diff options
| author | Phil Endecott <phil_twuce_endecott@chezphil.org> | 2008-11-12 18:37:00 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-01-07 20:59:51 +0300 |
| commit | ff8973d9468ea07e61ef492dd8c806a6e1a76ac1 (patch) | |
| tree | b33e0b8d4390eec5c2bf171556b42249c209e8be /drivers/usb/core | |
| parent | d767d888750a8e15656b7ee15d68f90a151b8936 (diff) | |
| download | linux-ff8973d9468ea07e61ef492dd8c806a6e1a76ac1.tar.xz | |
USB: Remove restrictions on signal numbers in devio.c
Just over a year ago (!) I had this brief exchange with Alan Stern:
>> It seems that the signal that can be used with USBDEVFS_DISCSIGNAL and
>> in usbdevfs_urb.signr is limited to the real-time signals SIGRTMIN to
>> SIGRTMAX. What's the rationale for this restriction? I believe that a
>> process can kill() itself with any signal number, can't it? I was
>> planning to use SIGIO for usbdevfs_urb.signr and SIGTERM (uncaught) for
>> USBDEVFS_DISCSIGNAL. I don't think I'll have a problem with using
>> SIGRTMIN+n instead, but I'm curious to know if there's some subtle
>> problem with the non-real-time signals that I should be aware of.
>
> I don't know of any reason for this restriction.
Since no-one else could think of a reason either, I offer the following
patch which allows any signal to be used with USBDEVFS_DISCSIGNAL and
usbdevfs_urb.signr.
Signed-off-by: Phil Endecott <usbpatch@chezphil.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/devio.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index aa79280df15d..c85e29381a88 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -981,9 +981,6 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, return -EINVAL; if (!uurb->buffer) return -EINVAL; - if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || - uurb->signr > SIGRTMAX)) - return -EINVAL; if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { ifnum = findintfep(ps->dev, uurb->endpoint); @@ -1401,8 +1398,6 @@ static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) if (copy_from_user(&ds, arg, sizeof(ds))) return -EFAULT; - if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX)) - return -EINVAL; ps->discsignr = ds.signr; ps->disccontext = ds.context; return 0; |