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authorBen Hutchings <bhutchings@solarflare.com>2009-03-20 13:27:13 +0000
committerDavid S. Miller <davem@davemloft.net>2009-03-21 19:06:56 -0700
commit85451a951b9511605475fadcc0a8d3aeccefded8 (patch)
tree29ab9fbe40a96582c36b5f629b88f3bceae74545 /drivers/net/sfc
parent28c4605826ab24d04102231fc1f3e8577bec376d (diff)
sfc: Optimise falcon_writel_page_locked() for page > 0
The bug this function works around only applies to the first set of page-mapped registers; other pages can be written without locking. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/sfc')
-rw-r--r--drivers/net/sfc/falcon_io.h13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/net/sfc/falcon_io.h b/drivers/net/sfc/falcon_io.h
index c16da3149fa..8883092dae9 100644
--- a/drivers/net/sfc/falcon_io.h
+++ b/drivers/net/sfc/falcon_io.h
@@ -238,18 +238,21 @@ static inline void falcon_writel_page(struct efx_nic *efx, efx_dword_t *value,
/* Write dword to Falcon page-mapped register with an extra lock.
*
* As for falcon_writel_page(), but for a register that suffers from
- * SFC bug 3181. Take out a lock so the BIU collector cannot be
- * confused. */
+ * SFC bug 3181. If writing to page 0, take out a lock so the BIU
+ * collector cannot be confused.
+ */
static inline void falcon_writel_page_locked(struct efx_nic *efx,
efx_dword_t *value,
unsigned int reg,
unsigned int page)
{
- unsigned long flags;
+ unsigned long flags = 0;
- spin_lock_irqsave(&efx->biu_lock, flags);
+ if (page == 0)
+ spin_lock_irqsave(&efx->biu_lock, flags);
falcon_writel(efx, value, FALCON_PAGED_REG(page, reg));
- spin_unlock_irqrestore(&efx->biu_lock, flags);
+ if (page == 0)
+ spin_unlock_irqrestore(&efx->biu_lock, flags);
}
#endif /* EFX_FALCON_IO_H */