[PATCH] mmc: fix MMIO vs memory races in sdhci

Sprinkle some mmiowb() where needed (writeX() before unlock()).

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 4dab5ec..9ff9231 100644 (file)
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -717,6 +717,7 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
        } else
                sdhci_send_command(host, mrq->cmd);
 
+       mmiowb();
        spin_unlock_irqrestore(&host->lock, flags);
 }
 
@@ -753,6 +754,7 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                ctrl &= ~SDHCI_CTRL_4BITBUS;
        writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 
+       mmiowb();
        spin_unlock_irqrestore(&host->lock, flags);
 }
 
@@ -860,6 +862,7 @@ static void sdhci_tasklet_finish(unsigned long param)
 
        sdhci_deactivate_led(host);
 
+       mmiowb();
        spin_unlock_irqrestore(&host->lock, flags);
 
        mmc_request_done(host->mmc, mrq);
@@ -893,6 +896,7 @@ static void sdhci_timeout_timer(unsigned long data)
                }
        }
 
+       mmiowb();
        spin_unlock_irqrestore(&host->lock, flags);
 }
 
@@ -1030,6 +1034,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id, struct pt_regs *regs)
 
        result = IRQ_HANDLED;
 
+       mmiowb();
 out:
        spin_unlock(&host->lock);
 
@@ -1095,6 +1100,7 @@ static int sdhci_resume (struct pci_dev *pdev)
                if (chip->hosts[i]->flags & SDHCI_USE_DMA)
                        pci_set_master(pdev);
                sdhci_init(chip->hosts[i]);
+               mmiowb();
                ret = mmc_resume_host(chip->hosts[i]->mmc);
                if (ret)
                        return ret;
@@ -1327,6 +1333,8 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
        host->chip = chip;
        chip->hosts[slot] = host;
 
+       mmiowb();
+
        mmc_add_host(mmc);
 
        printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n", mmc_hostname(mmc),