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spi: mark device nodes only in case of successful instantiation

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Instantiated SPI device nodes are marked with OF_POPULATE. This was
introduced in bd6c164. On unloading, loaded device nodes will of course
be unmarked. The problem are nodes that fail during initialisation: If a
node fails, it won't be unloaded and hence not be unmarked.

If a SPI driver module is unloaded and reloaded, it will skip nodes that
failed before.

Skip device nodes that are already populated and mark them only in case
of success.

Note that the same issue exists for I2C.

Fixes: bd6c164 ("spi: Mark instantiated device nodes with OF_POPULATE")
Signed-off-by: Ralf Ramsauer <ralf@ramses-pyramidenbau.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Ralf Ramsauer 2016-10-17 15:59:56 +02:00 committed by Mark Brown
parent 1001354ca3
commit e0af98a7e0
1 changed files with 4 additions and 1 deletions
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5
drivers/spi/spi.c
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@ -1618,9 +1618,11 @@ static void of_register_spi_devices(struct spi_master *master)
if (of_node_test_and_set_flag(nc, OF_POPULATED))
continue;
spi = of_register_spi_device(master, nc);
if (IS_ERR(spi))
if (IS_ERR(spi)) {
dev_warn(&master->dev, "Failed to create SPI device for %s\n",
nc->full_name);
of_node_clear_flag(nc, OF_POPULATED);
}
}
}
#else
@ -3131,6 +3133,7 @@ static int of_spi_notify(struct notifier_block *nb, unsigned long action,
if (IS_ERR(spi)) {
pr_err("%s: failed to create for '%s'\n",
__func__, rd->dn->full_name);
of_node_clear_flag(rd->dn, OF_POPULATED);
return notifier_from_errno(PTR_ERR(spi));
}
break;