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| author | ching Huang <ching2048@areca.com.tw> | 2021-05-20 14:55:15 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-05-21 16:54:47 -0400 |
| commit | d9a231226f28261a787535e08d0c78669e1ad010 (patch) | |
| tree | 35e7d0677b56b57deed5184c3c73d4d0eadf7445 /drivers/scsi/arcmsr | |
| parent | 2a38d2a8b4a6777d37b7b8b8416b60fe0af73cd2 (diff) | |
| download | linux-d9a231226f28261a787535e08d0c78669e1ad010.tar.gz | |
scsi: arcmsr: Fix doorbell status being updated late on ARC-1886
It is possible for the IOP to be delayed in updating the doorbell status. The doorbell status should not be 0 so loop until the value changes. Link: https://lore.kernel.org/r/afdfdf7eabecf14632492c4987a6b9ac6312a7ad.camel@areca.com.tw Signed-off-by: ching Huang <ching2048@areca.com.tw> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/arcmsr')
| -rw-r--r-- | drivers/scsi/arcmsr/arcmsr_hba.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c index 930972cda38c..42e494a7106c 100644 --- a/drivers/scsi/arcmsr/arcmsr_hba.c +++ b/drivers/scsi/arcmsr/arcmsr_hba.c @@ -2419,10 +2419,17 @@ static void arcmsr_hbaD_doorbell_isr(struct AdapterControlBlock *pACB) static void arcmsr_hbaE_doorbell_isr(struct AdapterControlBlock *pACB) { - uint32_t outbound_doorbell, in_doorbell, tmp; + uint32_t outbound_doorbell, in_doorbell, tmp, i; struct MessageUnit_E __iomem *reg = pACB->pmuE; - in_doorbell = readl(®->iobound_doorbell); + if (pACB->adapter_type == ACB_ADAPTER_TYPE_F) { + for (i = 0; i < 5; i++) { + in_doorbell = readl(®->iobound_doorbell); + if (in_doorbell != 0) + break; + } + } else + in_doorbell = readl(®->iobound_doorbell); outbound_doorbell = in_doorbell ^ pACB->in_doorbell; do { writel(0, ®->host_int_status); /* clear interrupt */ |