lkml.org 
[lkml]   [2015]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
SubjectRe: [PATCH 3/3] hv: vmbus_open(): reset the channel state on ENOMEM
Date
Dexuan Cui <decui@microsoft.com> writes:

> Without this patch, the state is put to CHANNEL_OPENING_STATE, and when
> the driver is loaded next time, vmbus_open() will fail immediately due to
> newchannel->state != CHANNEL_OPEN_STATE.

The patch makes sense, but I have one small doubt. We call vmbus_open
from probe functions of various devices. E.g. in hyperv-keyboard we
have:
error = vmbus_open(...)
if (error)
goto err_free_mem;

and we don't call vmbus_close(...) on this path so no
CHANNELMSG_CLOSECHANNEL will be send. Who's gonna retry probe? Wouldn't
it be better to close the channel?

>
> CC: "K. Y. Srinivasan" <kys@microsoft.com>
> Signed-off-by: Dexuan Cui <decui@microsoft.com>
> ---
> drivers/hv/channel.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
> index 2978f5e..26dcf26 100644
> --- a/drivers/hv/channel.c
> +++ b/drivers/hv/channel.c
> @@ -89,9 +89,10 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
> out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
> get_order(send_ringbuffer_size + recv_ringbuffer_size));
>
> - if (!out)
> - return -ENOMEM;
> -
> + if (!out) {
> + err = -ENOMEM;
> + goto error0;
> + }
>
> in = (void *)((unsigned long)out + send_ringbuffer_size);
>
> @@ -199,6 +200,7 @@ error0:
> free_pages((unsigned long)out,
> get_order(send_ringbuffer_size + recv_ringbuffer_size));
> kfree(open_info);
> + newchannel->state = CHANNEL_OPEN_STATE;
> return err;
> }
> EXPORT_SYMBOL_GPL(vmbus_open);

--
Vitaly


\
 
 \ /
  Last update: 2015-01-29 14:41    [W:0.071 / U:0.412 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site