4c20e17f715f0827 (diff)
downloadlinux-02232be7a2bf6e2dd5e4a6c3a81470a09ecc7fdd.tar.bz2
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>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/ab8500_fg.c46
1 files changed, 33 insertions, 13 deletions
diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
index 40344e01df80..d30387bc4c21 100644
--- a/drivers/power/ab8500_fg.c
+++ b/drivers/power/ab8500_fg.c
@@ -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;