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cciss: factor out cciss_enable_scsi_prefetch()

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cciss: factor out cciss_enable_scsi_prefetch()

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Stephen M. Cameron 2010-07-19 13:45:41 -05:00 committed by Jens Axboe
parent 501b92cd6b
commit 322e304c4d
1 changed files with 13 additions and 10 deletions
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23
drivers/block/cciss.c
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@ -4108,6 +4108,18 @@ static inline bool CISS_signature_present(ctlr_info_t *h)
return true;
}
/* Need to enable prefetch in the SCSI core for 6400 in x86 */
static inline void cciss_enable_scsi_prefetch(ctlr_info_t *h)
{
#ifdef CONFIG_X86
u32 prefetch;
prefetch = readl(&(h->cfgtable->SCSI_Prefetch));
prefetch |= 0x100;
writel(prefetch, &(h->cfgtable->SCSI_Prefetch));
#endif
}
static int __devinit cciss_pci_init(ctlr_info_t *c)
{
int prod_index, err;
@ -4169,16 +4181,7 @@ static int __devinit cciss_pci_init(ctlr_info_t *c)
err = -ENODEV;
goto err_out_free_res;
}
#ifdef CONFIG_X86
{
/* Need to enable prefetch in the SCSI core for 6400 in x86 */
__u32 prefetch;
prefetch = readl(&(c->cfgtable->SCSI_Prefetch));
prefetch |= 0x100;
writel(prefetch, &(c->cfgtable->SCSI_Prefetch));
}
#endif
cciss_enable_scsi_prefetch(c);
/* Disabling DMA prefetch and refetch for the P600.
* An ASIC bug may result in accesses to invalid memory addresses.
* We've disabled prefetch for some time now. Testing with XEN