[PATCH] usb: check for signals in chaoskey read function

[Keith Packard]

Call signal_pending before reading a chunk of data from the device so
that long read operations can be interrupted with a signal.

Signed-off-by: Keith Packard <kei...@keithp.com>
---
 drivers/usb/misc/chaoskey.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/misc/chaoskey.c b/drivers/usb/misc/chaoskey.c
index 23c7948..ab87db2 100644
--- a/drivers/usb/misc/chaoskey.c
+++ b/drivers/usb/misc/chaoskey.c
@@ -394,6 +394,13 @@ static ssize_t chaoskey_read(struct file *file,
                if (result)
                        goto bail;
                if (dev->valid == dev->used) {
+
+                       if (signal_pending(current)) {
+                               result = -ERESTARTSYS;
+                               mutex_unlock(&dev->lock);
+                               goto bail;
+                       }
+
                        result = _chaoskey_fill(dev);
                        if (result) {
                                mutex_unlock(&dev->lock);
-- 
2.7.0