Patch "mwifiex: pcie: don't leak DMA buffers when removing" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    mwifiex: pcie: don't leak DMA buffers when removing

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mwifiex-pcie-don-t-leak-dma-buffers-when-removing.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 4e841d3eb9294ce4137fdb5d0a88f1bceab9c212 Mon Sep 17 00:00:00 2001
From: Brian Norris <briannorris@chromium.org>
Date: Fri, 10 Mar 2017 17:39:21 -0800
Subject: mwifiex: pcie: don't leak DMA buffers when removing

From: Brian Norris <briannorris@chromium.org>

commit 4e841d3eb9294ce4137fdb5d0a88f1bceab9c212 upstream.

When PCIe FLR support was added, much of the remove/release code for
PCIe was migrated to ->down_dev(), but ->down_dev() is never called for
device removal. Let's refactor the cleanup to be done in both cases.

Also, drop the comments above mwifiex_cleanup_pcie(), because they were
clearly wrong, and it's better to have clear and obvious code than to
detail the code steps in comments anyway.

Fixes: 4c5dae59d2e9 ("mwifiex: add PCIe function level reset support")
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/marvell/mwifiex/pcie.c |   41 +++++++++++++---------------
 1 file changed, 20 insertions(+), 21 deletions(-)

--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -2700,6 +2700,21 @@ static void mwifiex_pcie_device_dump(str
 	schedule_work(&pcie_work);
 }
 
+static void mwifiex_pcie_free_buffers(struct mwifiex_adapter *adapter)
+{
+	struct pcie_service_card *card = adapter->card;
+	const struct mwifiex_pcie_card_reg *reg = card->pcie.reg;
+
+	if (reg->sleep_cookie)
+		mwifiex_pcie_delete_sleep_cookie_buf(adapter);
+
+	mwifiex_pcie_delete_cmdrsp_buf(adapter);
+	mwifiex_pcie_delete_evtbd_ring(adapter);
+	mwifiex_pcie_delete_rxbd_ring(adapter);
+	mwifiex_pcie_delete_txbd_ring(adapter);
+	card->cmdrsp_buf = NULL;
+}
+
 /*
  * This function initializes the PCI-E host memory space, WCB rings, etc.
  *
@@ -2812,13 +2827,6 @@ err_enable_dev:
 
 /*
  * This function cleans up the allocated card buffers.
- *
- * The following are freed by this function -
- *      - TXBD ring buffers
- *      - RXBD ring buffers
- *      - Event BD ring buffers
- *      - Command response ring buffer
- *      - Sleep cookie buffer
  */
 static void mwifiex_pcie_cleanup(struct mwifiex_adapter *adapter)
 {
@@ -2834,6 +2842,8 @@ static void mwifiex_pcie_cleanup(struct
 				    "Failed to write driver not-ready signature\n");
 	}
 
+	mwifiex_pcie_free_buffers(adapter);
+
 	if (pdev) {
 		pci_iounmap(pdev, card->pci_mmap);
 		pci_iounmap(pdev, card->pci_mmap1);
@@ -3080,10 +3090,7 @@ err_cre_txbd:
 	pci_iounmap(pdev, card->pci_mmap1);
 }
 
-/* This function cleans up the PCI-E host memory space.
- * Some code is extracted from mwifiex_unregister_dev()
- *
- */
+/* This function cleans up the PCI-E host memory space. */
 static void mwifiex_pcie_down_dev(struct mwifiex_adapter *adapter)
 {
 	struct pcie_service_card *card = adapter->card;
@@ -3095,16 +3102,8 @@ static void mwifiex_pcie_down_dev(struct
 	adapter->seq_num = 0;
 	adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_4K;
 
-	if (card) {
-		if (reg->sleep_cookie)
-			mwifiex_pcie_delete_sleep_cookie_buf(adapter);
-
-		mwifiex_pcie_delete_cmdrsp_buf(adapter);
-		mwifiex_pcie_delete_evtbd_ring(adapter);
-		mwifiex_pcie_delete_rxbd_ring(adapter);
-		mwifiex_pcie_delete_txbd_ring(adapter);
-		card->cmdrsp_buf = NULL;
-	}
+	if (card)
+		mwifiex_pcie_free_buffers(adapter);
 
 	return;
 }


Patches currently in stable-queue which might be from briannorris@chromium.org are

queue-4.9/mwifiex-pcie-don-t-leak-dma-buffers-when-removing.patch