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Subject[PATCH] qla2xxx: make msix interrupt handler safe for irq
Date
Yinghai has reported a lockdep warning on qla2xxx:

[ 77.965784] WARNING: at kernel/lockdep.c:2332
trace_hardirqs_on_caller+0xc6/0x14b()
[ 77.977492] Hardware name: Sun
[ 77.979485] Modules linked in:
[ 77.994337] Pid: 0, comm: swapper Not tainted
2.6.33-rc4-tip-yh-03949-g3a8e3f5-dirty #64
[ 78.000120] Call Trace:
[ 78.013298] <IRQ> [<ffffffff81076b54>] warn_slowpath_common+0x7c/0x94
[ 78.017746] [<ffffffff81cd712c>] ? _raw_spin_unlock_irq+0x30/0x36
[ 78.035171] [<ffffffff81076b80>] warn_slowpath_null+0x14/0x16
[ 78.040152] [<ffffffff810a2ae8>] trace_hardirqs_on_caller+0xc6/0x14b
[ 78.055400] [<ffffffff810a2b7a>] trace_hardirqs_on+0xd/0xf
[ 78.058951] [<ffffffff81cd712c>] _raw_spin_unlock_irq+0x30/0x36
[ 78.074889] [<ffffffff816461ef>] qla24xx_msix_default+0x243/0x281
[ 78.091598] [<ffffffff810a5752>] ? __lock_release+0xa5/0xae
[ 78.096799] [<ffffffff810c02ae>] handle_IRQ_event+0x53/0x113
[ 78.111568] [<ffffffff810c2061>] handle_edge_irq+0xf3/0x13b
[ 78.116255] [<ffffffff81035109>] handle_irq+0x24/0x2f
[ 78.132063] [<ffffffff81cdc4b4>] do_IRQ+0x5c/0xc3
[ 78.134684] [<ffffffff81cd7393>] ret_from_intr+0x0/0xf
[ 78.137903] <EOI> [<ffffffff81039a56>] ? mwait_idle+0xaf/0xbb
[ 78.155674] [<ffffffff81039a4d>] ? mwait_idle+0xa6/0xbb
[ 78.158600] [<ffffffff81031c7c>] cpu_idle+0x61/0xa1
[ 78.174333] [<ffffffff81c85d7a>] rest_init+0x7e/0x80
[ 78.178122] [<ffffffff82832d1f>] start_kernel+0x316/0x31d
[ 78.193623] [<ffffffff82832297>] x86_64_start_reservations+0xa7/0xab
[ 78.198924] [<ffffffff8283237f>] x86_64_start_kernel+0xe4/0xeb
[ 78.214540] ---[ end trace be4529f30a2e4ef5 ]---
This was happened when qla2xxx msix interrupt handler is trying to enable
IRQs by spin_unlock_irq(). We should make interrupt handler safe for IRQs,
use spin_lock_irqsave/spin_unlock_irqrestore, this will not break the IRQs
status in interrupt handler.

Reported-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Xiaotian Feng <dfeng@redhat.com>
Cc: Andrew Vasquez <andrew.vasquez@qlogic.com>
Cc: James E.J. Bottomley <James.Bottomley@suse.de>
Cc: Giridhar Malavali <giridhar.malavali@qlogic.com>
Cc: Anirban Chakraborty <anirban.chakraborty@qlogic.com>
Cc: Santosh Vernekar <santosh.vernekar@qlogic.com>
---
drivers/scsi/qla2xxx/qla_isr.c | 15 +++++++++------
1 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index ffd0efd..0ced91c 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1917,6 +1917,7 @@ qla24xx_msix_rsp_q(int irq, void *dev_id)
struct rsp_que *rsp;
struct device_reg_24xx __iomem *reg;
struct scsi_qla_host *vha;
+ unsigned long flags;

rsp = (struct rsp_que *) dev_id;
if (!rsp) {
@@ -1927,7 +1928,7 @@ qla24xx_msix_rsp_q(int irq, void *dev_id)
ha = rsp->hw;
reg = &ha->iobase->isp24;

- spin_lock_irq(&ha->hardware_lock);
+ spin_lock_irqsave(&ha->hardware_lock, flags);

vha = qla25xx_get_host(rsp);
qla24xx_process_response_queue(vha, rsp);
@@ -1935,7 +1936,7 @@ qla24xx_msix_rsp_q(int irq, void *dev_id)
WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
RD_REG_DWORD_RELAXED(&reg->hccr);
}
- spin_unlock_irq(&ha->hardware_lock);
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);

return IRQ_HANDLED;
}
@@ -1946,6 +1947,7 @@ qla25xx_msix_rsp_q(int irq, void *dev_id)
struct qla_hw_data *ha;
struct rsp_que *rsp;
struct device_reg_24xx __iomem *reg;
+ unsigned long flags;

rsp = (struct rsp_que *) dev_id;
if (!rsp) {
@@ -1958,10 +1960,10 @@ qla25xx_msix_rsp_q(int irq, void *dev_id)
/* Clear the interrupt, if enabled, for this response queue */
if (rsp->options & ~BIT_6) {
reg = &ha->iobase->isp24;
- spin_lock_irq(&ha->hardware_lock);
+ spin_lock_irqsave(&ha->hardware_lock, flags);
WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
RD_REG_DWORD_RELAXED(&reg->hccr);
- spin_unlock_irq(&ha->hardware_lock);
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
}
queue_work_on((int) (rsp->id - 1), ha->wq, &rsp->q_work);

@@ -1979,6 +1981,7 @@ qla24xx_msix_default(int irq, void *dev_id)
uint32_t stat;
uint32_t hccr;
uint16_t mb[4];
+ unsigned long flags;

rsp = (struct rsp_que *) dev_id;
if (!rsp) {
@@ -1990,7 +1993,7 @@ qla24xx_msix_default(int irq, void *dev_id)
reg = &ha->iobase->isp24;
status = 0;

- spin_lock_irq(&ha->hardware_lock);
+ spin_lock_irqsave(&ha->hardware_lock, flags);
vha = pci_get_drvdata(ha->pdev);
do {
stat = RD_REG_DWORD(&reg->host_status);
@@ -2039,7 +2042,7 @@ qla24xx_msix_default(int irq, void *dev_id)
}
WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
} while (0);
- spin_unlock_irq(&ha->hardware_lock);
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);

if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
(status & MBX_INTERRUPT) && ha->flags.mbox_int) {
--
1.6.6


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