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path: root/drivers/net/wireless/ath/main.c
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Diffstat (limited to 'drivers/net/wireless/ath/main.c')
-rw-r--r--drivers/net/wireless/ath/main.c36
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);