[RFC PATCH 1/3] mmc: sdio: Don't use abort-able claim host method from SDIO IRQ thread
From: Ulf Hansson <hidden>
Date: 2017-05-11 12:39:00
Also in:
linux-mmc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
In a step to simplify the use of the lock, mmc_claim|release_host(), let's change the SDIO IRQ thread to move away from using the abort-able claim host method. In the SDIO IRQ thread case, we can instead check the numbers of SDIO IRQs that are currently claimed via host->sdio_irqs, as this field is protected from updates unless the host is claimed. When host->sdio_irqs has become zero, it means the SDIO func driver(s) has released the SDIO IRQ, then we can bail out and stop running the SDIO IRQ thread. Signed-off-by: Ulf Hansson <redacted> --- drivers/mmc/core/sdio_irq.c | 10 ++++++---- include/linux/mmc/host.h | 1 - 2 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
index 6d4b720..95f7a09 100644
--- a/drivers/mmc/core/sdio_irq.c
+++ b/drivers/mmc/core/sdio_irq.c@@ -137,9 +137,13 @@ static int sdio_irq_thread(void *_host) * holding of the host lock does not cover too much work * that doesn't require that lock to be held. */ - ret = __mmc_claim_host(host, &host->sdio_irq_thread_abort); - if (ret) + mmc_claim_host(host); + if (!host->sdio_irqs) { + ret = 1; + mmc_release_host(host); break; + } + ret = process_sdio_pending_irqs(host); host->sdio_irq_pending = false; mmc_release_host(host);
@@ -195,7 +199,6 @@ static int sdio_card_irq_get(struct mmc_card *card) if (!host->sdio_irqs++) { if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) { - atomic_set(&host->sdio_irq_thread_abort, 0); host->sdio_irq_thread = kthread_run(sdio_irq_thread, host, "ksdioirqd/%s", mmc_hostname(host));
@@ -223,7 +226,6 @@ static int sdio_card_irq_put(struct mmc_card *card) if (!--host->sdio_irqs) { if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) { - atomic_set(&host->sdio_irq_thread_abort, 1); kthread_stop(host->sdio_irq_thread); } else if (host->caps & MMC_CAP_SDIO_IRQ) { host->ops->enable_sdio_irq(host, 0);
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 21385ac..8a4131f 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h@@ -359,7 +359,6 @@ struct mmc_host { unsigned int sdio_irqs; struct task_struct *sdio_irq_thread; bool sdio_irq_pending; - atomic_t sdio_irq_thread_abort; mmc_pm_flag_t pm_flags; /* requested pm features */
--
2.7.4