[PATCH 2/2] mwifiex: print URB submit failure error after threshold attemtps

[Ganapathi Bhat]

Current driver prints dev_alloc_skb failures everytime while
submitting RX URBs. This failure might be frequent in some
low resource platforms. So, wait for a threshold failure
count before start priting the error. This change is a follow
up for the 'commit 7b368e3d15c3
("mwifiex: resubmit failed to submit RX URBs in main thread")'

Signed-off-by: Cathy Luo <c...@marvell.com>
Signed-off-by: Ganapathi Bhat <gb...@marvell.com>
---
 drivers/net/wireless/marvell/mwifiex/usb.c | 11 +++++++++--
 drivers/net/wireless/marvell/mwifiex/usb.h |  2 ++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/usb.c 
b/drivers/net/wireless/marvell/mwifiex/usb.c
index f4f2b9b..98f6973 100644
--- a/drivers/net/wireless/marvell/mwifiex/usb.c
+++ b/drivers/net/wireless/marvell/mwifiex/usb.c
@@ -300,9 +300,16 @@ static int mwifiex_usb_submit_rx_urb(struct urb_context 
*ctx, int size)
        if (card->rx_cmd_ep != ctx->ep) {
                ctx->skb = dev_alloc_skb(size);
                if (!ctx->skb) {
-                       mwifiex_dbg(adapter, ERROR,
-                                   "%s: dev_alloc_skb failed\n", __func__);
+                       if (++card->rx_urb_failure_count >
+                           MWIFIEX_RX_URB_FAILURE_THRESHOLD) {
+                               mwifiex_dbg(adapter, ERROR,
+                                           "%s: dev_alloc_skb failed, failure 
count = %u\n",
+                                           __func__,
+                                           card->rx_urb_failure_count);
+                       }
                        return -ENOMEM;
+               } else {
+                       card->rx_urb_failure_count = 0;
                }
        }
 
diff --git a/drivers/net/wireless/marvell/mwifiex/usb.h 
b/drivers/net/wireless/marvell/mwifiex/usb.h
index 37abd22..dc4750b 100644
--- a/drivers/net/wireless/marvell/mwifiex/usb.h
+++ b/drivers/net/wireless/marvell/mwifiex/usb.h
@@ -43,6 +43,7 @@
 #define MWIFIEX_TX_DATA_URB    6
 #define MWIFIEX_RX_DATA_URB    6
 #define MWIFIEX_USB_TIMEOUT    100
+#define MWIFIEX_RX_URB_FAILURE_THRESHOLD       20
 
 #define USB8766_DEFAULT_FW_NAME        "mrvl/usb8766_uapsta.bin"
 #define USB8797_DEFAULT_FW_NAME        "mrvl/usb8797_uapsta.bin"
@@ -117,6 +118,7 @@ struct usb_card_rec {
        u8 rx_cmd_interval;
        int tx_cmd_ep_type;
        u8 tx_cmd_interval;
+       u32 rx_urb_failure_count;
 };
 
 struct fw_header {
-- 
1.9.1