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Re: [Regression]BCM4312 is broken in kernel 4.18[Root cause found]

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On 08/24/2018 03:23 AM, Kalle Valo wrote:
Michael Büsch <m@xxxxxxx> writes:

On Thu, 23 Aug 2018 23:00:53 +0530
prabhu <d.praabhu@xxxxxxxxx> wrote:

The following commits introduce this regression in 4.18
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=66cffd6daab76caebab26eb803b92182414fc182

Ok. Kalle, can you please revert the commit
66cffd6daab76caebab26eb803b92182414fc182
?

Please submit a proper patch with an explanation why it needs to be
reverted.

Before doing a revert, let's see if we can keep the fix for open firmware, the situation for which commit 66cffd6daab7 was "needed". I think the following should do:

diff --git a/drivers/net/wireless/broadcom/b43/dma.c b/drivers/net/wireless/broadcom/b43/dma.c
index 6b0e1ec346cb..2c37366b3592 100644
--- a/drivers/net/wireless/broadcom/b43/dma.c
+++ b/drivers/net/wireless/broadcom/b43/dma.c
@@ -1519,12 +1519,14 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev,
                } else {
                        /* More than a single header/data pair were missed.
                         * Report this error, and reset the controller to
-                        * revive operation.
+                        * revive operation. If running the open-source
+                        * firmware, then do a restart.
                         */
                        b43dbg(dev->wl,
"Out of order TX status report on DMA ring %d. Expected %d, but got %d\n",
                               ring->index, firstused, slot);
-                       b43_controller_restart(dev, "Out of order TX");
+                       if (dev->fw.opensource)
+                               b43_controller_restart(dev, "Out of order TX");
                        return;
                }
        }

At the moment, I am working with prabhu to see if upgrading his firmware will help his problem with no change in the driver. If not, then I will have him test this patch.

Larry



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