[xburst] jz-mmc: Fix deadlock which could occur if the card was removed while a

data transfer was active.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19628 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/xburst/files-2.6.32/drivers/mmc/host/jz_mmc.c b/target/linux/xburst/files-2.6.32/drivers/mmc/host/jz_mmc.c
index e4bdde0..0f1a310 100644 (file)
--- a/target/linux/xburst/files-2.6.32/drivers/mmc/host/jz_mmc.c
+++ b/target/linux/xburst/files-2.6.32/drivers/mmc/host/jz_mmc.c
@@ -203,6 +203,7 @@ static void jz4740_mmc_write_data(struct jz4740_mmc_host *host, struct mmc_data
        struct scatterlist *sg;
        uint32_t *sg_pointer;
        int status;
+       unsigned int timeout;
        size_t i, j;
 
        for (sg = data->sg; sg; sg = sg_next(sg)) {
@@ -211,9 +212,13 @@ static void jz4740_mmc_write_data(struct jz4740_mmc_host *host, struct mmc_data
                j = i >> 3;
                i = i & 0x7;
                while (j) {
+                       timeout = 100000;
                        do {
                                status = readw(host->base + JZ_REG_MMC_IREG);
-                       } while (!(status & JZ_MMC_IRQ_TXFIFO_WR_REQ));
+                       } while (!(status & JZ_MMC_IRQ_TXFIFO_WR_REQ) && --timeout);
+                       if (timeout == 0)
+                               goto err_timeout;
+
                        writew(JZ_MMC_IRQ_TXFIFO_WR_REQ, host->base + JZ_REG_MMC_IREG);
 
                        writel(sg_pointer[0], host->base + JZ_REG_MMC_TXFIFO);
@@ -228,9 +233,13 @@ static void jz4740_mmc_write_data(struct jz4740_mmc_host *host, struct mmc_data
                        --j;
                }
                if (i) {
+                       timeout = 100000;
                        do {
                                status = readw(host->base + JZ_REG_MMC_IREG);
-                       } while (!(status & JZ_MMC_IRQ_TXFIFO_WR_REQ));
+                       } while (!(status & JZ_MMC_IRQ_TXFIFO_WR_REQ) && --timeout);
+                       if (timeout == 0)
+                               goto err_timeout;
+
                        writew(JZ_MMC_IRQ_TXFIFO_WR_REQ, host->base + JZ_REG_MMC_IREG);
 
                        while (i) {
@@ -247,12 +256,19 @@ static void jz4740_mmc_write_data(struct jz4740_mmc_host *host, struct mmc_data
                goto err;
 
        writew(JZ_MMC_IRQ_TXFIFO_WR_REQ, host->base + JZ_REG_MMC_IREG);
+       timeout = 100000;
        do {
                status = readl(host->base + JZ_REG_MMC_STATUS);
-       } while ((status & JZ_MMC_STATUS_DATA_TRAN_DONE) == 0);
+       } while ((status & JZ_MMC_STATUS_DATA_TRAN_DONE) == 0 && --timeout);
+       if (timeout == 0)
+               goto err_timeout;
        writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG);
 
        return;
+err_timeout:
+       host->req->cmd->error = -ETIMEDOUT;
+       data->error = -ETIMEDOUT;
+       return;
 err:
        if(status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
                host->req->cmd->error = -ETIMEDOUT;
@@ -288,6 +304,7 @@ static void jz4740_mmc_read_data(struct jz4740_mmc_host *host, struct mmc_data *
        uint32_t d;
        uint16_t status = 0;
        size_t i, j;
+       unsigned int timeout;
 
        for (sg = data->sg; sg; sg = sg_next(sg)) {
                sg_pointer = sg_virt(sg);
@@ -295,9 +312,14 @@ static void jz4740_mmc_read_data(struct jz4740_mmc_host *host, struct mmc_data *
                j = i >> 5;
                i = i & 0x1f;
                while (j) {
+                       timeout = 100000;
                        do {
                                status = readw(host->base + JZ_REG_MMC_IREG);
-                       } while (!(status & JZ_MMC_IRQ_RXFIFO_RD_REQ));
+                       } while (!(status & JZ_MMC_IRQ_RXFIFO_RD_REQ) && --timeout);
+
+                       if (unlikely(timeout == 0))
+                               goto err_timeout;
+
                        writew(JZ_MMC_IRQ_RXFIFO_RD_REQ, host->base + JZ_REG_MMC_IREG);
 
