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[PATCH] mmc: fix MMIO vs memory races in sdhci
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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>
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Pierre Ossman authored and Linus Torvalds committed Oct 4, 2006
1 parent f956512 commit 5f25a66
Showing 1 changed file with 8 additions and 0 deletions.
8 changes: 8 additions & 0 deletions drivers/mmc/sdhci.c
Original file line number Diff line number Diff line change
Expand Up @@ -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);
}

Expand Down Expand Up @@ -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);
}

Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -893,6 +896,7 @@ static void sdhci_timeout_timer(unsigned long data)
}
}

mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
}

Expand Down Expand Up @@ -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);

Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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),
Expand Down

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