On Tue, Aug 20, 2019 at 03:01:23AM +0000, Dexuan Cui wrote: > Simplify the ring buffer handling with the in-place API. > > Also avoid the dynamic allocation and the memory leak in the channel > callback function. > > Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx> > --- > > Hi Dmitry, can this patch go through Sasha's hyperv tree: > https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git > > This is a purely Hyper-V specific change. Sure, no problem. Acked-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> > > drivers/input/serio/hyperv-keyboard.c | 35 ++++++----------------------------- > 1 file changed, 6 insertions(+), 29 deletions(-) > > diff --git a/drivers/input/serio/hyperv-keyboard.c b/drivers/input/serio/hyperv-keyboard.c > index 88ae7c2..e486a8a 100644 > --- a/drivers/input/serio/hyperv-keyboard.c > +++ b/drivers/input/serio/hyperv-keyboard.c > @@ -237,40 +237,17 @@ static void hv_kbd_handle_received_packet(struct hv_device *hv_dev, > > static void hv_kbd_on_channel_callback(void *context) > { > + struct vmpacket_descriptor *desc; > struct hv_device *hv_dev = context; > - void *buffer; > - int bufferlen = 0x100; /* Start with sensible size */ > u32 bytes_recvd; > u64 req_id; > - int error; > > - buffer = kmalloc(bufferlen, GFP_ATOMIC); > - if (!buffer) > - return; > - > - while (1) { > - error = vmbus_recvpacket_raw(hv_dev->channel, buffer, bufferlen, > - &bytes_recvd, &req_id); > - switch (error) { > - case 0: > - if (bytes_recvd == 0) { > - kfree(buffer); > - return; > - } > - > - hv_kbd_handle_received_packet(hv_dev, buffer, > - bytes_recvd, req_id); > - break; > + foreach_vmbus_pkt(desc, hv_dev->channel) { > + bytes_recvd = desc->len8 * 8; > + req_id = desc->trans_id; > > - case -ENOBUFS: > - kfree(buffer); > - /* Handle large packet */ > - bufferlen = bytes_recvd; > - buffer = kmalloc(bytes_recvd, GFP_ATOMIC); > - if (!buffer) > - return; > - break; > - } > + hv_kbd_handle_received_packet(hv_dev, desc, bytes_recvd, > + req_id); > } > } > > -- > 1.8.3.1 > -- Dmitry
