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scsi: arcmsr: Fix reading empty buffer length

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Fix empty buffer length error which causes ARECA CLI app command timeout.

Signed-off-by: ching Huang <ching2048@areca.com.tw>
Link: https://lore.kernel.org/r/4aec4385abc6eab10b575c28130ec615a144492d.camel@areca.com.tw
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
ching Huang 2023-03-23 01:20:35 +08:00 committed by Martin K. Petersen
parent c3e9b937fb
commit 3e40814818
1 changed files with 5 additions and 2 deletions
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7
drivers/scsi/arcmsr/arcmsr_hba.c
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@ -2255,8 +2255,11 @@ static void arcmsr_iop2drv_data_wrote_handle(struct AdapterControlBlock *acb)
spin_lock_irqsave(&acb->rqbuffer_lock, flags);
prbuffer = arcmsr_get_iop_rqbuffer(acb);
buf_empty_len = (acb->rqbuf_putIndex - acb->rqbuf_getIndex - 1) &
(ARCMSR_MAX_QBUFFER - 1);
if (acb->rqbuf_putIndex >= acb->rqbuf_getIndex) {
buf_empty_len = (ARCMSR_MAX_QBUFFER - 1) -
(acb->rqbuf_putIndex - acb->rqbuf_getIndex);
} else
buf_empty_len = acb->rqbuf_getIndex - acb->rqbuf_putIndex - 1;
if (buf_empty_len >= readl(&prbuffer->data_len)) {
if (arcmsr_Read_iop_rqbuffer_data(acb, prbuffer) == 0)
acb->acb_flags |= ACB_F_IOPDATA_OVERFLOW;