Commit 147b502b authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Kalle Valo
Browse files

wlcore: simplify/fix/optimize reg_ch_conf_pending operations 



Bitmaps are defined on unsigned longs, so the usage of u32[2] in the
wlcore driver is incorrect.  As noted by Peter Zijlstra, casting arrays
to a bitmap is incorrect for big-endian architectures.

When looking at it I observed that:

- operations on reg_ch_conf_pending is always under the wl_lock mutex,
so set_bit is overkill

- the only case where reg_ch_conf_pending is accessed a u32 at a time is
unnecessary too.

This patch cleans up everything in this area, and changes tmp_ch_bitmap
to have the proper alignment.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarFenghua Yu <fenghua.yu@intel.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent 324f1feb

drivers/net/wireless/ti/wlcore/cmd.c

+6 −9
Original line number Diff line number Diff line
@@ -1700,14 +1700,14 @@ void wlcore_set_pending_regdomain_ch(struct wl1271 *wl, u16 channel, 
	ch_bit_idx = wlcore_get_reg_conf_ch_idx(band, channel);



	if (ch_bit_idx >= 0 && ch_bit_idx <= WL1271_MAX_CHANNELS)

		set_bit(ch_bit_idx, (long *)wl->reg_ch_conf_pending);

		__set_bit_le(ch_bit_idx, (long *)wl->reg_ch_conf_pending);

}



int wlcore_cmd_regdomain_config_locked(struct wl1271 *wl)

{

	struct wl12xx_cmd_regdomain_dfs_config *cmd = NULL;

	int ret = 0, i, b, ch_bit_idx;

	u32 tmp_ch_bitmap[2];

	__le32 tmp_ch_bitmap[2] __aligned(sizeof(unsigned long));

	struct wiphy *wiphy = wl->hw->wiphy;

	struct ieee80211_supported_band *band;

	bool timeout = false;
@@ -1717,7 +1717,7 @@ int wlcore_cmd_regdomain_config_locked(struct wl1271 *wl) 


	wl1271_debug(DEBUG_CMD, "cmd reg domain config");



	memset(tmp_ch_bitmap, 0, sizeof(tmp_ch_bitmap));

	memcpy(tmp_ch_bitmap, wl->reg_ch_conf_pending, sizeof(tmp_ch_bitmap));



	for (b = NL80211_BAND_2GHZ; b <= NL80211_BAND_5GHZ; b++) {

		band = wiphy->bands[b];
@@ -1738,13 +1738,10 @@ int wlcore_cmd_regdomain_config_locked(struct wl1271 *wl) 
			if (ch_bit_idx < 0)

				continue;



			set_bit(ch_bit_idx, (long *)tmp_ch_bitmap);

			__set_bit_le(ch_bit_idx, (long *)tmp_ch_bitmap);

		}

	}



	tmp_ch_bitmap[0] |= wl->reg_ch_conf_pending[0];

	tmp_ch_bitmap[1] |= wl->reg_ch_conf_pending[1];



	if (!memcmp(tmp_ch_bitmap, wl->reg_ch_conf_last, sizeof(tmp_ch_bitmap)))

		goto out;
@@ -1754,8 +1751,8 @@ int wlcore_cmd_regdomain_config_locked(struct wl1271 *wl) 
		goto out;

	}



	cmd->ch_bit_map1 = cpu_to_le32(tmp_ch_bitmap[0]);

	cmd->ch_bit_map2 = cpu_to_le32(tmp_ch_bitmap[1]);

	cmd->ch_bit_map1 = tmp_ch_bitmap[0];

	cmd->ch_bit_map2 = tmp_ch_bitmap[1];

	cmd->dfs_region = wl->dfs_region;



	wl1271_debug(DEBUG_CMD,

drivers/net/wireless/ti/wlcore/wlcore.h

+2 −2
Original line number Diff line number Diff line
@@ -320,9 +320,9 @@ struct wl1271 { 
	bool watchdog_recovery;



	/* Reg domain last configuration */

	u32 reg_ch_conf_last[2]  __aligned(8);

	DECLARE_BITMAP(reg_ch_conf_last, 64);

	/* Reg domain pending configuration */

	u32 reg_ch_conf_pending[2];

	DECLARE_BITMAP(reg_ch_conf_pending, 64);



	/* Pointer that holds DMA-friendly block for the mailbox */

	void *mbox;

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