mwifiex: process pcie io memory read failure case

It is observed that ioread32 may fail to read pcie register
in certain scenarios, this patch handles these cases.

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
index 918e04954afec14c10e161f524dd0f7fcf151e4f..b9fe1813cc4febeb446b0a543e3ef52f9706d714 100644 (file)
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -323,6 +323,8 @@ static int mwifiex_read_reg(struct mwifiex_adapter *adapter, int reg, u32 *data)
        struct pcie_service_card *card = adapter->card;
 
        *data = ioread32(card->pci_mmap1 + reg);
+       if (*data == 0xffffffff)
+               return 0xffffffff;
 
        return 0;
 }