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| author | Justin Tee <justin.tee@broadcom.com> | 2022-10-17 09:43:20 -0700 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-10-22 03:19:15 +0000 |
| commit | c44e50f4a0ec00c2298f31f91bc2c3e9bbd81c7e (patch) | |
| tree | aba6bb9d0f26928bada14ad5e4d6a04faef33a9d /drivers | |
| parent | 4fc66e7b16adf054e8dc7a5cd189085b8f545091 (diff) | |
| download | linux-stable-c44e50f4a0ec00c2298f31f91bc2c3e9bbd81c7e.tar.gz linux-stable-c44e50f4a0ec00c2298f31f91bc2c3e9bbd81c7e.tar.bz2 linux-stable-c44e50f4a0ec00c2298f31f91bc2c3e9bbd81c7e.zip | |
scsi: lpfc: Fix hard lockup when reading the rx_monitor from debugfs
During I/O and simultaneous cat of /sys/kernel/debug/lpfc/fnX/rx_monitor, a
hard lockup similar to the call trace below may occur.
The spin_lock_bh in lpfc_rx_monitor_report is not protecting from timer
interrupts as expected, so change the strength of the spin lock to _irq.
Kernel panic - not syncing: Hard LOCKUP
CPU: 3 PID: 110402 Comm: cat Kdump: loaded
exception RIP: native_queued_spin_lock_slowpath+91
[IRQ stack]
native_queued_spin_lock_slowpath at ffffffffb814e30b
_raw_spin_lock at ffffffffb89a667a
lpfc_rx_monitor_record at ffffffffc0a73a36 [lpfc]
lpfc_cmf_timer at ffffffffc0abbc67 [lpfc]
__hrtimer_run_queues at ffffffffb8184250
hrtimer_interrupt at ffffffffb8184ab0
smp_apic_timer_interrupt at ffffffffb8a026ba
apic_timer_interrupt at ffffffffb8a01c4f
[End of IRQ stack]
apic_timer_interrupt at ffffffffb8a01c4f
lpfc_rx_monitor_report at ffffffffc0a73c80 [lpfc]
lpfc_rx_monitor_read at ffffffffc0addde1 [lpfc]
full_proxy_read at ffffffffb83e7fc3
vfs_read at ffffffffb833fe71
ksys_read at ffffffffb83402af
do_syscall_64 at ffffffffb800430b
entry_SYSCALL_64_after_hwframe at ffffffffb8a000ad
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20221017164323.14536-2-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_sli.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 768294b9bc0b..86ba45ac91c8 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -8150,10 +8150,10 @@ u32 lpfc_rx_monitor_report(struct lpfc_hba *phba, "IO_cnt", "Info", "BWutil(ms)"); } - /* Needs to be _bh because record is called from timer interrupt + /* Needs to be _irq because record is called from timer interrupt * context */ - spin_lock_bh(ring_lock); + spin_lock_irq(ring_lock); while (*head_idx != *tail_idx) { entry = &ring[*head_idx]; @@ -8197,7 +8197,7 @@ u32 lpfc_rx_monitor_report(struct lpfc_hba *phba, if (cnt >= max_read_entries) break; } - spin_unlock_bh(ring_lock); + spin_unlock_irq(ring_lock); return cnt; } |