From: ching Huang Date: Wed, 22 Mar 2023 17:20:35 +0000 (+0800) Subject: scsi: arcmsr: Fix reading empty buffer length X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3e40814818cee1b564962786f867fb71bb754686;p=linux.git scsi: arcmsr: Fix reading empty buffer length Fix empty buffer length error which causes ARECA CLI app command timeout. Signed-off-by: ching Huang Link: https://lore.kernel.org/r/4aec4385abc6eab10b575c28130ec615a144492d.camel@areca.com.tw Signed-off-by: Martin K. Petersen --- diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c index ce92d4281da6f..f97936d66a6a1 100644 --- a/drivers/scsi/arcmsr/arcmsr_hba.c +++ b/drivers/scsi/arcmsr/arcmsr_hba.c @@ -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;