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| author | Maciej Falkowski <maciej.falkowski9@gmail.com> | 2021-04-01 18:11:27 +0200 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2021-05-18 09:44:41 +0300 |
| commit | 3c4e0147c269738a19c7d70cd32395600bcc0714 (patch) | |
| tree | 93218debe159f5d544e9485c0c00e75f6873b6b0 /arch | |
| parent | 6efb943b8616ec53a5e444193dccf1af9ad627b5 (diff) | |
| download | linux-stable-3c4e0147c269738a19c7d70cd32395600bcc0714.tar.gz linux-stable-3c4e0147c269738a19c7d70cd32395600bcc0714.tar.bz2 linux-stable-3c4e0147c269738a19c7d70cd32395600bcc0714.zip | |
ARM: OMAP1: Fix use of possibly uninitialized irq variable
The current control flow of IRQ number assignment to `irq` variable
allows a request of IRQ of unspecified value,
generating a warning under Clang compilation with omap1_defconfig on
linux-next:
arch/arm/mach-omap1/pm.c:656:11: warning: variable 'irq' is used
uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
else if (cpu_is_omap16xx())
^~~~~~~~~~~~~~~~~
./arch/arm/mach-omap1/include/mach/soc.h:123:30: note: expanded from macro
'cpu_is_omap16xx'
^~~~~~~~~~~~~
arch/arm/mach-omap1/pm.c:658:18: note: uninitialized use occurs here
if (request_irq(irq, omap_wakeup_interrupt, 0, "peripheral wakeup",
^~~
arch/arm/mach-omap1/pm.c:656:7: note: remove the 'if' if its condition is
always true
else if (cpu_is_omap16xx())
^~~~~~~~~~~~~~~~~~~~~~
arch/arm/mach-omap1/pm.c:611:9: note: initialize the variable 'irq' to
silence this warning
int irq;
^
= 0
1 warning generated.
The patch provides a default value to the `irq` variable
along with a validity check.
Signed-off-by: Maciej Falkowski <maciej.falkowski9@gmail.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1324
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-omap1/pm.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/arm/mach-omap1/pm.c b/arch/arm/mach-omap1/pm.c index 2c1e2b32b9b3..a745d64d4699 100644 --- a/arch/arm/mach-omap1/pm.c +++ b/arch/arm/mach-omap1/pm.c @@ -655,9 +655,13 @@ static int __init omap_pm_init(void) irq = INT_7XX_WAKE_UP_REQ; else if (cpu_is_omap16xx()) irq = INT_1610_WAKE_UP_REQ; - if (request_irq(irq, omap_wakeup_interrupt, 0, "peripheral wakeup", - NULL)) - pr_err("Failed to request irq %d (peripheral wakeup)\n", irq); + else + irq = -1; + + if (irq >= 0) { + if (request_irq(irq, omap_wakeup_interrupt, 0, "peripheral wakeup", NULL)) + pr_err("Failed to request irq %d (peripheral wakeup)\n", irq); + } /* Program new power ramp-up time * (0 for most boards since we don't lower voltage when in deep sleep) |