                        sg_pointer[0] = readl(host->base + JZ_REG_MMC_RXFIFO);
@@ -314,9 +336,13 @@ static void jz4740_mmc_read_data(struct jz4740_mmc_host *host, struct mmc_data *
                }
 
                while (i >= 4) {
+                       timeout = 100000;
                        do {
                                status = readl(host->base + JZ_REG_MMC_STATUS);
-                       } while ((status & JZ_MMC_STATUS_DATA_FIFO_EMPTY));
+                       } while ((status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout);
+
+                       if (unlikely(timeout == 0))
+                               goto err_timeout;
 
                        *sg_pointer = readl(host->base + JZ_REG_MMC_RXFIFO);
                        ++sg_pointer;
@@ -337,12 +363,15 @@ static void jz4740_mmc_read_data(struct jz4740_mmc_host *host, struct mmc_data *
 
        /* For whatever reason there is sometime one word more in the fifo then
         * requested */
-       while ((status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) == 0) {
+       while ((status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) == 0 && --timeout) {
                d = readl(host->base + JZ_REG_MMC_RXFIFO);
                status = readl(host->base + JZ_REG_MMC_STATUS);
        }
        return;
-
+err_timeout:
+       host->req->cmd->error = -ETIMEDOUT;
+       data->error = -ETIMEDOUT;
+       return;
 err:
        if(status & JZ_MMC_STATUS_TIMEOUT_READ) {
                host->req->cmd->error = -ETIMEDOUT;
@@ -375,9 +404,17 @@ static irqreturn_t jz_mmc_irq(int irq, void *devid)
        irq_reg = readw(host->base + JZ_REG_MMC_IREG);
 
        tmp = irq_reg;
-       spin_lock(&host->lock);
+       spin_lock_irqsave(&host->lock, flags);
        irq_reg &= ~host->irq_mask;
-       spin_unlock(&host->lock);
+       spin_unlock_irqrestore(&host->lock, flags);
+
+       tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
+                       JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
+
+       if (tmp != irq_reg) {
+               dev_warn(&host->pdev->dev, "Sparse irq: %x\n", tmp & ~irq_reg);
+               writew(tmp & ~irq_reg, host->base + JZ_REG_MMC_IREG);
+       }
 
        if (irq_reg & JZ_MMC_IRQ_SDIO) {
                writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG);
@@ -394,6 +431,7 @@ static irqreturn_t jz_mmc_irq(int irq, void *devid)
                spin_unlock_irqrestore(&host->lock, flags);
                goto handled;
        }
+
        host->waiting = 0;
        spin_unlock_irqrestore(&host->lock, flags);
 
@@ -513,6 +551,7 @@ static void jz4740_mmc_cmd_done(struct jz4740_mmc_host *host)
        uint32_t status;
        struct mmc_command *cmd = host->req->cmd;
        struct mmc_request *req = host->req;
+       unsigned int timeout = 100000;
        status = readl(host->base + JZ_REG_MMC_STATUS);
 
        if (cmd->flags & MMC_RSP_PRESENT)
@@ -529,10 +568,13 @@ static void jz4740_mmc_cmd_done(struct jz4740_mmc_host *host)
                jz4740_mmc_send_command(host, req->stop);
                do {
                        status = readl(host->base + JZ_REG_MMC_STATUS);
-               } while ((status & JZ_MMC_STATUS_PRG_DONE) == 0);
+               } while ((status & JZ_MMC_STATUS_PRG_DONE) == 0 && --timeout);
                writew(JZ_MMC_IRQ_PRG_DONE, host->base + JZ_REG_MMC_IREG);
        }
 
+       if (timeout == 0)
+               req->stop->error = -ETIMEDOUT;
+
        jz4740_mmc_request_done(host);
 }
 
@@ -558,6 +600,7 @@ static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 
        switch(ios->power_mode) {
        case MMC_POWER_UP:
+               jz4740_mmc_reset(host);
                if (gpio_is_valid(host->pdata->gpio_power))
                        gpio_set_value(host->pdata->gpio_power,
                                        !host->pdata->power_active_low);