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Filename Latest commit message Latest commit date
Sukadev Bhattiprolu 26ffb89160 powerpc/vnic: Extend "failover pending" window 
[ Upstream commit 1d8504937478fdc2f3ef2174a816fd3302eca882 ]

Commit 5a18e1e0c1 introduced the 'failover_pending' state to track
the "failover pending window" - where we wait for the partner to become
ready (after a transport event) before actually attempting to failover.
i.e window is between following two events:

        a. we get a transport event due to a FAILOVER

        b. later, we get CRQ_INITIALIZED indicating the partner is
           ready  at which point we schedule a FAILOVER reset.

and ->failover_pending is true during this window.

If during this window, we attempt to open (or close) a device, we pretend
that the operation succeded and let the FAILOVER reset path complete the
operation.

This is fine, except if the transport event ("a" above) occurs during the
open and after open has already checked whether a failover is pending. If
that happens, we fail the open, which can cause the boot scripts to leave
the interface down requiring administrator to manually bring up the device.

This fix "extends" the failover pending window till we are _actually_
ready to perform the failover reset (i.e until after we get the RTNL
lock). Since open() holds the RTNL lock, we can be sure that we either
finish the open or if the open() fails due to the failover pending window,
we can again pretend that open is done and let the failover complete it.

We could try and block the open until failover is completed but a) that
could still timeout the application and b) Existing code "pretends" that
failover occurred "just after" open succeeded, so marks the open successful
and lets the failover complete the open. So, mark the open successful even
if the transport event occurs before we actually start the open.

Fixes: 5a18e1e0c1 ("ibmvnic: Fix failover case for non-redundant configuration")
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Acked-by: Dany Madden <drt@linux.ibm.com>
Link: https://lore.kernel.org/r/20201030170711.1562994-1-sukadev@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-10 12:37:25 +01:00
arch arm64: Change .weak to SYM_FUNC_START_WEAK_PI for arch/arm64/lib/mem*.S 2020-11-10 12:37:24 +01:00
block block: ratelimit handle_bad_sector() message 2020-10-29 09:58:01 +01:00
certs
crypto crypto: algif_skcipher - EBUSY on aio should be an error 2020-10-29 09:57:30 +01:00
Documentation linkage: Introduce new macros for assembler symbols 2020-11-10 12:37:24 +01:00
drivers powerpc/vnic: Extend "failover pending" window 2020-11-10 12:37:25 +01:00
fs cachefiles: Handle readpage error correctly 2020-11-05 11:43:36 +01:00
include linkage: Introduce new macros for assembler symbols 2020-11-10 12:37:24 +01:00
init printk: reduce LOG_BUF_SHIFT range for H8300 2020-11-05 11:43:16 +01:00
ipc
kernel ptrace: fix task_join_group_stop() for the case when current is traced 2020-11-10 12:37:24 +01:00
lib sgl_alloc_order: fix memory leak 2020-11-05 11:43:22 +01:00
LICENSES
mm mm/page_owner: change split_page_owner to take a count 2020-10-29 09:57:52 +01:00
net ip_tunnel: fix over-mtu packet send fail without TUNNEL_DONT_FRAGMENT flags 2020-11-10 12:37:25 +01:00
samples samples/bpf: Fix possible deadlock in xdpsock 2020-11-05 11:43:17 +01:00
scripts scripts/setlocalversion: make git describe output more reliable 2020-11-01 12:01:01 +01:00
security evm: Check size of security.evm before using it 2020-11-01 12:01:05 +01:00
sound ASoC: Intel: Skylake: Add alternative topology binary name 2020-11-10 12:37:23 +01:00
tools perf python scripting: Fix printable strings in python3 scripts 2020-11-05 11:43:32 +01:00
usr
virt KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch 2020-10-01 13:18:25 +02:00
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Makefile Linux 5.4.75 2020-11-05 11:43:38 +01:00
README

README 

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 Restructured Text 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.