diff options
| author | ching Huang <ching2048@areca.com.tw> | 2021-05-20 09:55:15 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-20 17:05:39 +0300 |
| commit | 024550409022c1d64c4ac9bdc594f3ef4fe5e083 (patch) | |
| tree | 1f3a0e4356e333b7e9c7b17d2a870a9fcb26f821 /drivers/scsi | |
| parent | 20c62caf2eaf05580397368bb813dff19f59d0e9 (diff) | |
| download | linux-024550409022c1d64c4ac9bdc594f3ef4fe5e083.tar.xz | |
scsi: arcmsr: Fix doorbell status being updated late on ARC-1886
[ Upstream commit d9a231226f28261a787535e08d0c78669e1ad010 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/scsi')
| -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 4838f790dac7..9294a2c677b3 100644 --- a/drivers/scsi/arcmsr/arcmsr_hba.c +++ b/drivers/scsi/arcmsr/arcmsr_hba.c @@ -2424,10 +2424,17 @@ 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 */ |