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drivercore: revert addition of of_match to struct device

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Commit b826291c, "drivercore/dt: add a match table pointer to struct
device" added an of_match pointer to struct device to cache the
of_match_table entry discovered at driver match time.  This was unsafe
because matching is not an atomic operation with probing a driver.  If
two or more drivers are attempted to be matched to a driver at the
same time, then the cached matching entry pointer could get
overwritten.

This patch reverts the of_match cache pointer and reworks all users to
call of_match_device() directly instead.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely
2011-05-18 11:19:24 -06:00
parent 01294d8262
commit b1608d69cb
22 changed files with 108 additions and 50 deletions
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7
arch/powerpc/sysdev/fsl_msi.c
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@@ -304,8 +304,10 @@ static int __devinit fsl_msi_setup_hwirq(struct fsl_msi *msi,
return 0;
}
static const struct of_device_id fsl_of_msi_ids[];
static int __devinit fsl_of_msi_probe(struct platform_device *dev)
{
const struct of_device_id *match;
struct fsl_msi *msi;
struct resource res;
int err, i, j, irq_index, count;
@@ -316,9 +318,10 @@ static int __devinit fsl_of_msi_probe(struct platform_device *dev)
u32 offset;
static const u32 all_avail[] = { 0, NR_MSI_IRQS };
if (!dev->dev.of_match)
match = of_match_device(fsl_of_msi_ids, &dev->dev);
if (!match)
return -EINVAL;
features = dev->dev.of_match->data;
features = match->data;
printk(KERN_DEBUG "Setting up Freescale MSI support\n");