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Date: Wed, 3 Oct 2012 20:11:22 +0800
From: "NickCheng" <nick.cheng@...ca.com.tw>
To: "'James Bottomley'" <James.Bottomley@...e.de>
Cc: <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/5] SCSI: Add the spinlock for queue buffer access
From: Nick Cheng <nick.cheng@...ca.com.tw>
Add the spinlock for queue buffer access
Signed-off-by: Nick Cheng< nick.cheng@...ca.com.tw >
---
diff -uprN -X linux-vanilla/Documentation/dontdiff
linux-vanilla//drivers/scsi/arcmsr/arcmsr.h
linux-development//drivers/scsi/arcmsr/arcmsr.h
--- linux-vanilla//drivers/scsi/arcmsr/arcmsr.h 2012-10-03
19:31:31.742620819 +0800
+++ linux-development//drivers/scsi/arcmsr/arcmsr.h 2012-10-03
19:31:04.098621088 +0800
@@ -617,6 +617,8 @@ struct AdapterControlBlock
spinlock_t eh_lock;
spinlock_t
ccblist_lock;
spinlock_t postq_lock;
+ spinlock_t rqbuffer_lock;
+ spinlock_t wqbuffer_lock;
union {
struct MessageUnit_A __iomem *pmuA;
struct MessageUnit_B *pmuB;
diff -uprN -X linux-vanilla/Documentation/dontdiff
linux-vanilla//drivers/scsi/arcmsr/arcmsr_hba.c
linux-development//drivers/scsi/arcmsr/arcmsr_hba.c
--- linux-vanilla//drivers/scsi/arcmsr/arcmsr_hba.c 2012-10-03
19:31:31.754620820 +0800
+++ linux-development//drivers/scsi/arcmsr/arcmsr_hba.c 2012-10-03
19:31:04.118621087 +0800
@@ -987,6 +987,8 @@ static int arcmsr_probe(struct pci_dev *
spin_lock_init(&acb->eh_lock);
spin_lock_init(&acb->ccblist_lock);
spin_lock_init(&acb->postq_lock);
+ spin_lock_init(&acb->rqbuffer_lock);
+ spin_lock_init(&acb->wqbuffer_lock);
acb->acb_flags |= (ACB_F_MESSAGE_WQBUFFER_CLEARED |
ACB_F_MESSAGE_RQBUFFER_CLEARED |
ACB_F_MESSAGE_WQBUFFER_READED);
@@ -1927,10 +1929,12 @@ static struct QBUFFER __iomem *arcmsr_ge
static void arcmsr_iop2drv_data_wrote_handle(struct AdapterControlBlock
*acb)
{
+ uint8_t __iomem *iop_data;
struct QBUFFER __iomem *prbuffer;
struct QBUFFER *pQbuffer;
- uint8_t __iomem *iop_data;
int32_t my_empty_len, iop_len, rqbuf_firstindex, rqbuf_lastindex;
+ unsigned long flags;
+ spin_lock_irqsave(&acb->rqbuffer_lock, flags);
rqbuf_lastindex = acb->rqbuf_lastindex;
rqbuf_firstindex = acb->rqbuf_firstindex;
prbuffer = arcmsr_get_iop_rqbuffer(acb);
@@ -1952,10 +1956,13 @@ static void arcmsr_iop2drv_data_wrote_ha
} else {
acb->acb_flags |= ACB_F_IOPDATA_OVERFLOW;
}
+ spin_unlock_irqrestore(&acb->rqbuffer_lock, flags);
}
static void arcmsr_iop2drv_data_read_handle(struct AdapterControlBlock
*acb)
{
+ unsigned long flags;
+ spin_lock_irqsave(&acb->wqbuffer_lock, flags);
acb->acb_flags |= ACB_F_MESSAGE_WQBUFFER_READED;
if (acb->wqbuf_firstindex != acb->wqbuf_lastindex) {
uint8_t *pQbuffer;
@@ -1984,6 +1991,7 @@ static void arcmsr_iop2drv_data_read_han
if (acb->wqbuf_firstindex == acb->wqbuf_lastindex) {
acb->acb_flags |= ACB_F_MESSAGE_WQBUFFER_CLEARED;
}
+ spin_unlock_irqrestore(&acb->wqbuffer_lock, flags);
}
static void arcmsr_hbaA_doorbell_isr(struct AdapterControlBlock *acb)
@@ -2403,6 +2411,7 @@ static int arcmsr_iop_message_xfer(struc
unsigned char *ver_addr;
uint8_t *pQbuffer, *ptmpQbuffer;
int32_t allxfer_len = 0;
+ unsigned long flags;
ver_addr = kmalloc(1032, GFP_ATOMIC);
if (!ver_addr) {
@@ -2411,6 +2420,7 @@ static int arcmsr_iop_message_xfer(struc
}
ptmpQbuffer = ver_addr;
+ spin_lock_irqsave(&acb->rqbuffer_lock, flags);
while ((acb->rqbuf_firstindex != acb->rqbuf_lastindex)
&& (allxfer_len < 1031)) {
pQbuffer = &acb->rqbuffer[acb->rqbuf_firstindex];
@@ -2439,6 +2449,7 @@ static int arcmsr_iop_message_xfer(struc
}
arcmsr_iop_message_read(acb);
}
+ spin_unlock_irqrestore(&acb->rqbuffer_lock, flags);
memcpy(pcmdmessagefld->messagedatabuffer, ver_addr,
allxfer_len);
pcmdmessagefld->cmdmessage.Length = allxfer_len;
if(acb->fw_flag == FW_DEADLOCK) {
@@ -2452,8 +2463,9 @@ static int arcmsr_iop_message_xfer(struc
case ARCMSR_MESSAGE_WRITE_WQBUFFER: {
unsigned char *ver_addr;
- int32_t my_empty_len, user_len, wqbuf_firstindex,
wqbuf_lastindex;
uint8_t *pQbuffer, *ptmpuserbuffer;
+ int32_t my_empty_len, user_len, wqbuf_firstindex,
wqbuf_lastindex;
+ unsigned long flags;
ver_addr = kmalloc(1032, GFP_ATOMIC);
if (!ver_addr) {
@@ -2470,6 +2482,7 @@ static int arcmsr_iop_message_xfer(struc
ptmpuserbuffer = ver_addr;
user_len = pcmdmessagefld->cmdmessage.Length;
memcpy(ptmpuserbuffer, pcmdmessagefld->messagedatabuffer,
user_len);
+ spin_lock_irqsave(&acb->wqbuffer_lock, flags);
wqbuf_lastindex = acb->wqbuf_lastindex;
wqbuf_firstindex = acb->wqbuf_firstindex;
if (wqbuf_lastindex != wqbuf_firstindex) {
@@ -2513,7 +2526,8 @@ static int arcmsr_iop_message_xfer(struc
retvalue = ARCMSR_MESSAGE_FAIL;
}
}
- kfree(ver_addr);
+ spin_unlock_irqrestore(&acb->wqbuffer_lock, flags);
+ kfree(ver_addr);
}
break;
--
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