[ARM] 5027/1: Fixed random memory corruption on pxa suspend cycle.

Each time a pxa type cpu went in suspend, a portion of
kmalloc memory was corrupted.
The issue was an incorrect length allocation introduced by
the commit 711be5cc for
the save registers array (=> overflow).
Signed-off-by: NRobert Jarzmik <rjarzmik@free.fr>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/pm.c

@@ -42,7 +42,7 @@ int pxa_pm_enter(suspend_state_t state)
 	if (state != PM_SUSPEND_STANDBY) {
 		pxa_cpu_pm_fns->save(sleep_save);
 		/* before sleeping, calculate and save a checksum */
-		for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
+		for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
 			sleep_save_checksum += sleep_save[i];
 	}
 
@@ -55,7 +55,7 @@ int pxa_pm_enter(suspend_state_t state)
 
 	if (state != PM_SUSPEND_STANDBY) {
 		/* after sleeping, validate the checksum */
-		for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
+		for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
 			checksum += sleep_save[i];
 
 		/* if invalid, display message and wait for a hardware reset */
@@ -101,7 +101,8 @@ static int __init pxa_pm_init(void)
 		return -EINVAL;
 	}
 
-	sleep_save = kmalloc(pxa_cpu_pm_fns->save_size, GFP_KERNEL);
+	sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
+			     GFP_KERNEL);
 	if (!sleep_save) {
 		printk(KERN_ERR "failed to alloc memory for pm save\n");
 		return -ENOMEM;

arch/arm/mach-pxa/pxa25x.c

@@ -150,9 +150,7 @@ static struct clk pxa25x_clks[] = {
  * More ones like CP and general purpose register values are preserved
  * with the stack pointer in sleep.S.
  */
-enum {	SLEEP_SAVE_START = 0,
-
-	SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2,
+enum {	SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2,
 
 	SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
 	SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
@@ -162,7 +160,7 @@ enum {	SLEEP_SAVE_START = 0,
 
 	SLEEP_SAVE_CKEN,
 
-	SLEEP_SAVE_SIZE
+	SLEEP_SAVE_COUNT
 };
 
 
@@ -210,7 +208,7 @@ static void pxa25x_cpu_pm_enter(suspend_state_t state)
 }
 
 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
-	.save_size	= SLEEP_SAVE_SIZE,
+	.save_count	= SLEEP_SAVE_COUNT,
 	.valid		= suspend_valid_only_mem,
 	.save		= pxa25x_cpu_pm_save,
 	.restore	= pxa25x_cpu_pm_restore,

arch/arm/mach-pxa/pxa27x.c

@@ -181,9 +181,7 @@ static struct clk pxa27x_clks[] = {
  * More ones like CP and general purpose register values are preserved
  * with the stack pointer in sleep.S.
  */
-enum {	SLEEP_SAVE_START = 0,
-
-	SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2, SLEEP_SAVE_PGSR3,
+enum {	SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2, SLEEP_SAVE_PGSR3,
 
 	SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
 	SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
@@ -198,7 +196,7 @@ enum {	SLEEP_SAVE_START = 0,
 	SLEEP_SAVE_PWER, SLEEP_SAVE_PCFR, SLEEP_SAVE_PRER,
 	SLEEP_SAVE_PFER, SLEEP_SAVE_PKWR,
 
-	SLEEP_SAVE_SIZE
+	SLEEP_SAVE_COUNT
 };
 
 void pxa27x_cpu_pm_save(unsigned long *sleep_save)
@@ -269,7 +267,7 @@ static int pxa27x_cpu_pm_valid(suspend_state_t state)
 }
 
 static struct pxa_cpu_pm_fns pxa27x_cpu_pm_fns = {
-	.save_size	= SLEEP_SAVE_SIZE,
+	.save_count	= SLEEP_SAVE_COUNT,
 	.save		= pxa27x_cpu_pm_save,
 	.restore	= pxa27x_cpu_pm_restore,
 	.valid		= pxa27x_cpu_pm_valid,

arch/arm/mach-pxa/pxa3xx.c

@@ -256,12 +256,11 @@ static unsigned long wakeup_src;
 #define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
 #define RESTORE(x)	x = sleep_save[SLEEP_SAVE_##x]
 
-enum {	SLEEP_SAVE_START = 0,
-	SLEEP_SAVE_CKENA,
+enum {	SLEEP_SAVE_CKENA,
 	SLEEP_SAVE_CKENB,
 	SLEEP_SAVE_ACCR,
 
-	SLEEP_SAVE_SIZE,
+	SLEEP_SAVE_COUNT,
 };
 
 static void pxa3xx_cpu_pm_save(unsigned long *sleep_save)
@@ -376,7 +375,7 @@ static int pxa3xx_cpu_pm_valid(suspend_state_t state)
 }
 
 static struct pxa_cpu_pm_fns pxa3xx_cpu_pm_fns = {
-	.save_size	= SLEEP_SAVE_SIZE,
+	.save_count	= SLEEP_SAVE_COUNT,
 	.save		= pxa3xx_cpu_pm_save,
 	.restore	= pxa3xx_cpu_pm_restore,
 	.valid		= pxa3xx_cpu_pm_valid,

arch/arm/mach-sa1100/pm.c

@@ -43,20 +43,18 @@ extern void sa1100_cpu_resume(void);
  * More ones like CP and general purpose register values are preserved
  * on the stack and then the stack pointer is stored last in sleep.S.
  */
-enum {	SLEEP_SAVE_SP = 0,
-
-	SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
+enum {	SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
 	SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
 
 	SLEEP_SAVE_Ser1SDCR0,
 
-	SLEEP_SAVE_SIZE
+	SLEEP_SAVE_COUNT
 };
 
 
 static int sa11x0_pm_enter(suspend_state_t state)
 {
-	unsigned long gpio, sleep_save[SLEEP_SAVE_SIZE];
+	unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT];
 
 	gpio = GPLR;
 

include/asm-arm/arch-pxa/pm.h

@@ -10,7 +10,7 @@
 #include <linux/suspend.h>
 
 struct pxa_cpu_pm_fns {
-	int	save_size;
+	int	save_count;
 	void	(*save)(unsigned long *);
 	void	(*restore)(unsigned long *);
 	int	(*valid)(suspend_state_t state);