> From: Wei-Ning Huang [mailto:wnhu...@chromium.org] > Sent: Friday, May 27, 2016 5:58 PM > To: Linux-Wireless > Cc: LKML; Amitkumar Karwar; djku...@chromium.org; Wei-Ning Huang > Subject: [PATCH v2] mwifiex: fix race condition when downloading > firmware > > The action 'check for winner' and 'download firmware' should be an > atomic action. This is true for btmrvl driver but not mwmfiex, which > cause firmware download to fail when the following scenario happens: > > 1) mwifiex check winner status: true > 2) btmrvl check winner status: true, and start downloading firmware > 3) mwifiex tries to download firmware, but failed because btmrvl is > already downloading. > > This won't happen if 1) and 3) is an atomic action. This patch adds > sdio_claim/release_host call around those two actions to make sure it's > atomic. > > Signed-off-by: Wei-Ning Huang <wnhu...@chromium.org> > --- > drivers/net/wireless/marvell/mwifiex/init.c | 14 +++++++++++--- > 1 file changed, 11 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/wireless/marvell/mwifiex/init.c > b/drivers/net/wireless/marvell/mwifiex/init.c > index 78c532f..7703438 100644 > --- a/drivers/net/wireless/marvell/mwifiex/init.c > +++ b/drivers/net/wireless/marvell/mwifiex/init.c > @@ -24,6 +24,7 @@ > #include "main.h" > #include "wmm.h" > #include "11n.h" > +#include "sdio.h" > > /* > * This function adds a BSS priority table to the table list. > @@ -737,16 +738,20 @@ mwifiex_shutdown_drv(struct mwifiex_adapter > *adapter) int mwifiex_dnld_fw(struct mwifiex_adapter *adapter, > struct mwifiex_fw_image *pmfw) > { > + struct sdio_mmc_card *card = adapter->card; > int ret; > u32 poll_num = 1; > > + if (adapter->iface_type == MWIFIEX_SDIO) > + sdio_claim_host(card->func); > + > if (adapter->if_ops.check_fw_status) { > /* check if firmware is already running */ > ret = adapter->if_ops.check_fw_status(adapter, poll_num); > if (!ret) { > mwifiex_dbg(adapter, MSG, > "WLAN FW already running! Skip FW dnld\n"); > - return 0; > + goto release_host; > } > } > > @@ -759,7 +764,7 @@ int mwifiex_dnld_fw(struct mwifiex_adapter *adapter, > if (ret) { > mwifiex_dbg(adapter, MSG, > "WLAN read winner status failed!\n"); > - return ret; > + goto release_host; > } > > if (!adapter->winner) { > @@ -775,7 +780,7 @@ int mwifiex_dnld_fw(struct mwifiex_adapter *adapter, > if (ret) { > mwifiex_dbg(adapter, ERROR, > "prog_fw failed ret=%#x\n", ret); > - return ret; > + goto release_host; > } > } > > @@ -785,6 +790,9 @@ poll_fw: > if (ret) > mwifiex_dbg(adapter, ERROR, > "FW failed to be active in time\n"); > +release_host: > + if (adapter->iface_type == MWIFIEX_SDIO) > + sdio_release_host(card->func); > > return ret; > } > -- > 2.1.2
Patch looks fine to me. Acked-by: Amitkumar Karwar <akar...@marvell.com> Regards, Amitkumar
