From 10e840dfb0b7fc345082dd9e5fff3c1c02e7690e Mon Sep 17 00:00:00 2001 From: Alison Schofield Date: Thu, 19 Jan 2017 19:47:38 -0800 Subject: [PATCH] iio: trigger: free trigger resource correctly These stand-alone trigger drivers were using iio_trigger_put() where they should have been using iio_trigger_free(). The iio_trigger_put() adds a module_put which is bad since they never did a module_get. In the sysfs driver, module_get/put's are used as triggers are added & removed. This extra module_put() occurs on an error path in the probe routine (probably rare). In the bfin-timer & interrupt trigger drivers, the module resources are not explicitly managed, so it's doing a put on something that was never get'd. It occurs on the probe error path and on the remove path (not so rare). Tested with the sysfs trigger driver. The bfin & interrupt drivers were build tested & inspected only. Signed-off-by: Alison Schofield Signed-off-by: Jonathan Cameron --- drivers/iio/trigger/iio-trig-interrupt.c | 8 ++++---- drivers/iio/trigger/iio-trig-sysfs.c | 2 +- drivers/staging/iio/trigger/iio-trig-bfin-timer.c | 4 ++-- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/iio/trigger/iio-trig-interrupt.c b/drivers/iio/trigger/iio-trig-interrupt.c index 572bc6f02ca8..e18f12b74610 100644 --- a/drivers/iio/trigger/iio-trig-interrupt.c +++ b/drivers/iio/trigger/iio-trig-interrupt.c @@ -58,7 +58,7 @@ static int iio_interrupt_trigger_probe(struct platform_device *pdev) trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL); if (!trig_info) { ret = -ENOMEM; - goto error_put_trigger; + goto error_free_trigger; } iio_trigger_set_drvdata(trig, trig_info); trig_info->irq = irq; @@ -83,8 +83,8 @@ error_release_irq: free_irq(irq, trig); error_free_trig_info: kfree(trig_info); -error_put_trigger: - iio_trigger_put(trig); +error_free_trigger: + iio_trigger_free(trig); error_ret: return ret; } @@ -99,7 +99,7 @@ static int iio_interrupt_trigger_remove(struct platform_device *pdev) iio_trigger_unregister(trig); free_irq(trig_info->irq, trig); kfree(trig_info); - iio_trigger_put(trig); + iio_trigger_free(trig); return 0; } diff --git a/drivers/iio/trigger/iio-trig-sysfs.c b/drivers/iio/trigger/iio-trig-sysfs.c index 3dfab2bc6d69..202e8b89caf2 100644 --- a/drivers/iio/trigger/iio-trig-sysfs.c +++ b/drivers/iio/trigger/iio-trig-sysfs.c @@ -174,7 +174,7 @@ static int iio_sysfs_trigger_probe(int id) return 0; out2: - iio_trigger_put(t->trig); + iio_trigger_free(t->trig); free_t: kfree(t); out1: diff --git a/drivers/staging/iio/trigger/iio-trig-bfin-timer.c b/drivers/staging/iio/trigger/iio-trig-bfin-timer.c index 9658f2097c95..4e0b4eedb53d 100644 --- a/drivers/staging/iio/trigger/iio-trig-bfin-timer.c +++ b/drivers/staging/iio/trigger/iio-trig-bfin-timer.c @@ -260,7 +260,7 @@ out_free_irq: out1: iio_trigger_unregister(st->trig); out: - iio_trigger_put(st->trig); + iio_trigger_free(st->trig); return ret; } @@ -273,7 +273,7 @@ static int iio_bfin_tmr_trigger_remove(struct platform_device *pdev) peripheral_free(st->t->pin); free_irq(st->irq, st); iio_trigger_unregister(st->trig); - iio_trigger_put(st->trig); + iio_trigger_free(st->trig); return 0; }