On Tue, Feb 19, 2013 at 02:06:26PM +0100, Borislav Petkov wrote: > On Tue, Feb 19, 2013 at 09:46:40AM -0300, Mauro Carvalho Chehab wrote: > > Ah, now I see what you're meaning. That would require to dynamically > > create a per-mci DEVICE_ATTR(). > > Dude, look at the code, we do that already. And you're using it with > dev_attr_sdram_scrub_rate. > > Simply change the permissions of the attribute before calling > device_create_file. > > pseudo: > > umode_t mode = 0; > > if (mci->set...) > mode |= S_IWUSR; > > if (mci->get...) > mode |= S_IRUGO; > > > dev_attr_sdram_scrub_rate.attr.mode = mode; > > device_create_file(&mci->dev, &dev_attr_sdram_scrub_rate); > > > No, on both cases, open() will return an error (-ENOENT against -EPERM). > > What if it is a shell script doing: > > cat /sys/devices/system/edac/mc/mc0/sdram_scrub_rate
what's the problem with that ? $ cat /path/to/file/that/doesnt/exist.txt cat: /path/to/file/that/doesnt/exist.txt: No such file or directory Didn't see any gates to hell opening here... -- balbi
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