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mwifiex: fix out of memory issue observed for USB chipsets 

On some platforms, system goes out of memory during heavy
Rx traffic with our USB chipsets.

In case of SDIO/PCIe, after receiving 50 packets in Rx queue
we stop processing interrupts till packets pending fall below
low threshold i.e 20. We don't have similar logic for USB,
so if host platform is slow, we would hit a case where firmware
keeps on pushing packets at high speed than driver/kernel can
process.

We will stop submitting URBs for Rx data when pending packet
count reaches high threshold and restart them when enough
packets are consumed to solve the problem.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=85071
Reported-by: Marek Belisko <marek.belisko@gmail.com>
Tested-by: Marek Belisko <marek.belisko@gmail.com>
Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Amitkumar Karwar 2014-11-05 17:04:29 +05:30 committed by John W. Linville
parent 041bfab5bb
commit cf6a64fd60
3 changed files with 25 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/mwifiex/main.c
View File

@ -146,6 +146,8 @@ static int mwifiex_process_rx(struct mwifiex_adapter *adapter)
atomic_dec(&adapter->rx_pending);
if (adapter->delay_main_work &&
(atomic_read(&adapter->rx_pending) < LOW_RX_PENDING)) {
if (adapter->if_ops.submit_rem_rx_urbs)
adapter->if_ops.submit_rem_rx_urbs(adapter);
adapter->delay_main_work = false;
queue_work(adapter->workqueue, &adapter->main_work);
}

1
drivers/net/wireless/mwifiex/main.h
View File

@ -692,6 +692,7 @@ struct mwifiex_if_ops {
void (*fw_dump)(struct mwifiex_adapter *);
int (*clean_pcie_ring) (struct mwifiex_adapter *adapter);
void (*iface_work)(struct work_struct *work);
void (*submit_rem_rx_urbs)(struct mwifiex_adapter *adapter);
};
struct mwifiex_adapter {

23
drivers/net/wireless/mwifiex/usb.c
View File

@ -222,7 +222,13 @@ static void mwifiex_usb_rx_complete(struct urb *urb)
else
size = MWIFIEX_RX_DATA_BUF_SIZE;
mwifiex_usb_submit_rx_urb(context, size);
if (card->rx_cmd_ep == context->ep) {
mwifiex_usb_submit_rx_urb(context, size);
} else {
context->skb = NULL;
if (atomic_read(&adapter->rx_pending) <= HIGH_RX_PENDING)
mwifiex_usb_submit_rx_urb(context, size);
}
return;
}
@ -978,6 +984,20 @@ static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter)
return 0;
}
static void mwifiex_usb_submit_rem_rx_urbs(struct mwifiex_adapter *adapter)
{
struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;
int i;
struct urb_context *ctx;
for (i = 0; i < MWIFIEX_RX_DATA_URB; i++) {
if (card->rx_data_list[i].skb)
continue;
ctx = &card->rx_data_list[i];
mwifiex_usb_submit_rx_urb(ctx, MWIFIEX_RX_DATA_BUF_SIZE);
}
}
static struct mwifiex_if_ops usb_ops = {
.register_dev = mwifiex_register_dev,
.unregister_dev = mwifiex_unregister_dev,
@ -989,6 +1009,7 @@ static struct mwifiex_if_ops usb_ops = {
.cmdrsp_complete = mwifiex_usb_cmd_event_complete,
.event_complete = mwifiex_usb_cmd_event_complete,
.host_to_card = mwifiex_usb_host_to_card,
.submit_rem_rx_urbs = mwifiex_usb_submit_rem_rx_urbs,
};
/* This function initializes the USB driver module.