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[SCSI] qla2xxx: Rework MSI-X handlers. 

Since MSI-X vectors do not require a clearing "handshake" from
the system perspective, and the registered handler will not be
called more than once for one occurrence of receipt of a vector,
there is no requirement to flush the risc register write clearing
the interrupt condition in the risc. Also, since the msi-x
registered handlers are optimised for a particular vector, it is
preferable to handle the one vector received per invocation of
the handler.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Andrew Vasquez 2007-09-20 14:07:49 -07:00 committed by James Bottomley
parent 8b3253d10f
commit 87f27015b8
1 changed files with 2 additions and 5 deletions
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7
drivers/scsi/qla2xxx/qla_isr.c
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@ -1679,7 +1679,6 @@ qla24xx_msix_rsp_q(int irq, void *dev_id)
qla24xx_process_response_queue(ha);
WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
RD_REG_DWORD_RELAXED(&reg->hccr);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
@ -1693,7 +1692,6 @@ qla24xx_msix_default(int irq, void *dev_id)
struct device_reg_24xx __iomem *reg;
int status;
unsigned long flags;
unsigned long iter;
uint32_t stat;
uint32_t hccr;
uint16_t mb[4];
@ -1703,7 +1701,7 @@ qla24xx_msix_default(int irq, void *dev_id)
status = 0;
spin_lock_irqsave(&ha->hardware_lock, flags);
for (iter = 50; iter--; ) {
do {
stat = RD_REG_DWORD(&reg->host_status);
if (stat & HSRX_RISC_PAUSED) {
if (pci_channel_offline(ha->pdev))
@ -1748,8 +1746,7 @@ qla24xx_msix_default(int irq, void *dev_id)
break;
}
WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
RD_REG_DWORD_RELAXED(&reg->hccr);
}
} while (0);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&