Maximilian Heyne e94c6101e1 xen-blkback: Apply 'feature_persistent' parameter when connect ... In some use cases[1], the backend is created while the frontend doesn't support the persistent grants feature, but later the frontend can be changed to support the feature and reconnect. In the past, 'blkback' enabled the persistent grants feature since it unconditionally checked if frontend supports the persistent grants feature for every connect ('connect_ring()') and decided whether it should use persistent grans or not. However, commit aac8a70db2 ("xen-blkback: add a parameter for disabling of persistent grants") has mistakenly changed the behavior. It made the frontend feature support check to not be repeated once it shown the 'feature_persistent' as 'false', or the frontend doesn't support persistent grants. This commit changes the behavior of the parameter to make effect for every connect, so that the previous workflow can work again as expected. [1] https://lore.kernel.org/xen-devel/CAJwUmVB6H3iTs-C+U=v-pwJB7-_ZRHPxHzKRJZ22xEPW7z8a=g@mail.gmail.com/ Reported-by: Andrii Chepurnyi <andrii.chepurnyi82@gmail.com> Fixes: aac8a70db2 ("xen-blkback: add a parameter for disabling of persistent grants") Cc: <stable@vger.kernel.org> # 5.10.x Signed-off-by: Maximilian Heyne <mheyne@amazon.de> Signed-off-by: SeongJae Park <sj@kernel.org> Reviewed-by: Maximilian Heyne <mheyne@amazon.de> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20220715225108.193398-3-sj@kernel.org Signed-off-by: Juergen Gross <jgross@suse.com>		2022-08-12 12:13:51 +02:00
..
blkback.c	block: decouple REQ_OP_SECURE_ERASE from REQ_OP_DISCARD	2022-04-17 19:49:59 -06:00
common.h	xen-blkback: fix compatibility bug with single page rings	2021-04-23 09:34:07 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
xenbus.c	xen-blkback: Apply 'feature_persistent' parameter when connect	2022-08-12 12:13:51 +02:00