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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
drivers/mmc/host/sdhci-of-core.c
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@@ -124,8 +124,10 @@ static bool __devinit sdhci_of_wp_inverted(struct device_node *np)
#endif
}
static const struct of_device_id sdhci_of_match[];
static int __devinit sdhci_of_probe(struct platform_device *ofdev)
{
const struct of_device_id *match;
struct device_node *np = ofdev->dev.of_node;
struct sdhci_of_data *sdhci_of_data;
struct sdhci_host *host;
@@ -134,9 +136,10 @@ static int __devinit sdhci_of_probe(struct platform_device *ofdev)
int size;
int ret;
if (!ofdev->dev.of_match)
match = of_match_device(sdhci_of_match, &ofdev->dev);
if (!match)
return -EINVAL;
sdhci_of_data = ofdev->dev.of_match->data;
sdhci_of_data = match->data;
if (!of_device_is_available(np))
return -ENODEV;