From: Juuso Oikarinen Date: Mon, 22 Feb 2010 06:38:39 +0000 (+0200) Subject: wl1271: Clean up firmware block allocation calculation X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5c9417f1656b0f415f4be5a7cd7195ecadd7dd1a;p=linux-beck.git wl1271: Clean up firmware block allocation calculation This patch simplifies the required block count calculation. Though it introduces a division operator, it greatly simplifies the formula. Signed-off-by: Juuso Oikarinen Reviewed-by: Teemu Paasikivi Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/wl12xx/wl1271_tx.c b/drivers/net/wireless/wl12xx/wl1271_tx.c index a32d3014781d..d3ed63e92cf4 100644 --- a/drivers/net/wireless/wl12xx/wl1271_tx.c +++ b/drivers/net/wireless/wl12xx/wl1271_tx.c @@ -46,7 +46,7 @@ static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra) { struct wl1271_tx_hw_descr *desc; u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra; - u32 total_blocks, excluded; + u32 total_blocks; int id, ret = -EBUSY; /* allocate free identifier for the packet */ @@ -56,12 +56,8 @@ static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra) /* approximate the number of blocks required for this packet in the firmware */ - /* FIXME: try to figure out what is done here and make it cleaner */ - total_blocks = (total_len + 20) >> TX_HW_BLOCK_SHIFT_DIV; - excluded = (total_blocks << 2) + ((total_len + 20) & 0xff) + 34; - total_blocks += (excluded > 252) ? 2 : 1; - total_blocks += TX_HW_BLOCK_SPARE; - + total_blocks = total_len + TX_HW_BLOCK_SIZE - 1; + total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE; if (total_blocks <= wl->tx_blocks_available) { desc = (struct wl1271_tx_hw_descr *)skb_push( skb, total_len - skb->len); diff --git a/drivers/net/wireless/wl12xx/wl1271_tx.h b/drivers/net/wireless/wl12xx/wl1271_tx.h index ca92bd811292..8b9f6b4f5652 100644 --- a/drivers/net/wireless/wl12xx/wl1271_tx.h +++ b/drivers/net/wireless/wl12xx/wl1271_tx.h @@ -26,7 +26,7 @@ #define __WL1271_TX_H__ #define TX_HW_BLOCK_SPARE 2 -#define TX_HW_BLOCK_SHIFT_DIV 8 +#define TX_HW_BLOCK_SIZE 252 #define TX_HW_MGMT_PKT_LIFETIME_TU 2000 /* The chipset reference driver states, that the "aid" value 1