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kactive_blk_num (K) is only incremented on block close. In timer callback prb_retire_rx_blk_timer_expired, except delete_blk_timer is true, last_kactive_blk_num (L) is set to match kactive_blk_num (K) in all cases. L is also set to match K in prb_open_block. The only case K not equal to L is when scheduled by tpacket_rcv and K is just incremented on block close but no new block could be opened, so that it does not call prb_open_block in prb_dispatch_next_block. This patch modifies the prb_retire_rx_blk_timer_expired function by simply removing the check for L == K. This patch just provides another checkpoint to thaw the might-be-frozen block in any case. It doesn't have any effect because __packet_lookup_frame_in_block() has the same logic and does it again without this patch when detecting the ring is frozen. The patch only advances checking the status of the ring. Suggested-by: Willem de Bruijn <willemdebruijn.kernel@gmail.com> Reviewed-by: Willem de Bruijn <willemdebruijn.kernel@gmail.com> Reviewed-by: Jason Xing <kerneljasonxing@gmail.com> Link: https://lore.kernel.org/all/20250831100822.1238795-1-jackzxcui1989@163.com/ Signed-off-by: Xin Zhao <jackzxcui1989@163.com> Link: https://patch.msgid.link/20250908104549.204412-2-jackzxcui1989@163.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.