Patch "ath10k: fix dma_mapping_error() handling" has been added to the 4.2-stable tree

Patch "ath10k: fix dma_mapping_error() handling" has been added to the 4.2-stable tree

[gregkh]

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

    ath10k: fix dma_mapping_error() handling

to the 4.2-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:
     ath10k-fix-dma_mapping_error-handling.patch
and it can be found in the queue-4.2 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 5e55e3cbd1042cffa6249f22c10585e63f8a29bf Mon Sep 17 00:00:00 2001
From: Michal Kazior <michal.kazior@tieto.com>
Date: Wed, 19 Aug 2015 13:10:43 +0200
Subject: ath10k: fix dma_mapping_error() handling

From: Michal Kazior <michal.kazior@tieto.com>

commit 5e55e3cbd1042cffa6249f22c10585e63f8a29bf upstream.

The function returns 1 when DMA mapping fails. The
driver would return bogus values and could
possibly confuse itself if DMA failed.

Fixes: 767d34fc67af ("ath10k: remove DMA mapping wrappers")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/ath/ath10k/htc.c    |    4 +++-
 drivers/net/wireless/ath/ath10k/htt_tx.c |    8 ++++++--
 drivers/net/wireless/ath/ath10k/pci.c    |    8 ++++++--
 drivers/net/wireless/ath/ath10k/wmi.c    |    1 +
 4 files changed, 16 insertions(+), 5 deletions(-)

--- a/drivers/net/wireless/ath/ath10k/htc.c
+++ b/drivers/net/wireless/ath/ath10k/htc.c
@@ -145,8 +145,10 @@ int ath10k_htc_send(struct ath10k_htc *h
 	skb_cb->eid = eid;
 	skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
 	ret = dma_mapping_error(dev, skb_cb->paddr);
-	if (ret)
+	if (ret) {
+		ret = -EIO;
 		goto err_credits;
+	}
 
 	sg_item.transfer_id = ep->eid;
 	sg_item.transfer_context = skb;
--- a/drivers/net/wireless/ath/ath10k/htt_tx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_tx.c
@@ -371,8 +371,10 @@ int ath10k_htt_mgmt_tx(struct ath10k_htt
 	skb_cb->paddr = dma_map_single(dev, msdu->data, msdu->len,
 				       DMA_TO_DEVICE);
 	res = dma_mapping_error(dev, skb_cb->paddr);
-	if (res)
+	if (res) {
+		res = -EIO;
 		goto err_free_txdesc;
+	}
 
 	skb_put(txdesc, len);
 	cmd = (struct htt_cmd *)txdesc->data;
@@ -456,8 +458,10 @@ int ath10k_htt_tx(struct ath10k_htt *htt
 	skb_cb->paddr = dma_map_single(dev, msdu->data, msdu->len,
 				       DMA_TO_DEVICE);
 	res = dma_mapping_error(dev, skb_cb->paddr);
-	if (res)
+	if (res) {
+		res = -EIO;
 		goto err_free_txbuf;
+	}
 
 	switch (skb_cb->txmode) {
 	case ATH10K_HW_TXRX_RAW:
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -1546,8 +1546,10 @@ static int ath10k_pci_hif_exchange_bmi_m
 
 	req_paddr = dma_map_single(ar->dev, treq, req_len, DMA_TO_DEVICE);
 	ret = dma_mapping_error(ar->dev, req_paddr);
-	if (ret)
+	if (ret) {
+		ret = -EIO;
 		goto err_dma;
+	}
 
 	if (resp && resp_len) {
 		tresp = kzalloc(*resp_len, GFP_KERNEL);
@@ -1559,8 +1561,10 @@ static int ath10k_pci_hif_exchange_bmi_m
 		resp_paddr = dma_map_single(ar->dev, tresp, *resp_len,
 					    DMA_FROM_DEVICE);
 		ret = dma_mapping_error(ar->dev, resp_paddr);
-		if (ret)
+		if (ret) {
+			ret = EIO;
 			goto err_req;
+		}
 
 		xfer.wait_for_resp = true;
 		xfer.resp_len = 0;
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -2391,6 +2391,7 @@ void ath10k_wmi_event_host_swba(struct a
 				ath10k_warn(ar, "failed to map beacon: %d\n",
 					    ret);
 				dev_kfree_skb_any(bcn);
+				ret = -EIO;
 				goto skip;
 			}
 


Patches currently in stable-queue which might be from michal.kazior@tieto.com are

queue-4.2/ath10k-fix-dma_mapping_error-handling.patch