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| author | Ben Hutchings <bhutchings@solarflare.com> | 2009-03-20 13:27:13 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-21 19:06:56 -0700 |
| commit | 85451a951b9511605475fadcc0a8d3aeccefded8 (patch) | |
| tree | 29ab9fbe40a96582c36b5f629b88f3bceae74545 | |
| parent | 28c4605826ab24d04102231fc1f3e8577bec376d (diff) | |
| download | linux-85451a951b9511605475fadcc0a8d3aeccefded8.tar.gz linux-85451a951b9511605475fadcc0a8d3aeccefded8.tar.bz2 linux-85451a951b9511605475fadcc0a8d3aeccefded8.zip | |
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>
| -rw-r--r-- | drivers/net/sfc/falcon_io.h | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/net/sfc/falcon_io.h b/drivers/net/sfc/falcon_io.h index c16da3149fa9..8883092dae97 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 */ |