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| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2012-04-16 19:16:54 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-01 15:13:00 +0800 |
| commit | 0d7755e450865b76b98e3fea2e166b0a2266972d (patch) | |
| tree | f8cd534b07f01aaf1e990ab3ca336c1f75adb46c /drivers/mmc | |
| parent | 1c4f53ca32463a742583976f40444ce4485f3cf9 (diff) | |
| download | kernel_samsung_smdk4412-0d7755e450865b76b98e3fea2e166b0a2266972d.zip kernel_samsung_smdk4412-0d7755e450865b76b98e3fea2e166b0a2266972d.tar.gz kernel_samsung_smdk4412-0d7755e450865b76b98e3fea2e166b0a2266972d.tar.bz2 | |
mmc: sdio: avoid spurious calls to interrupt handlers
commit bbbc4c4d8c5face097d695f9bf3a39647ba6b7e7 upstream.
Commit 06e8935feb ("optimized SDIO IRQ handling for single irq")
introduced some spurious calls to SDIO function interrupt handlers,
such as when the SDIO IRQ thread is started, or the safety check
performed upon a system resume. Let's add a flag to perform the
optimization only when a real interrupt is signaled by the host
driver and we know there is no point confirming it.
Reported-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/sdio.c | 2 | ||||
| -rw-r--r-- | drivers/mmc/core/sdio_irq.c | 11 |
2 files changed, 8 insertions, 5 deletions
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index ac492ac..9b18b54 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -665,7 +665,7 @@ static int mmc_sdio_resume(struct mmc_host *host) } if (!err && host->sdio_irqs) - mmc_signal_sdio_irq(host); + wake_up_process(host->sdio_irq_thread); mmc_release_host(host); /* diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c index 03ead02..d58ae91 100644 --- a/drivers/mmc/core/sdio_irq.c +++ b/drivers/mmc/core/sdio_irq.c @@ -27,18 +27,20 @@ #include "sdio_ops.h" -static int process_sdio_pending_irqs(struct mmc_card *card) +static int process_sdio_pending_irqs(struct mmc_host *host) { + struct mmc_card *card = host->card; int i, ret, count; unsigned char pending; struct sdio_func *func; /* * Optimization, if there is only 1 function interrupt registered - * call irq handler directly + * and we know an IRQ was signaled then call irq handler directly. + * Otherwise do the full probe. */ func = card->sdio_single_irq; - if (func) { + if (func && host->sdio_irq_pending) { func->irq_handler(func); return 1; } @@ -115,7 +117,8 @@ static int sdio_irq_thread(void *_host) ret = __mmc_claim_host(host, &host->sdio_irq_thread_abort); if (ret) break; - ret = process_sdio_pending_irqs(host->card); + ret = process_sdio_pending_irqs(host); + host->sdio_irq_pending = false; mmc_release_host(host); /* |