[RFC 08/11] Input: hyperv-keyboard: Make ringbuffer at least take two pages
From: Boqun Feng <hidden>
Date: 2020-07-21 01:42:35
Also in:
linux-input, linux-scsi, lkml, netdev
Subsystem:
hyper-v/azure core and drivers, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
"K. Y. Srinivasan", Haiyang Zhang, Wei Liu, Dexuan Cui, Long Li, Dmitry Torokhov, Linus Torvalds
When PAGE_SIZE > HV_HYP_PAGE_SIZE, we need the ringbuffer size to be at least 2 * PAGE_SIZE: one page for the header and at least one page of the data part (because of the alignment requirement for double mapping). So make sure the ringbuffer sizes to be at least 2 * PAGE_SIZE when using vmbus_open() to establish the vmbus connection. Signed-off-by: Boqun Feng <redacted> --- drivers/input/serio/hyperv-keyboard.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/input/serio/hyperv-keyboard.c b/drivers/input/serio/hyperv-keyboard.c
index df4e9f6f4529..77ba57ba2691 100644
--- a/drivers/input/serio/hyperv-keyboard.c
+++ b/drivers/input/serio/hyperv-keyboard.c@@ -75,8 +75,8 @@ struct synth_kbd_keystroke { #define HK_MAXIMUM_MESSAGE_SIZE 256 -#define KBD_VSC_SEND_RING_BUFFER_SIZE (40 * 1024) -#define KBD_VSC_RECV_RING_BUFFER_SIZE (40 * 1024) +#define KBD_VSC_SEND_RING_BUFFER_SIZE max(40 * 1024, 2 * PAGE_SIZE) +#define KBD_VSC_RECV_RING_BUFFER_SIZE max(40 * 1024, 2 * PAGE_SIZE) #define XTKBD_EMUL0 0xe0 #define XTKBD_EMUL1 0xe1
--
2.27.0