From: Saeed Mahameed saeedm@nvidia.com
[ Upstream commit 221384df6123747d2a75517dd06cc01752f81518 ]
ib_send_cm_sidr_rep() { spin_lock_irqsave() cm_send_sidr_rep_locked() { ... spin_lock_irq() .... spin_unlock_irq() <--- this will enable interrupts } spin_unlock_irqrestore() }
spin_unlock_irqrestore() expects interrupts to be disabled but the internal spin_unlock_irq() will always enable hard interrupts.
Fix this by replacing the internal spin_{lock,unlock}_irq() with irqsave/restore variants.
It fixes the following kernel trace:
raw_local_irq_restore() called with IRQs enabled WARNING: CPU: 2 PID: 20001 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x1d/0x20
Call Trace: _raw_spin_unlock_irqrestore+0x4e/0x50 ib_send_cm_sidr_rep+0x3a/0x50 [ib_cm] cma_send_sidr_rep+0xa1/0x160 [rdma_cm] rdma_accept+0x25e/0x350 [rdma_cm] ucma_accept+0x132/0x1cc [rdma_ucm] ucma_write+0xbf/0x140 [rdma_ucm] vfs_write+0xc1/0x340 ksys_write+0xb3/0xe0 do_syscall_64+0x2d/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xae
Fixes: 87c4c774cbef ("RDMA/cm: Protect access to remote_sidr_table") Link: https://lore.kernel.org/r/20210301081844.445823-1-leon@kernel.org Signed-off-by: Saeed Mahameed saeedm@nvidia.com Reviewed-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Leon Romanovsky leonro@nvidia.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/core/cm.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index 8e578f73a074..bbba0cd42c89 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -3650,6 +3650,7 @@ static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, struct ib_cm_sidr_rep_param *param) { struct ib_mad_send_buf *msg; + unsigned long flags; int ret;
lockdep_assert_held(&cm_id_priv->lock); @@ -3675,12 +3676,12 @@ static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, return ret; } cm_id_priv->id.state = IB_CM_IDLE; - spin_lock_irq(&cm.lock); + spin_lock_irqsave(&cm.lock, flags); if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); } - spin_unlock_irq(&cm.lock); + spin_unlock_irqrestore(&cm.lock, flags); return 0; }