diff options
Diffstat (limited to 'drivers/net/wireless/ath/main.c')
| -rw-r--r-- | drivers/net/wireless/ath/main.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/main.c b/drivers/net/wireless/ath/main.c index 9949b11cb15..487193f1de1 100644 --- a/drivers/net/wireless/ath/main.c +++ b/drivers/net/wireless/ath/main.c @@ -17,6 +17,42 @@ #include <linux/kernel.h> #include <linux/module.h> +#include "ath.h" + MODULE_AUTHOR("Atheros Communications"); MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards."); MODULE_LICENSE("Dual BSD/GPL"); + +struct sk_buff *ath_rxbuf_alloc(struct ath_common *common, + u32 len, + gfp_t gfp_mask) +{ + struct sk_buff *skb; + u32 off; + + /* + * Cache-line-align. This is important (for the + * 5210 at least) as not doing so causes bogus data + * in rx'd frames. + */ + + /* Note: the kernel can allocate a value greater than + * what we ask it to give us. We really only need 4 KB as that + * is this hardware supports and in fact we need at least 3849 + * as that is the MAX AMSDU size this hardware supports. + * Unfortunately this means we may get 8 KB here from the + * kernel... and that is actually what is observed on some + * systems :( */ + skb = __dev_alloc_skb(len + common->cachelsz - 1, gfp_mask); + if (skb != NULL) { + off = ((unsigned long) skb->data) % common->cachelsz; + if (off != 0) + skb_reserve(skb, common->cachelsz - off); + } else { + printk(KERN_ERR "skbuff alloc of size %u failed\n", len); + return NULL; + } + + return skb; +} +EXPORT_SYMBOL(ath_rxbuf_alloc); |