The patch titled
drivers/cpuidle: Move dereference after NULL test
has been added to the -mm tree. Its filename is
drivers-cpuidle-move-dereference-after-null-test.patch
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------------------------------------------------------
Subject: drivers/cpuidle: Move dereference after NULL test
From: Julia Lawall <julia@xxxxxxx>
It does not seem possible that ldev can be NULL, so drop the unnecessary
test. If ldev can somehow be NULL, then the initialization of last_idx
should be moved below the test.
A simplified version of the semantic match that detects this problem is as
follows (http://coccinelle.lip6.fr/):
// <smpl>
@match exists@
expression x, E;
identifier fld;
@@
* x->fld
... when != \(x = E\|&x\)
* x == NULL
// </smpl>
Signed-off-by: Julia Lawall <julia@xxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/cpuidle/governors/ladder.c | 3 ---
1 file changed, 3 deletions(-)
diff -puN drivers/cpuidle/governors/ladder.c~drivers-cpuidle-move-dereference-after-null-test drivers/cpuidle/governors/ladder.c
--- a/drivers/cpuidle/governors/ladder.c~drivers-cpuidle-move-dereference-after-null-test
+++ a/drivers/cpuidle/governors/ladder.c
@@ -69,9 +69,6 @@ static int ladder_select_state(struct cp
int last_residency, last_idx = ldev->last_state_idx;
int latency_req = pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY);
- if (unlikely(!ldev))
- return 0;
-
/* Special case when user has set very strict latency requirement */
if (unlikely(latency_req == 0)) {
ladder_do_selection(ldev, last_idx, 0);
_
Patches currently in -mm which might be from julia@xxxxxxx are
origin.patch
linux-next.patch
drivers-scsi-libsas-use-sam_good.patch
drivers-block-dac960c-use-dac960_v2_controller.patch
drivers-char-ipmi-use-kcs_idle_state.patch
drivers-message-move-dereference-after-null-test.patch
drivers-acpi-move-dereference-after-null-test.patch
drivers-media-video-move-dereference-after-null-test.patch
drivers-mmc-move-dereference-after-null-test.patch
drivers-cpuidle-move-dereference-after-null-test.patch
drivers-video-move-dereference-after-null-test.patch
drivers-ata-libata-move-dereference-after-null-test.patch
drivers-scsi-remove-unnecessary-null-test.patch
arch-arm-plat-omap-drop-an-unnecessary-null-test.patch
arch-arm-plat-s3c24xx-move-dereference-after-null-test.patch
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