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Subject[patch 17/32] USB: usbmon: Implement compat_ioctl
2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Pete Zaitcev <zaitcev@redhat.com>

commit 7abce6bedc118eb39fe177c2c26be5d008505c14 upstream.

Running a 32-bit usbmon(8) on 2.6.28-rc9 produces the following:
ioctl32(usbmon:28563): Unknown cmd fd(3) cmd(400c9206){t:ffffff92;sz:12} arg(ffd3f458) on /dev/usbmon0
It happens because the compatibility mode was implemented for 2.6.18
and not updated for the fsops.compat_ioctl API.

This patch relocates the pieces from under #ifdef CONFIG_COMPAT into
compat_ioctl with no other changes except one new whitespace.

Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/usb/mon/mon_bin.c | 105 ++++++++++++++++++++++++++++------------------
1 file changed, 66 insertions(+), 39 deletions(-)
--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -37,6 +37,7 @@
#define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get)
#define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch)
#define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8)
+
#ifdef CONFIG_COMPAT
#define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32)
#define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32)
@@ -921,21 +922,6 @@ static int mon_bin_ioctl(struct inode *i
}
break;

-#ifdef CONFIG_COMPAT
- case MON_IOCX_GET32: {
- struct mon_bin_get32 getb;
-
- if (copy_from_user(&getb, (void __user *)arg,
- sizeof(struct mon_bin_get32)))
- return -EFAULT;
-
- ret = mon_bin_get_event(file, rp,
- compat_ptr(getb.hdr32), compat_ptr(getb.data32),
- getb.alloc32);
- }
- break;
-#endif
-
case MON_IOCX_MFETCH:
{
struct mon_bin_mfetch mfetch;
@@ -962,7 +948,57 @@ static int mon_bin_ioctl(struct inode *i
}
break;

+ case MON_IOCG_STATS: {
+ struct mon_bin_stats __user *sp;
+ unsigned int nevents;
+ unsigned int ndropped;
+
+ spin_lock_irqsave(&rp->b_lock, flags);
+ ndropped = rp->cnt_lost;
+ rp->cnt_lost = 0;
+ spin_unlock_irqrestore(&rp->b_lock, flags);
+ nevents = mon_bin_queued(rp);
+
+ sp = (struct mon_bin_stats __user *)arg;
+ if (put_user(rp->cnt_lost, &sp->dropped))
+ return -EFAULT;
+ if (put_user(nevents, &sp->queued))
+ return -EFAULT;
+
+ }
+ break;
+
+ default:
+ return -ENOTTY;
+ }
+
+ return ret;
+}
+
#ifdef CONFIG_COMPAT
+static long mon_bin_compat_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct mon_reader_bin *rp = file->private_data;
+ int ret;
+
+ switch (cmd) {
+
+ case MON_IOCX_GET32: {
+ struct mon_bin_get32 getb;
+
+ if (copy_from_user(&getb, (void __user *)arg,
+ sizeof(struct mon_bin_get32)))
+ return -EFAULT;
+
+ ret = mon_bin_get_event(file, rp,
+ compat_ptr(getb.hdr32), compat_ptr(getb.data32),
+ getb.alloc32);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+
case MON_IOCX_MFETCH32:
{
struct mon_bin_mfetch32 mfetch;
@@ -986,37 +1022,25 @@ static int mon_bin_ioctl(struct inode *i
return ret;
if (put_user(ret, &uptr->nfetch32))
return -EFAULT;
- ret = 0;
}
- break;
-#endif
-
- case MON_IOCG_STATS: {
- struct mon_bin_stats __user *sp;
- unsigned int nevents;
- unsigned int ndropped;
-
- spin_lock_irqsave(&rp->b_lock, flags);
- ndropped = rp->cnt_lost;
- rp->cnt_lost = 0;
- spin_unlock_irqrestore(&rp->b_lock, flags);
- nevents = mon_bin_queued(rp);
+ return 0;

- sp = (struct mon_bin_stats __user *)arg;
- if (put_user(rp->cnt_lost, &sp->dropped))
- return -EFAULT;
- if (put_user(nevents, &sp->queued))
- return -EFAULT;
+ case MON_IOCG_STATS:
+ return mon_bin_ioctl(NULL, file, cmd,
+ (unsigned long) compat_ptr(arg));

- }
- break;
+ case MON_IOCQ_URB_LEN:
+ case MON_IOCQ_RING_SIZE:
+ case MON_IOCT_RING_SIZE:
+ case MON_IOCH_MFLUSH:
+ return mon_bin_ioctl(NULL, file, cmd, arg);

default:
- return -ENOTTY;
+ ;
}
-
- return ret;
+ return -ENOTTY;
}
+#endif /* CONFIG_COMPAT */

static unsigned int
mon_bin_poll(struct file *file, struct poll_table_struct *wait)
@@ -1094,6 +1118,9 @@ static const struct file_operations mon_
/* .write = mon_text_write, */
.poll = mon_bin_poll,
.ioctl = mon_bin_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = mon_bin_compat_ioctl,
+#endif
.release = mon_bin_release,
.mmap = mon_bin_mmap,
};


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