HID: cp2112: fix sleep-while-atomic

A recent commit fixing DMA-buffers on stack added a shared transfer
buffer protected by a spinlock. This is broken as the USB HID request
callbacks can sleep. Fix this up by replacing the spinlock with a mutex.

Fixes: 1ffb3c40ffb5 ("HID: cp2112: make transfer buffers DMA capable")
Cc: stable <stable@vger.kernel.org>	# 4.9
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 2 insertions, 2 deletions

diff --git a/trafgen.c b/trafgen.c
index 5ec837b..b1950c4 100644
--- a/trafgen.c
+++ b/trafgen.c
@@ -157,7 +157,7 @@ static void timer_purge(void)
 	setitimer(ITIMER_REAL, &itimer, NULL); 
 }
 
-static void help(void)
+static void __noreturn help(void)
 {
 	printf("\ntrafgen %s, multithreaded zero-copy network packet generator\n", VERSION_STRING);
 	puts("http://www.netsniff-ng.org\n\n"
@@ -219,7 +219,7 @@ static void help(void)
 	die();
 }
 
-static void example(void)
+static void __noreturn example(void)
 {
 	const char *e =
 	"/* Note: dynamic elements make trafgen slower! */\n"