> -----Original Message----- > From: James Bottomley [mailto:James.Bottomley@xxxxxxxxxxxxxxxxxxxxx] > Sent: Thursday, August 13, 2015 4:09 PM > To: KY Srinivasan <kys@xxxxxxxxxxxxx> > Cc: gregkh@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > devel@xxxxxxxxxxxxxxxxxxxxxx; ohering@xxxxxxxx; > jbottomley@xxxxxxxxxxxxx; hch@xxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx; > apw@xxxxxxxxxxxxx; vkuznets@xxxxxxxxxx; jasowang@xxxxxxxxxx; > Dexuan Cui <decui@xxxxxxxxxxxxx> > Subject: Re: [PATCH 1/1] Drivers: hv: vmbus: fix init_vp_index() for reloading > hv_netvsc > > On Thu, 2015-08-13 at 17:07 -0700, K. Y. Srinivasan wrote: > > From: Dexuan Cui <decui@xxxxxxxxxxxxx> > > > > This fixes the recent commit 3b71107d73b16074afa7658f3f0fcf837aabfe24: > > Which tree is this in? upstream linus is giving me bad object on that > id. Greg's char-misc tree. > > > > Drivers: hv: vmbus: Further improve CPU affiliation logic > > > > Without the fix, reloading hv_netvsc hangs the guest. > > The reason for looking for the commit id was to see if cc to stable was > necessary, is it? The offending patch was committed on August 5th and cc to stable was not necessary. K. Y > > James > > > Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx> > > Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > > --- > > drivers/hv/channel_mgmt.c | 17 +++++++++++++++++ > > 1 files changed, 17 insertions(+), 0 deletions(-) > > > > diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c > > index 3ab4753..8a4105c 100644 > > --- a/drivers/hv/channel_mgmt.c > > +++ b/drivers/hv/channel_mgmt.c > > @@ -204,6 +204,8 @@ void hv_process_channel_removal(struct > vmbus_channel *channel, u32 relid) > > spin_lock_irqsave(&vmbus_connection.channel_lock, flags); > > list_del(&channel->listentry); > > spin_unlock_irqrestore(&vmbus_connection.channel_lock, > flags); > > + > > + primary_channel = channel; > > } else { > > primary_channel = channel->primary_channel; > > spin_lock_irqsave(&primary_channel->lock, flags); > > @@ -211,6 +213,14 @@ void hv_process_channel_removal(struct > vmbus_channel *channel, u32 relid) > > primary_channel->num_sc--; > > spin_unlock_irqrestore(&primary_channel->lock, flags); > > } > > + > > + /* > > + * We need to free the bit for init_vp_index() to work in the case > > + * of sub-channel, when we reload drivers like hv_netvsc. > > + */ > > + cpumask_clear_cpu(channel->target_cpu, > > + &primary_channel->alloced_cpus_in_node); > > + > > free_channel(channel); > > } > > > > @@ -457,6 +467,13 @@ static void init_vp_index(struct vmbus_channel > *channel, const uuid_le *type_gui > > continue; > > } > > > > + /* > > + * NOTE: in the case of sub-channel, we clear the sub-channel > > + * related bit(s) in primary->alloced_cpus_in_node in > > + * hv_process_channel_removal(), so when we reload > drivers > > + * like hv_netvsc in SMP guest, here we're able to re-allocate > > + * bit from primary->alloced_cpus_in_node. > > + */ > > if (!cpumask_test_cpu(cur_cpu, > > &primary->alloced_cpus_in_node)) { > > cpumask_set_cpu(cur_cpu, > > ��.n��������+%������w��{.n�����{������ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
