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w1: fix data abort if no one wire bus master present

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When the "w1 bus" command is used with no bus master present
a data abort may occur.

This is because uclass_first_device() returns zero, but sets the output
struct udevice pointer to NULL in the no device found case.

Fix w1_get_bus() to account for this and return an error code
as is expected by the callers.

Signed-off-by: Martin Fuzzey <martin.fuzzey@flowbird.group>
Reviewed-by: Eugen Hristev <eugen.hristev@microchip.com>
This commit is contained in:
Martin Fuzzey 2018-10-22 18:31:08 +02:00 • committed by Tom Rini
parent 586d4b010e
commit 65b60897a7
1 changed files with 8 additions and 6 deletions
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14
drivers/w1/w1-uclass.c
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@ -115,17 +115,19 @@ int w1_get_bus(int busnum, struct udevice **busp)
struct udevice *dev; struct udevice *dev;
for (ret = uclass_first_device(UCLASS_W1, &dev); for (ret = uclass_first_device(UCLASS_W1, &dev);
!ret; dev && !ret;
uclass_next_device(&dev), i++) { ret = uclass_next_device(&dev), i++) {
if (ret) {
debug("Cannot find w1 bus %d\n", busnum);
return ret;
}
if (i == busnum) { if (i == busnum) {
*busp = dev; *busp = dev;
return 0; return 0;
} }
} }
if (!ret) {
debug("Cannot find w1 bus %d\n", busnum);
ret = -ENODEV;
}
return ret; return ret;
} }