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a2113cc44d
linux_dsm_epyc7002/drivers
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Naftali Goldstein a2113cc44d iwlwifi: mvm: fix race in sync rx queue notification 
Consider the following flow:
 1. Driver starts to sync the rx queues due to a delba.
    mvm->queue_sync_cookie=1.
    This rx-queues-sync is synchronous, so it doesn't increment the
    cookie until all rx queues handle the notification from FW.
 2. During this time, driver starts to sync rx queues due to nssn sync
    required.
    The cookie's value is still 1, but it doesn't matter since this
    rx-queue-sync is non-synchronous so in the notification handler the
    cookie is ignored.
    What _does_ matter is that this flow increments the cookie to 2
    immediately.
    Remember though that the FW won't start servicing this command until
    it's done with the previous one.
 3. FW is still handling the first command, so it sends a notification
    with internal_notif->sync=1, and internal_notif->cookie=0, which
    triggers a WARN_ONCE.

The solution for this race is to only use the mvm->queue_sync_cookie in
case of a synchronous sync-rx-queues. This way in step 2 the cookie's
value won't change so we avoid the WARN.

The commit in the "fixes" field is the first commit to introduce
non-synchronous sending of this command to FW.

Fixes: 3c514bf831 ("iwlwifi: mvm: add a loose synchronization of the NSSN across Rx queues")
Signed-off-by: Naftali Goldstein <naftali.goldstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
2019-10-09 13:01:04 +03:00
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acpi Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2019-09-28 08:14:15 -07:00
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ata ata: libahci_platform: Add of_node_put() before loop exit 2019-09-19 12:21:44 -06:00
atm atm: he: clean up an indentation issue 2019-09-25 13:54:45 +02:00
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base mm,thp: stats for file backed THP 2019-09-24 15:54:11 -07:00
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isdn mISDN: enforce CAP_NET_RAW for raw sockets 2019-09-24 16:37:18 +02:00
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mailbox mailbox: qcom-apcs: fix max_register value 2019-09-17 00:54:29 -05:00
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memstick ms_block: fix spelling mistake "randomally" -> "randomly" 2019-09-11 16:11:01 +02:00
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mfd Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal 2019-09-29 10:24:23 -07:00
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mmc mmc: host: sdhci-pci: Add Genesys Logic GL975x support 2019-09-27 20:48:20 +02:00
mtd Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
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net iwlwifi: mvm: fix race in sync rx queue notification 2019-10-09 13:01:04 +03:00
nfc NFC: st95hf: clean up indentation issue 2019-09-27 20:31:18 +02:00
ntb NTB: fix IDT Kconfig typos/spellos 2019-09-23 17:20:40 -04:00
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power power supply and reset changes for the v5.4 series 2019-09-22 12:04:59 -07:00
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ptp ptp: correctly disable flags on old ioctls 2019-09-27 20:25:32 +02:00
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regulator LED updates for 5.4-rc1 2019-09-17 18:40:42 -07:00
remoteproc remoteproc updates for v5.4 2019-09-22 10:55:08 -07:00
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rpmsg rpmsg: glink-smem: Name the edge based on parent remoteproc 2019-09-17 15:33:31 -07:00
rtc RTC for 5.4 2019-09-22 11:05:43 -07:00
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