diff options
| author | Larry Finger <Larry.Finger@lwfinger.net> | 2009-01-03 12:45:12 -0600 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-01-12 14:24:49 -0500 |
| commit | 51fb80fefe736db1182551fec6528d1ef095b0ea (patch) | |
| tree | cc750475df4e2614b0c397391385610e5b058261 /drivers/net/wireless | |
| parent | d1b29405bd3590bc97c4d3ff2c9139ca55e56ccd (diff) | |
p54usb: Fix to prevent SKB memory allocation errors with 4K page size
On x86_64 architecture with 4K page size and SLUB debugging enabled, stress
testing on p54usb has resulted in skb allocation failures of O(1) and extreme
page fragmentation. Reducing rx_mtu fixes this problem by reducing the size of
all receive skb allocations to be of O(0). This change does not impact
performance in any way.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless')
| -rw-r--r-- | drivers/net/wireless/p54/p54common.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c index 82354b974a0..06c64744df2 100644 --- a/drivers/net/wireless/p54/p54common.c +++ b/drivers/net/wireless/p54/p54common.c @@ -138,6 +138,7 @@ int p54_parse_firmware(struct ieee80211_hw *dev, const struct firmware *fw) u8 *fw_version = NULL; size_t len; int i; + int maxlen; if (priv->rx_start) return 0; @@ -195,6 +196,16 @@ int p54_parse_firmware(struct ieee80211_hw *dev, const struct firmware *fw) else priv->rx_mtu = (size_t) 0x620 - priv->tx_hdr_len; + maxlen = priv->tx_hdr_len + /* USB devices */ + sizeof(struct p54_rx_data) + + 4 + /* rx alignment */ + IEEE80211_MAX_FRAG_THRESHOLD; + if (priv->rx_mtu > maxlen && PAGE_SIZE == 4096) { + printk(KERN_INFO "p54: rx_mtu reduced from %d " + "to %d\n", priv->rx_mtu, + maxlen); + priv->rx_mtu = maxlen; + } break; } case BR_CODE_EXPOSED_IF: |