linux-kernel - [PATCH 4.8 006/138] spi: mark device nodes only in case of successful instantiation

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Date:   Wed,  9 Nov 2016 11:44:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Ralf Ramsauer <ralf@...ses-pyramidenbau.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.8 006/138] spi: mark device nodes only in case of successful instantiation

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ralf Ramsauer <ralf@...ses-pyramidenbau.de>

commit e0af98a7e025a7263ae7e50264f6f79ed29642a7 upstream.

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@...ses-pyramidenbau.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Acked-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1607,9 +1607,11 @@ static void of_register_spi_devices(stru
 		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
@@ -3120,6 +3122,7 @@ static int of_spi_notify(struct notifier
 		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;