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From: Arnd Bergmann <arnd@arndb.de>
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Date: Wed, 17 Apr 2019 18:29:13 +0200
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Subject: s390: ctcm: fix ctcm_new_device error return code
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Git-commit: 27b141fc234a3670d21bd742c35d7205d03cbb3a
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Patch-mainline: v5.1-rc7
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References: git-fixes bsc#1211361
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clang points out that the return code from this function is
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undefined for one of the error paths:
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../drivers/s390/net/ctcm_main.c:1595:7: warning: variable 'result' is used uninitialized whenever 'if' condition is true
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[-Wsometimes-uninitialized]
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if (priv->channel[direction] == NULL) {
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^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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../drivers/s390/net/ctcm_main.c:1638:9: note: uninitialized use occurs here
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return result;
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^~~~~~
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../drivers/s390/net/ctcm_main.c:1595:3: note: remove the 'if' if its condition is always false
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if (priv->channel[direction] == NULL) {
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^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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../drivers/s390/net/ctcm_main.c:1539:12: note: initialize the variable 'result' to silence this warning
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int result;
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^
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Make it return -ENODEV here, as in the related failure cases.
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gcc has a known bug in underreporting some of these warnings
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when it has already eliminated the assignment of the return code
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based on some earlier optimization step.
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Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
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Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Acked-by: Miroslav Franc <mfranc@suse.cz>
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---
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drivers/s390/net/ctcm_main.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
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index 7617d21cb296..f63c5c871d3d 100644
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--- a/drivers/s390/net/ctcm_main.c
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+++ b/drivers/s390/net/ctcm_main.c
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@@ -1595,6 +1595,7 @@ static int ctcm_new_device(struct ccwgroup_device *cgdev)
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if (priv->channel[direction] == NULL) {
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if (direction == CTCM_WRITE)
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channel_free(priv->channel[CTCM_READ]);
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+ result = -ENODEV;
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goto out_dev;
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}
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priv->channel[direction]->netdev = dev;
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