From e8593a8abf8cc35073b1c26bb0492f7e361b6ac1 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Tue, 31 May 2016 12:56:18 +0200 Subject: [PATCH] staging: ks7010: avoid workqueue races My Spectec SDW823 card oopsed when it was already inserted during boot. When debugging this, I noticed that the card init was done in a seperate workqueue which was only activated once in probe. After removing the workqueue and calling the card init directly from probe, the OOPS went away. It turned out this is the same OOPS which happened when removing the card, so this seems possible now. Note: There is still a not-understood card-removed event during boot, but at least it doesn't crash anymore and the card will be re-probed right away. Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- drivers/staging/ks7010/TODO | 1 - drivers/staging/ks7010/ks7010_sdio.c | 28 ++-------------------------- drivers/staging/ks7010/ks7010_sdio.h | 2 -- 3 files changed, 2 insertions(+), 29 deletions(-) diff --git a/drivers/staging/ks7010/TODO b/drivers/staging/ks7010/TODO index 390e821efc0b..5cbb4ca99974 100644 --- a/drivers/staging/ks7010/TODO +++ b/drivers/staging/ks7010/TODO @@ -28,7 +28,6 @@ Now the TODOs: should understand the change you submit. - drop using a config file and use an upstream technique for configuration - fix the 'card removal' event when card is inserted when booting -- driver crashes when removing the card - check what other upstream wireless mechanisms can be used instead of the custom ones here diff --git a/drivers/staging/ks7010/ks7010_sdio.c b/drivers/staging/ks7010/ks7010_sdio.c index 9300658c4aed..5b78522fad1e 100644 --- a/drivers/staging/ks7010/ks7010_sdio.c +++ b/drivers/staging/ks7010/ks7010_sdio.c @@ -817,14 +817,8 @@ static int ks79xx_upload_firmware(ks_wlan_private *priv, struct ks_sdio_card *ca return rc; } -static void card_init_task(struct work_struct *work) +static void ks7010_card_init(struct ks_wlan_private *priv) { - struct hw_info_t *hw; - struct ks_wlan_private *priv; - - hw = container_of(work, struct hw_info_t, init_task); - priv = container_of(hw, struct ks_wlan_private, ks_wlan_hw); - DPRINTK(5,"\ncard_init_task()\n"); /* init_waitqueue_head(&priv->confirm_wait); */ @@ -1052,23 +1046,11 @@ static int ks7910_sdio_probe(struct sdio_func *func, const struct sdio_device_id goto error_free_read_buf; } - priv->ks_wlan_hw.ks7010sdio_init = create_singlethread_workqueue("ks7010sdio_init"); - if(!priv->ks_wlan_hw.ks7010sdio_init){ - DPRINTK(1, "create_workqueue failed !!\n"); - goto error_free_sdio_wq; - } - - INIT_WORK(&priv->ks_wlan_hw.init_task, card_init_task); INIT_DELAYED_WORK(&priv->ks_wlan_hw.rw_wq, ks7010_rw_function); - - queue_work(priv->ks_wlan_hw.ks7010sdio_init, &priv->ks_wlan_hw.init_task); + ks7010_card_init(priv); return 0; -error_free_sdio_wq: - flush_workqueue(priv->ks_wlan_hw.ks7010sdio_wq); - destroy_workqueue(priv->ks_wlan_hw.ks7010sdio_wq); - priv->ks_wlan_hw.ks7010sdio_wq = NULL; error_free_read_buf: kfree(priv->ks_wlan_hw.read_buf); priv->ks_wlan_hw.read_buf = NULL; @@ -1139,12 +1121,6 @@ static void ks7910_sdio_remove(struct sdio_func *func) } DPRINTK(1, "destroy_workqueue(priv->ks_wlan_hw.ks7010sdio_wq);\n"); - if(priv->ks_wlan_hw.ks7010sdio_init){ - flush_workqueue(priv->ks_wlan_hw.ks7010sdio_init); - destroy_workqueue(priv->ks_wlan_hw.ks7010sdio_init); - } - DPRINTK(1, "destroy_workqueue(priv->ks_wlan_hw.ks7010sdio_init);\n"); - hostif_exit(priv); DPRINTK(1, "hostif_exit\n"); diff --git a/drivers/staging/ks7010/ks7010_sdio.h b/drivers/staging/ks7010/ks7010_sdio.h index 5bf01abbf2ab..93823837f19e 100644 --- a/drivers/staging/ks7010/ks7010_sdio.h +++ b/drivers/staging/ks7010/ks7010_sdio.h @@ -96,8 +96,6 @@ struct hw_info_t { struct ks_sdio_card *sdio_card; struct completion ks7010_sdio_wait; struct workqueue_struct *ks7010sdio_wq; - struct workqueue_struct *ks7010sdio_init; - struct work_struct init_task; struct delayed_work rw_wq; unsigned char *read_buf; struct tasklet_struct rx_bh_task; -- 2.20.1