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iwlwifi: pcie: fix race in Rx buffer allocator

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[ Upstream commit 0f22e40053bd5378ad1e3250e65c574fd61c0cd6 ]

Make sure the rx_allocator worker is canceled before running the
rx_init routine.  rx_init frees and re-allocates all rxb's pages.  The
rx_allocator worker also allocates pages for the used rxb's.  Running
rx_init and rx_allocator simultaniously causes a kernel panic.  Fix
that by canceling the work in rx_init.

Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shaul Triebitz 2018-03-22 14:14:45 +02:00 committed by Greg Kroah-Hartman
parent d4fd1bf83f
commit 2e1bfab64c
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wireless/intel/iwlwifi/pcie/rx.c
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@ -898,6 +898,8 @@ int iwl_pcie_rx_init(struct iwl_trans *trans)
WQ_HIGHPRI | WQ_UNBOUND, 1);
INIT_WORK(&rba->rx_alloc, iwl_pcie_rx_allocator_work);
cancel_work_sync(&rba->rx_alloc);
spin_lock(&rba->lock);
atomic_set(&rba->req_pending, 0);
atomic_set(&rba->req_ready, 0);