Hi, On Monday, 16 January 2006 21:05, Pavel Machek wrote: > On Po 16-01-06 19:25:50, Matthew Garrett wrote: > > On Mon, Jan 16, 2006 at 08:20:36PM +0100, Pavel Machek wrote: > > > > > I had patch to fix this breakage, but it was rejected. What depends on > > > that code? > > > > Ubuntu's wireless disable script. > > Can you search linux-pm archives? Search for "3" (that's '"', '3', > '"'). It should be somewhere. I no longer have a copy. (Probably could > get it from my working tree git...) I think the appended message contains the latest version. Greetings, Rafael ---------- Forwarded Message ---------- Subject: Re: [linux-pm] [patch] pm: fix runtime powermanagement's /sys interface Date: Friday, 6 January 2006 00:08 From: Pavel Machek <pavel@xxxxxx> To: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>, Patrick Mochel <mochel@xxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxx>, Linux-pm mailing list <linux-pm@xxxxxxxxxxxxxx>, kernel list <linux-kernel@xxxxxxxxxxxxxxx> On ?t 05-01-06 23:27:05, Dominik Brodowski wrote: > On Thu, Jan 05, 2006 at 11:23:38PM +0100, Pavel Machek wrote: > > > In addition, your patch breaks pcmcia / pcmciautils which already uses > > > numbers (which I already had to change from "3" to "2" before...). > > > > pcmcia actually uses this? Ouch. Do you just read the power file, or > > do you write to it, too? > > Reading and writing. Replacement for "cardctl suspend" and "cardctl resume". > > > static int pccardctl_power_one(unsigned long socket_no, unsigned int device, > unsigned int power) > { > int ret; > char file[SYSFS_PATH_MAX]; > struct sysfs_attribute *attr; > > snprintf(file, SYSFS_PATH_MAX, > "/sys/bus/pcmcia/devices/%lu.%u/power/state", > socket_no, device); > > attr = sysfs_open_attribute(file); > if (!attr) > return -ENODEV; > > ret = sysfs_write_attribute(attr, power ? "2" : "0", 1); > > sysfs_close_attribute(attr); > > return (ret); > } > > > NB: it will break one day, one way or another, when gregkh makes the > /sys/class -> /sys/devices conversion. However, I'd want to try not to break > the new pcmciautils userspace too often... Ok, so lets at least add value-checking to .../power file, and prevent userspace see changes to PM_EVENT_SUSPEND value. 2 and 0 are now "arbitrary cookies". I'd like to use "on" and "off", but pcmcia apparently depends on "2" and "0", so... Any objections? Signed-off-by: Pavel Machek <pavel@xxxxxxx> Pavel diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c --- a/drivers/base/power/sysfs.c +++ b/drivers/base/power/sysfs.c @@ -27,22 +27,25 @@ static ssize_t state_show(struct device * dev, struct device_attribute *attr, char * buf) { - return sprintf(buf, "%u\n", dev->power.power_state.event); + if (dev->power.power_state.event) + return sprintf(buf, "2\n"); + else + return sprintf(buf, "0\n"); } static ssize_t state_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t n) { pm_message_t state; - char * rest; - int error = 0; + int error = -EINVAL; - state.event = simple_strtoul(buf, &rest, 10); - if (*rest) - return -EINVAL; - if (state.event) - error = dpm_runtime_suspend(dev, state); - else + state.event = PM_EVENT_SUSPEND; + if ((n == 1) && !strncmp(buf, "2", 1)) { dpm_runtime_resume(dev); + error = 0; + } + if ((n == 1) && !strncmp(buf, "0", 1)) + error = dpm_runtime_suspend(dev, state); + return error ? error : n; }