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[RFC,v2,09/11] HID: hyperv: Make ringbuffer at least take two pages

Message ID 20200902030107.33380-10-boqun.feng@gmail.com
State New
Headers show
Series Hyper-V: Support PAGE_SIZE larger than 4K | expand

Commit Message

Boqun Feng Sept. 2, 2020, 3:01 a.m. UTC 
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 <boqun.feng@gmail.com>
---
 drivers/hid/hid-hyperv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/hid/hid-hyperv.c b/drivers/hid/hid-hyperv.c
index 0b6ee1dee625..dff032f17ad0 100644
--- a/drivers/hid/hid-hyperv.c
+++ b/drivers/hid/hid-hyperv.c
@@ -104,8 +104,8 @@  struct synthhid_input_report {
 
 #pragma pack(pop)
 
-#define INPUTVSC_SEND_RING_BUFFER_SIZE		(40 * 1024)
-#define INPUTVSC_RECV_RING_BUFFER_SIZE		(40 * 1024)
+#define INPUTVSC_SEND_RING_BUFFER_SIZE		max(40 * 1024, 2 * PAGE_SIZE)
+#define INPUTVSC_RECV_RING_BUFFER_SIZE		max(40 * 1024, 2 * PAGE_SIZE)
 
 
 enum pipe_prot_msg_type {