commit ab1068d6866e28bf6427ceaea681a381e5870a4a
Author: Hao Wei Tee <[email protected]>
Date: Tue May 29 10:25:17 2018 +0300
iwlwifi: pcie: compare with number of IRQs requested for, not number of CPUs
When there are 16 or more logical CPUs, we request for
`IWL_MAX_RX_HW_QUEUES` (16) IRQs only as we limit to that number of
IRQs, but later on we compare the number of IRQs returned to
nr_online_cpus+2 instead of max_irqs, the latter being what we
actually asked for. This ends up setting num_rx_queues to 17 which
causes lots of out-of-bounds array accesses later on.
Compare to max_irqs instead, and also add an assertion in case
num_rx_queues > IWM_MAX_RX_HW_QUEUES.
This fixes https://bugzilla.kernel.org/show_bug.cgi?id=199551
Fixes: 2e5d4a8f61dc ("iwlwifi: pcie: Add new configuration to enable MSIX")
Signed-off-by: Hao Wei Tee <[email protected]>
Tested-by: Sara Sharon <[email protected]>
Signed-off-by: Luca Coelho <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
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https://bugs.launchpad.net/bugs/1805088
Title:
iwlwifi fails to work on 16 or more logical CPUs machines
Status in linux package in Ubuntu:
In Progress
Bug description:
[Impact]
Got dmesg kernel BUG while loading iwlwifi driver on machines which has 16 or
more logical CPUs
kernel: RIP: 0010:iwl_pcie_rxq_alloc_rbs+0x1d0/0x1f0 [iwlwifi]
And it leads to wifi can't scan any APs, and leads to system hangs while
suspending.
[Fix]
Below commit contained in v4.17 fix the issue.
ab1068d6866e iwlwifi: pcie: compare with number of IRQs requested for, not
number of CPUs
[Regression Potential]
Low.
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