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scsi: hisi_sas: lock sensitive regions when servicing CQ interrupt 

There is a bug in the current driver in that certain hisi_hba and port
structure elements which we access when servicing the CQ interrupt do
not use thread-safe accesses; these include hisi_sas_port linked-list of
active slots (hisi_sas_port.entry), bitmap of currently allocated IPTT
(in hisi_hba.slot_index_tags), and completion queue read pointer.

As a solution, lock these elements with the hisi_hba.lock.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Xiang Chen <chenxiang66@hisilicon.com>
Reviewed-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
John Garry 2017-01-03 20:24:49 +08:00 committed by Martin K. Petersen
parent d177c40811
commit 64d6318732
2 changed files with 4 additions and 0 deletions
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2
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
View File

@ -1596,6 +1596,7 @@ static irqreturn_t cq_interrupt_v1_hw(int irq, void *p)
hisi_hba->complete_hdr[queue];
u32 irq_value, rd_point = cq->rd_point, wr_point;
spin_lock(&hisi_hba->lock);
irq_value = hisi_sas_read32(hisi_hba, OQ_INT_SRC);
hisi_sas_write32(hisi_hba, OQ_INT_SRC, 1 << queue);
@ -1628,6 +1629,7 @@ static irqreturn_t cq_interrupt_v1_hw(int irq, void *p)
/* update rd_point */
cq->rd_point = rd_point;
hisi_sas_write32(hisi_hba, COMPL_Q_0_RD_PTR + (0x14 * queue), rd_point);
spin_unlock(&hisi_hba->lock);
return IRQ_HANDLED;
}

2
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
View File

@ -2493,6 +2493,7 @@ static void cq_tasklet_v2_hw(unsigned long val)
complete_queue = hisi_hba->complete_hdr[queue];
spin_lock(&hisi_hba->lock);
wr_point = hisi_sas_read32(hisi_hba, COMPL_Q_0_WR_PTR +
(0x14 * queue));
@ -2542,6 +2543,7 @@ static void cq_tasklet_v2_hw(unsigned long val)
/* update rd_point */
cq->rd_point = rd_point;
hisi_sas_write32(hisi_hba, COMPL_Q_0_RD_PTR + (0x14 * queue), rd_point);
spin_unlock(&hisi_hba->lock);
}
static irqreturn_t cq_interrupt_v2_hw(int irq_no, void *p)