From 3768c74b3a969b62894667e4b79dd50f58a91ecb Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Pouiller?= Date: Mon, 7 Sep 2020 12:15:20 +0200 Subject: [PATCH] staging: wfx: drop async field from struct hif_cmd MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The parameter "async" in wfx_cmd_send() allows to send command without waiting for the reply. In this case, the mutex hif_cmd.lock is released asynchronously in the context of the receiver workqueue. However, "kbuild test robot" complains about this architecture[1] since it is not able to follow the lock duration of hif_cmd.lock (and indeed, the state of the driver if the hardware wouldn't reply is not well defined). Besides, this feature is not really necessary. It is only used by hif_shutdown(). This function hijack the 'async' flag to run a command that won't answer. So, this patch removes the 'async' flag and introduces a 'no_reply' flag. Thus, the mutex hif_cmd.lock is only acquired/released from hif_cmd_send(). Therefore: - hif_shutdown() does not have to touch the private data of the struct hif_cmd - Kbuild test robot should be happy - the resulting code is simpler [1] https://lore.kernel.org/driverdev-devel/alpine.DEB.2.21.1910041317381.2992@hadrien/ Reported-by: kbuild test robot Reported-by: Julia Lawall Signed-off-by: Jérôme Pouiller Link: https://lore.kernel.org/r/20200907101521.66082-31-Jerome.Pouiller@silabs.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/wfx/hif_rx.c | 7 +------ drivers/staging/wfx/hif_tx.c | 24 +++++++++--------------- drivers/staging/wfx/hif_tx.h | 1 - 3 files changed, 10 insertions(+), 22 deletions(-) diff --git a/drivers/staging/wfx/hif_rx.c b/drivers/staging/wfx/hif_rx.c index 6950b3e9d7cf..b40af86356f1 100644 --- a/drivers/staging/wfx/hif_rx.c +++ b/drivers/staging/wfx/hif_rx.c @@ -47,12 +47,7 @@ static int hif_generic_confirm(struct wfx_dev *wdev, } wdev->hif_cmd.ret = status; - if (!wdev->hif_cmd.async) { - complete(&wdev->hif_cmd.done); - } else { - wdev->hif_cmd.buf_send = NULL; - mutex_unlock(&wdev->hif_cmd.lock); - } + complete(&wdev->hif_cmd.done); return status; } diff --git a/drivers/staging/wfx/hif_tx.c b/drivers/staging/wfx/hif_tx.c index a75c6b9804ba..1bd7f773209c 100644 --- a/drivers/staging/wfx/hif_tx.c +++ b/drivers/staging/wfx/hif_tx.c @@ -47,7 +47,7 @@ static void *wfx_alloc_hif(size_t body_len, struct hif_msg **hif) } int wfx_cmd_send(struct wfx_dev *wdev, struct hif_msg *request, - void *reply, size_t reply_len, bool async) + void *reply, size_t reply_len, bool no_reply) { const char *mib_name = ""; const char *mib_sep = ""; @@ -55,8 +55,6 @@ int wfx_cmd_send(struct wfx_dev *wdev, struct hif_msg *request, int vif = request->interface; int ret; - WARN(wdev->hif_cmd.buf_recv && wdev->hif_cmd.async, "API usage error"); - // Do not wait for any reply if chip is frozen if (wdev->chip_frozen) return -ETIMEDOUT; @@ -69,14 +67,18 @@ int wfx_cmd_send(struct wfx_dev *wdev, struct hif_msg *request, wdev->hif_cmd.buf_send = request; wdev->hif_cmd.buf_recv = reply; wdev->hif_cmd.len_recv = reply_len; - wdev->hif_cmd.async = async; complete(&wdev->hif_cmd.ready); wfx_bh_request_tx(wdev); - // NOTE: no timeout is caught async is enabled - if (async) + if (no_reply) { + // Chip won't reply. Give enough time to the wq to send the + // buffer. + msleep(100); + wdev->hif_cmd.buf_send = NULL; + mutex_unlock(&wdev->hif_cmd.lock); return 0; + } if (wdev->poll_irq) wfx_bh_poll_irq(wdev); @@ -118,29 +120,21 @@ int wfx_cmd_send(struct wfx_dev *wdev, struct hif_msg *request, } // This function is special. After HIF_REQ_ID_SHUT_DOWN, chip won't reply to any -// request anymore. We need to slightly hack struct wfx_hif_cmd for that job. Be -// careful to only call this function during device unregister. +// request anymore. Obviously, only call this function during device unregister. int hif_shutdown(struct wfx_dev *wdev) { int ret; struct hif_msg *hif; - if (wdev->chip_frozen) - return 0; wfx_alloc_hif(0, &hif); if (!hif) return -ENOMEM; wfx_fill_header(hif, -1, HIF_REQ_ID_SHUT_DOWN, 0); ret = wfx_cmd_send(wdev, hif, NULL, 0, true); - // After this command, chip won't reply. Be sure to give enough time to - // bh to send buffer: - msleep(100); - wdev->hif_cmd.buf_send = NULL; if (wdev->pdata.gpio_wakeup) gpiod_set_value(wdev->pdata.gpio_wakeup, 0); else control_reg_write(wdev, 0); - mutex_unlock(&wdev->hif_cmd.lock); kfree(hif); return ret; } diff --git a/drivers/staging/wfx/hif_tx.h b/drivers/staging/wfx/hif_tx.h index e8aca39e7497..960d5f2fa41c 100644 --- a/drivers/staging/wfx/hif_tx.h +++ b/drivers/staging/wfx/hif_tx.h @@ -22,7 +22,6 @@ struct wfx_hif_cmd { struct mutex lock; struct completion ready; struct completion done; - bool async; struct hif_msg *buf_send; void *buf_recv; size_t len_recv;