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authorching Huang <ching2048@areca.com.tw>2021-05-20 14:55:15 +0800
committerMartin K. Petersen <martin.petersen@oracle.com>2021-05-21 16:54:47 -0400
commitd9a231226f28261a787535e08d0c78669e1ad010 (patch)
tree35e7d0677b56b57deed5184c3c73d4d0eadf7445 /drivers/scsi/arcmsr
parent2a38d2a8b4a6777d37b7b8b8416b60fe0af73cd2 (diff)
downloadlinux-d9a231226f28261a787535e08d0c78669e1ad010.tar.bz2
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.c11
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(&reg->iobound_doorbell);
+ if (pACB->adapter_type == ACB_ADAPTER_TYPE_F) {
+ for (i = 0; i < 5; i++) {
+ in_doorbell = readl(&reg->iobound_doorbell);
+ if (in_doorbell != 0)
+ break;
+ }
+ } else
+ in_doorbell = readl(&reg->iobound_doorbell);
outbound_doorbell = in_doorbell ^ pACB->in_doorbell;
do {
writel(0, &reg->host_int_status); /* clear interrupt */