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Date: Fri, 27 Jan 2017 00:37:24 +0100
From: Gerd Hoffmann <kraxel@...hat.com>
To: linux-rpi-kernel@...ts.infradead.org
Cc: Stefan Wahren <stefan.wahren@...e.com>,
Eric Anholt <eric@...olt.net>,
Ulf Hansson <ulf.hansson@...aro.org>,
linux-mmc@...r.kernel.org, Gerd Hoffmann <kraxel@...hat.com>,
Florian Fainelli <f.fainelli@...il.com>,
Ray Jui <rjui@...adcom.com>,
Scott Branden <sbranden@...adcom.com>,
bcm-kernel-feedback-list@...adcom.com (maintainer:BROADCOM
BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE...),
Stephen Warren <swarren@...dotorg.org>,
Lee Jones <lee@...nel.org>,
linux-arm-kernel@...ts.infradead.org (moderated list:BROADCOM BCM2835
ARM ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 11/13] mmc: bcm2835: kill tasklet
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
drivers/mmc/host/bcm2835.c | 53 ++++++++++++----------------------------------
1 file changed, 14 insertions(+), 39 deletions(-)
diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 6a1fef3..fc2d02f 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -147,7 +147,6 @@ struct bcm2835_host {
u32 pio_timeout; /* In jiffies */
int clock; /* Current clock speed */
unsigned int max_clk; /* Max possible freq */
- struct tasklet_struct finish_tasklet; /* Tasklet structures */
struct timer_list timer; /* Timer for timeouts */
struct sg_mapping_iter sg_miter; /* SG state for PIO */
unsigned int blocks; /* remaining PIO blocks */
@@ -274,11 +273,12 @@ static void bcm2835_reset(struct mmc_host *mmc)
if (host->dma_chan)
dmaengine_terminate_sync(host->dma_chan);
- tasklet_kill(&host->finish_tasklet);
bcm2835_reset_internal(host);
}
+static void bcm2835_finish_data(struct bcm2835_host *host);
static void bcm2835_finish_command(struct bcm2835_host *host);
+static void bcm2835_finish_request(struct bcm2835_host *host);
static void bcm2835_wait_transfer_complete(struct bcm2835_host *host)
{
@@ -318,8 +318,6 @@ static void bcm2835_wait_transfer_complete(struct bcm2835_host *host)
}
}
-static void bcm2835_finish_data(struct bcm2835_host *host);
-
static void bcm2835_dma_complete(void *param)
{
struct bcm2835_host *host = param;
@@ -667,7 +665,7 @@ bool bcm2835_send_command(struct bcm2835_host *host,
dev_err(dev, "previous command never completed.\n");
bcm2835_dumpregs(host);
cmd->error = -EILSEQ;
- tasklet_schedule(&host->finish_tasklet);
+ bcm2835_finish_request(host);
return false;
}
@@ -688,7 +686,7 @@ bool bcm2835_send_command(struct bcm2835_host *host,
if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
dev_err(dev, "unsupported response type!\n");
cmd->error = -EINVAL;
- tasklet_schedule(&host->finish_tasklet);
+ bcm2835_finish_request(host);
return false;
}
@@ -746,7 +744,7 @@ static void bcm2835_transfer_complete(struct bcm2835_host *host)
}
} else {
bcm2835_wait_transfer_complete(host);
- tasklet_schedule(&host->finish_tasklet);
+ bcm2835_finish_request(host);
}
}
@@ -847,7 +845,7 @@ static void bcm2835_finish_command(struct bcm2835_host *host)
dev_err(dev, "command never completed.\n");
bcm2835_dumpregs(host);
host->cmd->error = -EIO;
- tasklet_schedule(&host->finish_tasklet);
+ bcm2835_finish_request(host);
return;
} else if (sdcmd & SDCMD_FAIL_FLAG) {
u32 sdhsts = readl(host->ioaddr + SDHSTS);
@@ -865,7 +863,7 @@ static void bcm2835_finish_command(struct bcm2835_host *host)
bcm2835_dumpregs(host);
host->cmd->error = -EILSEQ;
}
- tasklet_schedule(&host->finish_tasklet);
+ bcm2835_finish_request(host);
return;
}
}
@@ -903,12 +901,12 @@ static void bcm2835_finish_command(struct bcm2835_host *host)
}
} else if (cmd == host->mrq->stop) {
/* Finished CMD12 */
- tasklet_schedule(&host->finish_tasklet);
+ bcm2835_finish_request(host);
} else {
/* Processed actual command. */
host->cmd = NULL;
if (!host->data)
- tasklet_schedule(&host->finish_tasklet);
+ bcm2835_finish_request(host);
else if (host->data_complete)
bcm2835_transfer_complete(host);
}
@@ -935,7 +933,7 @@ static void bcm2835_timeout(unsigned long data)
host->mrq->cmd->error = -ETIMEDOUT;
dev_dbg(dev, "timeout_timer tasklet_schedule\n");
- tasklet_schedule(&host->finish_tasklet);
+ bcm2835_finish_request(host);
}
}
@@ -1244,7 +1242,7 @@ static void bcm2835_request(struct mmc_host *mmc,
edm);
bcm2835_dumpregs(host);
mrq->cmd->error = -EILSEQ;
- tasklet_schedule(&host->finish_tasklet);
+ bcm2835_finish_request(host);
mutex_unlock(&host->mutex);
return;
}
@@ -1300,21 +1298,10 @@ static void bcm2835_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
.hw_reset = bcm2835_reset,
};
-static void bcm2835_tasklet_finish(unsigned long param)
+static void bcm2835_finish_request(struct bcm2835_host *host)
{
- struct bcm2835_host *host = (struct bcm2835_host *)param;
- struct mmc_request *mrq;
struct dma_chan *terminate_chan = NULL;
-
- mutex_lock(&host->mutex);
-
- /* If this tasklet gets rescheduled while running, it will
- * be run again afterwards but without any active request.
- */
- if (!host->mrq) {
- mutex_unlock(&host->mutex);
- return;
- }
+ struct mmc_request *mrq;
del_timer(&host->timer);
@@ -1328,8 +1315,6 @@ static void bcm2835_tasklet_finish(unsigned long param)
terminate_chan = host->dma_chan;
host->dma_chan = NULL;
- mutex_unlock(&host->mutex);
-
if (terminate_chan) {
int err = dmaengine_terminate_all(terminate_chan);
@@ -1402,9 +1387,6 @@ int bcm2835_add_host(struct bcm2835_host *host)
/* report supported voltage ranges */
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
- tasklet_init(&host->finish_tasklet,
- bcm2835_tasklet_finish, (unsigned long)host);
-
setup_timer(&host->timer, bcm2835_timeout,
(unsigned long)host);
@@ -1419,7 +1401,7 @@ int bcm2835_add_host(struct bcm2835_host *host)
if (ret) {
dev_err(dev, "failed to request IRQ %d: %d\n",
host->irq, ret);
- goto untasklet;
+ return ret;
}
mmc_add_host(mmc);
@@ -1432,11 +1414,6 @@ int bcm2835_add_host(struct bcm2835_host *host)
pio_limit_string);
return 0;
-
-untasklet:
- tasklet_kill(&host->finish_tasklet);
-
- return ret;
}
static int bcm2835_probe(struct platform_device *pdev)
@@ -1548,8 +1525,6 @@ static int bcm2835_remove(struct platform_device *pdev)
del_timer_sync(&host->timer);
- tasklet_kill(&host->finish_tasklet);
-
mmc_free_host(host->mmc);
platform_set_drvdata(pdev, NULL);
--
1.8.3.1
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