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| author | Pawel Moll <pawel.moll@arm.com> | 2014-04-24 17:19:30 +0100 |
|---|---|---|
| committer | Pawel Moll <pawel.moll@arm.com> | 2014-04-24 17:20:50 +0100 |
| commit | d08b80373cbb76c9b485b60d49fd3ba82abdf77c (patch) | |
| tree | 79e58dc5a01b1a87719b374d59730d85f52fc149 /drivers/power | |
| parent | bb6dd5757c12e9f3f25da971f1ea45c777ae79ab (diff) | |
| download | lwn-d08b80373cbb76c9b485b60d49fd3ba82abdf77c.tar.gz lwn-d08b80373cbb76c9b485b60d49fd3ba82abdf77c.zip | |
power/reset: vexpress: Fix restart/power off operation
The restart/power off implementation in the vexpress driver
used to obtain the config function when necessary. This was
wrong in two respects:
1. It required memory allocation with disabled interrupts
(it worked, but lockdep - when enabled - reported warnings).
2. Used jiffies-based timeout, while jiffies are not running
at this stage of system shutdown (therefore a config
transaction error - if happened - would have never be reported).
Fixed by pre-allocating the config function per device
and using mdelay for timeout.
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/reset/vexpress-poweroff.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/power/reset/vexpress-poweroff.c b/drivers/power/reset/vexpress-poweroff.c index 476aa495c110..b95cf71ed695 100644 --- a/drivers/power/reset/vexpress-poweroff.c +++ b/drivers/power/reset/vexpress-poweroff.c @@ -11,7 +11,7 @@ * Copyright (C) 2012 ARM Limited */ -#include <linux/jiffies.h> +#include <linux/delay.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> @@ -23,17 +23,12 @@ static void vexpress_reset_do(struct device *dev, const char *what) { int err = -ENOENT; - struct vexpress_config_func *func = - vexpress_config_func_get_by_dev(dev); + struct vexpress_config_func *func = dev_get_drvdata(dev); if (func) { - unsigned long timeout; - err = vexpress_config_write(func, 0, 0); - - timeout = jiffies + HZ; - while (time_before(jiffies, timeout)) - cpu_relax(); + if (!err) + mdelay(1000); } dev_emerg(dev, "Unable to %s (%d)\n", what, err); @@ -96,12 +91,18 @@ static int vexpress_reset_probe(struct platform_device *pdev) enum vexpress_reset_func func; const struct of_device_id *match = of_match_device(vexpress_reset_of_match, &pdev->dev); + struct vexpress_config_func *config_func; if (match) func = (enum vexpress_reset_func)match->data; else func = pdev->id_entry->driver_data; + config_func = vexpress_config_func_get_by_dev(&pdev->dev); + if (!config_func) + return -EINVAL; + dev_set_drvdata(&pdev->dev, config_func); + switch (func) { case FUNC_SHUTDOWN: vexpress_power_off_device = &pdev->dev; |