struct list { struct list *next, *prev; }; static inline void list_init(struct list *list) { list->next = list; list->prev = list; } static inline int list_empty(struct list *list) { return list->next == list; } static inline void list_insert(struct list *link, struct list *new_link) { new_link->prev = link->prev; new_link->next = link; new_link->prev->next = new_link; new_link->next->prev = new_link; } static inline void list_append(struct list *list, struct list *new_link) { list_insert((struct list *)list, new_link); } static inline void list_prepend(struct list *list, struct list *new_link) { list_insert(list->next, new_link); } static inline void list_remove(struct list *link) { link->prev->next = link->next; link->next->prev = link->prev; } #define list_entry(link, type, member) \ ((type *)((char *)(link)-(unsigned long)(&((type *)0)->member))) #define list_head(list, type, member) \ list_entry((list)->next, type, member) #define list_tail(list, type, member) \ list_entry((list)->prev, type, member) #define list_next(elm, member) \ list_entry((elm)->member.next, typeof(*elm), member) #define list_for_each_entry(pos, list, member) \ for (pos = list_head(list, typeof(*pos), member); \ &pos->member != (list); \ pos = list_next(pos, member)) ump-back'>packet-rx-pump-back net-next plumbingsTobias Klauser
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /sound/usb/debug.h
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/usb/debug.h')