Re: [PATCH] b43: fix regression in PIO case

On Tue, 27 Dec 2011, Rafał Miłecki wrote:

W dniu 26 grudnia 2011 18:28 użytkownik Guennadi Liakhovetski
[off-list ref] napisał:

quoted

This patch fixes the regression, introduced by

commit 17030f48e31adde5b043741c91ba143f5f7db0fd
From: Rafał Miłecki <zajec5@gmail.com>
Date: Thu, 11 Aug 2011 17:16:27 +0200
Subject: [PATCH] b43: support new RX header, noticed to be used in 598.314+ fw

in PIO case.

Signed-off-by: Guennadi Liakhovetski <redacted>
---

diff --git a/drivers/net/wireless/b43/pio.c b/drivers/net/wireless/b43/pio.c
index ce8a4bd..b64b64c 100644
--- a/drivers/net/wireless/b43/pio.c
+++ b/drivers/net/wireless/b43/pio.c

@@ -617,9 +617,19 @@ static bool pio_rx_frame(struct b43_pio_rxqueue *q)

       const char *err_msg = NULL;
       struct b43_rxhdr_fw4 *rxhdr =
               (struct b43_rxhdr_fw4 *)wl->pio_scratchspace;
+       size_t rxhdr_size = sizeof(*rxhdr);

       BUILD_BUG_ON(sizeof(wl->pio_scratchspace) < sizeof(*rxhdr));
-       memset(rxhdr, 0, sizeof(*rxhdr));
+       switch (dev->fw.hdr_format) {
+       case B43_FW_HDR_410:
+       case B43_FW_HDR_351:
+               rxhdr_size -= sizeof(rxhdr->format_598) -
+                       sizeof(rxhdr->format_351);
+               break;
+       case B43_FW_HDR_598:
+               break;
+       }
+       memset(rxhdr, 0, rxhdr_size);

Huuh, that's really tricky. Can you just do "normal" conditions as
Larry suggested, please?

Sorry? I absolutely see nothing tricky there. Do you think this would look 
"less tricky" to you:

	switch (dev->fw.hdr_format) {
	case B43_FW_HDR_410:
	case B43_FW_HDR_351:
		rxhdr_size = offsetof(struct b43_rxhdr_fw4,
					format_351) +
			sizeof(rxhdr_size->format_351);
		break;
	case B43_FW_HDR_598:
		rxhdr_size = sizeof(*rxhdr);
		break;
	}

?

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/