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RDMA/irdma: Fix KASAN issue with tasklet
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[ Upstream commit bd97cea ]

KASAN testing revealed the following issue assocated with freeing an IRQ.

[50006.466686] Call Trace:
[50006.466691]  <IRQ>
[50006.489538]  dump_stack+0x5c/0x80
[50006.493475]  print_address_description.constprop.6+0x1a/0x150
[50006.499872]  ? irdma_sc_process_ceq+0x483/0x790 [irdma]
[50006.505742]  ? irdma_sc_process_ceq+0x483/0x790 [irdma]
[50006.511644]  kasan_report.cold.11+0x7f/0x118
[50006.516572]  ? irdma_sc_process_ceq+0x483/0x790 [irdma]
[50006.522473]  irdma_sc_process_ceq+0x483/0x790 [irdma]
[50006.528232]  irdma_process_ceq+0xb2/0x400 [irdma]
[50006.533601]  ? irdma_hw_flush_wqes_callback+0x370/0x370 [irdma]
[50006.540298]  irdma_ceq_dpc+0x44/0x100 [irdma]
[50006.545306]  tasklet_action_common.isra.14+0x148/0x2c0
[50006.551096]  __do_softirq+0x1d0/0xaf8
[50006.555396]  irq_exit_rcu+0x219/0x260
[50006.559670]  irq_exit+0xa/0x20
[50006.563320]  smp_apic_timer_interrupt+0x1bf/0x690
[50006.568645]  apic_timer_interrupt+0xf/0x20
[50006.573341]  </IRQ>

The issue is that a tasklet could be pending on another core racing
the delete of the irq.

Fix by insuring any scheduled tasklet is killed after deleting the
irq.

Fixes: 44d9e52 ("RDMA/irdma: Implement device initialization definitions")
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Sindhu Devale <sindhu.devale@intel.com>
Link: https://lore.kernel.org/r/20240131233849.400285-2-sindhu.devale@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@mmarcini @gregkh
mmarcini authored and gregkh committed Mar 1, 2024
1 parent a8ef9c7 commit c6f1ca2
Showing 1 changed file with 7 additions and 0 deletions.
7 changes: 7 additions & 0 deletions drivers/infiniband/hw/irdma/hw.c
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Original file line number Diff line number Diff line change
Expand Up @@ -570,6 +570,13 @@ static void irdma_destroy_irq(struct irdma_pci_f *rf,
dev->irq_ops->irdma_dis_irq(dev, msix_vec->idx);
irq_update_affinity_hint(msix_vec->irq, NULL);
free_irq(msix_vec->irq, dev_id);
if (rf == dev_id) {
tasklet_kill(&rf->dpc_tasklet);
} else {
struct irdma_ceq *iwceq = (struct irdma_ceq *)dev_id;

tasklet_kill(&iwceq->dpc_tasklet);
}
}

/**
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