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mmc: dw_mmc: make multiple instances of dw_mci_card_workqueue

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The variable 'dw_mci_card_workqueue' is a global variable shared between
multiple instances of the dw_mmc host controller. Due to this, data
corruption has been noticed when multiple instances of dw_mmc controllers
are actively reading/writing the media. Fix this by adding a instance
of 'struct workqueue_struct' for each host instance and removing the
global 'dw_mci_card_workqueue' instance.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Thomas Abraham 2012-05-01 14:57:36 -07:00 committed by Chris Ball
parent b41b6f1d1c
commit 95dcc2cb6c
2 changed files with 7 additions and 8 deletions
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14
drivers/mmc/host/dw_mmc.c
View file

@ -100,8 +100,6 @@ struct dw_mci_slot {
int last_detect_state;
};
static struct workqueue_struct *dw_mci_card_workqueue;
#if defined(CONFIG_DEBUG_FS)
static int dw_mci_req_show(struct seq_file *s, void *v)
{
@ -1605,7 +1603,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
if (pending & SDMMC_INT_CD) {
mci_writel(host, RINTSTS, SDMMC_INT_CD);
queue_work(dw_mci_card_workqueue, &host->card_work);
queue_work(host->card_workqueue, &host->card_work);
}
/* Handle SDIO Interrupts */
@ -1844,7 +1842,7 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
* Card may have been plugged in prior to boot so we
* need to run the detect tasklet
*/
queue_work(dw_mci_card_workqueue, &host->card_work);
queue_work(host->card_workqueue, &host->card_work);
return 0;
}
@ -2021,9 +2019,9 @@ int dw_mci_probe(struct dw_mci *host)
mci_writel(host, CLKSRC, 0);
tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
dw_mci_card_workqueue = alloc_workqueue("dw-mci-card",
host->card_workqueue = alloc_workqueue("dw-mci-card",
WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
if (!dw_mci_card_workqueue)
if (!host->card_workqueue)
goto err_dmaunmap;
INIT_WORK(&host->card_work, dw_mci_work_routine_card);
ret = request_irq(host->irq, dw_mci_interrupt, host->irq_flags, "dw-mci", host);
@ -2085,7 +2083,7 @@ int dw_mci_probe(struct dw_mci *host)
free_irq(host->irq, host);
err_workqueue:
destroy_workqueue(dw_mci_card_workqueue);
destroy_workqueue(host->card_workqueue);
err_dmaunmap:
if (host->use_dma && host->dma_ops->exit)
@ -2119,7 +2117,7 @@ void dw_mci_remove(struct dw_mci *host)
mci_writel(host, CLKSRC, 0);
free_irq(host->irq, host);
destroy_workqueue(dw_mci_card_workqueue);
destroy_workqueue(host->card_workqueue);
dma_free_coherent(&host->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
if (host->use_dma && host->dma_ops->exit)

1
include/linux/mmc/dw_mmc.h
View file

@ -125,6 +125,7 @@ struct dw_mci {
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
struct workqueue_struct *card_workqueue;
/* DMA interface members*/
int use_dma;