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8b8c8bca3a
Lockdep found the following potential deadlock between mcast_lock and
n_mcast_grps_lock: mcast_lock is taken from both interrupt context and
process context, so spin_lock_irqsave() must be used to take it.
n_mcast_grps_lock is only taken from process context, so at first it
seems safe to take it with plain spin_lock(); however, it also nests
inside mcast_lock, and hence we could deadlock:
cpu A cpu B
ipath_mcast_add():
spin_lock_irq(&mcast_lock);
ipath_mcast_detach():
spin_lock(&n_mcast_grps_lock);
<enter interrupt>
ipath_mcast_find():
spin_lock_irqsave(&mcast_lock);
spin_lock(&n_mcast_grps_lock);
Fix this by using spin_lock_irq() to take n_mcast_grps_lock.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
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|---|---|---|
| .. | ||
| ipath_common.h | ||
| ipath_cq.c | ||
| ipath_debug.h | ||
| ipath_diag.c | ||
| ipath_dma.c | ||
| ipath_driver.c | ||
| ipath_eeprom.c | ||
| ipath_file_ops.c | ||
| ipath_fs.c | ||
| ipath_iba6110.c | ||
| ipath_iba6120.c | ||
| ipath_init_chip.c | ||
| ipath_intr.c | ||
| ipath_kernel.h | ||
| ipath_keys.c | ||
| ipath_layer.c | ||
| ipath_layer.h | ||
| ipath_mad.c | ||
| ipath_mmap.c | ||
| ipath_mr.c | ||
| ipath_qp.c | ||
| ipath_rc.c | ||
| ipath_registers.h | ||
| ipath_ruc.c | ||
| ipath_srq.c | ||
| ipath_stats.c | ||
| ipath_sysfs.c | ||
| ipath_uc.c | ||
| ipath_ud.c | ||
| ipath_user_pages.c | ||
| ipath_verbs.c | ||
| ipath_verbs.h | ||
| ipath_verbs_mcast.c | ||
| ipath_wc_ppc64.c | ||
| ipath_wc_x86_64.c | ||
| Kconfig | ||
| Makefile | ||