> -----Original Message----- > From: Greg KH [mailto:gregkh@xxxxxxxxxxxxxxxxxxx] > Sent: Thursday, April 9, 2015 17:07 > To: Dexuan Cui > Cc: linux-kernel@xxxxxxxxxxxxxxx; driverdev-devel@xxxxxxxxxxxxxxxxxxxxxx; > olaf@xxxxxxxxx; apw@xxxxxxxxxxxxx; jasowang@xxxxxxxxxx; KY Srinivasan; > vkuznets@xxxxxxxxxx; dan.carpenter@xxxxxxxxxx; Haiyang Zhang > Subject: Re: [PATCH] hv: vmbus_free_channels(): remove the redundant > free_channel() > > On Wed, Apr 08, 2015 at 11:13:47PM -0700, Dexuan Cui wrote: > > free_channel() has been invoked in > > vmbus_remove() -> hv_process_channel_removal(), or vmbus_remove() -> > > ... -> vmbus_close_internal() -> hv_process_channel_removal(). > > > > We also change to use list_for_each_entry_safe(), because the entry > > is removed in hv_process_channel_removal(). > > > > Thank Dan Carpenter for finding the issue! > > > > Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx> > > Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> > > Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > > Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> > > --- > > drivers/hv/channel_mgmt.c | 11 ++++++++--- > > 1 file changed, 8 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c > > index 0eeb1b3..865a3af 100644 > > --- a/drivers/hv/channel_mgmt.c > > +++ b/drivers/hv/channel_mgmt.c > > @@ -212,11 +212,16 @@ void hv_process_channel_removal(struct > vmbus_channel *channel, u32 relid) > > > > void vmbus_free_channels(void) > > { > > - struct vmbus_channel *channel; > > + struct vmbus_channel *channel, *tmp; > > + > > + list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, > > + listentry) { > > Horrid indentation, never put continuations on a 1 tab stop location, > you can't read this properly, right? > > > + /* if we don't set rescind to true, vmbus_close_internal() > > + * won't invoke hv_process_channel_removal(). > > + */ > > + channel->rescind = true; > > You are changing the logic here, right? Why do you now need the _safe() > call if you aren't freeing anything? > > confused, > > greg k-h Hi Greg, vmbus_device_unregister() invokes device_unregister() -> vmbus_remove() -> hv_process_channel_removal() -- in this function, we remove the entry from the list: list_del(&channel->listentry) and we run free_channel(channel). Thanks, -- Dexuan _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
