提交 03ea1115 编写于 作者: E Eric Moore 提交者: James Bottomley

[SCSI] mpt2sas : the sanity check in base_interrupt needs to be on dword boundary

The poison sanity check on the reply_post_free register needs to be by 32bit,
not 64bit. The poison check is there because its possible that the driver read
the 1st 32bit before the 2nd 32bit has been written to by firmware.  In other
words, this handles race between driver reading the 64 bit register, and it
being dma'd across pci memory from controller firmware as two 32bit pci writes.
Signed-off-by: NEric Moore <eric.moore@lsi.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>
上级 fd01825c
......@@ -636,6 +636,14 @@ _base_unmask_interrupts(struct MPT2SAS_ADAPTER *ioc)
static irqreturn_t
_base_interrupt(int irq, void *bus_id)
{
union reply_descriptor {
u64 word;
struct {
u32 low;
u32 high;
} u;
};
union reply_descriptor rd;
u32 post_index, post_index_next, completed_cmds;
u8 request_desript_type;
u16 smid;
......@@ -656,7 +664,8 @@ _base_interrupt(int irq, void *bus_id)
completed_cmds = 0;
do {
if (ioc->reply_post_free[post_index].Words == ~0ULL)
rd.word = ioc->reply_post_free[post_index].Words;
if (rd.u.low == UINT_MAX || rd.u.high == UINT_MAX)
goto out;
reply = 0;
cb_idx = 0xFF;
......@@ -721,7 +730,7 @@ _base_interrupt(int irq, void *bus_id)
for (i = 0 ; i < completed_cmds; i++) {
post_index = post_index_next;
/* poison the reply post descriptor */
ioc->reply_post_free[post_index_next].Words = ~0ULL;
ioc->reply_post_free[post_index_next].Words = ULLONG_MAX;
post_index_next = (post_index ==
(ioc->reply_post_queue_depth - 1))
? 0 : post_index + 1;
......@@ -3068,7 +3077,7 @@ _base_make_ioc_operational(struct MPT2SAS_ADAPTER *ioc, u8 VF_ID,
/* initialize Reply Post Free Queue */
for (i = 0; i < ioc->reply_post_queue_depth; i++)
ioc->reply_post_free[i].Words = ~0ULL;
ioc->reply_post_free[i].Words = ULLONG_MAX;
r = _base_send_ioc_init(ioc, VF_ID, sleep_flag);
if (r)
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册